142 results on '"Wassem, Roseli"'
Search Results
2. Large-Scale Screening of Asymptomatic Persons for SARS-CoV-2 Variants of Concern and Gamma Takeover, Brazil
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Adamoski, Douglas, de Oliveira, Jaqueline Carvalho, Bonatto, Ana Claudia, Wassem, Roseli, Nogueira, Meri Bordignon, Raboni, Sonia Mara, Trindade, Edvaldo da Silva, de Souza, Emanuel Maltempi, and Gradia, Daniela Fiori
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Carrier state (Communicable diseases) -- Statistics -- Diagnosis ,Health - Abstract
Ongoing screening for active severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infections, coupled with contact tracing, can efficiently reduce viral transmission within the community (1). However, as new and more [...]
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- 2021
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3. The Complete Genome Sequence of Chromobacterium violaceum Reveals Remarkable and Exploitable Bacterial Adaptability
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de Almeida, Darcy F., Hungria, Mariangela, Guimarães, Claudia Teixeira, Antônio, Regina Vasconcellos, Almeida, Francisca Cunha, de Almeida, Rosana, Alves-Gomes, José Antonio, Andrade, Elizabeth Mazoni, Araripe, Julia, Astolfi-Filho, Spartaco, Azevedo, Vasco, Baptista, Alessandra Jorge, Beló, André, van den Berg, Cássio, Bogo, Maurício, Bonatto, Sandro, Bordignon, Juliano, Brigido, Marcelo Macedo, Brito, Cristiana Alves, Brocchi, Marcelo, Burity, Helio Almeida, Camargo, Anamaria Aranha, Carneiro, Newton Portilho, Carraro, Dirce Maria, Cavada, Benildo Sousa, Creczynski-Pasa, Tânia Beatriz, da Cunha-Junior, Nivaldo Costa, Fagundes, Nelson, Falcão, Clarissa Lima, Fantinatti, Fabiana, Farias, Izeni Pires, Ferrari, Lilian Pereira, Ferro, Jesus Aparecido, Franco, Gloria Regina, Furlan, Luiz Roberto, Gazzinelli, Ricardo Tostes, Gomes, Eliane Aparecida, Gonçalves, Pablo Rodrigues, Grangeiro, Thalles Barbosa, Grattapaglia, Dario, Grisard, Edmundo Carlos, Hanna, Ebert Seixas, Jardim, Sílvia Neto, Laurino, Jomar, Manfio, Gilson Paulo, Maranhão, Andrea Queiroz, Martins, Wellington Santos, Nicolás, Marisa Fabiana, Oliveira, Jaquelline Germano, Oliveira, Sergio Costa, Parente, Juliana Alves, Pereira, José Odair, Pereira, Maristela, Potrich, Deise Porto, Ramalho-Neto, Cicero Eduardo, Rigo, Liu Um, Rondinelli, Edson, Santos, Fabrício R., Seuanez, Hector N., Silva, Denise Wanderlei, Silva, Rosane, Simon, Daniel, Souza, Emanuel Maltempi, Souza, Rangel Celso, Steindel, Mário, Teixeira, Santuza Ribeiro, Urmenyi, Turan, Vettore, André, Wassem, Roseli, and Zaha, Arnaldo
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- 2003
4. Comparative Genomics of Herbaspirillum Species
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Monteiro, Rose Adele, Cruz, Leonardo Magalhães, Wassem, Roseli, Muller, Marcelo, Cardoso, Rodrigo, de Oliveira Pedrosa, Fábio, Chubatsu, Leda Satie, James, Euan K., de Souza, Emanuel Maltempi, and Katsy, Elena I., editor
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- 2014
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5. Modulation of defence and iron homeostasis genes in rice roots by the diazotrophic endophyte Herbaspirillum seropedicae
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Brusamarello-Santos, Liziane Cristina Campos, Alberton, Dayane, Valdameri, Glaucio, Camilios-Neto, Doumit, Covre, Rafael, Lopes, Katia de Paiva, Zibetti Tadra-Sfeir, Michelle, Faoro, Helisson, Adele Monteiro, Rose, Barbosa-Silva, Adriano, John Broughton, William, Oliveira Pedrosa, Fabio, Wassem, Roseli, and Souza, Emanuel Maltempi de
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- 2019
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6. Comparison of SARS-CoV-2 molecular detection in nasopharyngeal swab, saliva, and gargle samples
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Genelhoud, Gustavo, primary, Adamoski, Douglas, additional, Spalanzani, Regiane Nogueira, additional, Bochnia-Bueno, Lucas, additional, de Oliveira, Jaqueline Carvalho, additional, Gradia, Daniela Fiori, additional, Bonatto, Ana Cláudia, additional, Wassem, Roseli, additional, Raboni, Sonia Mara, additional, Nogueira, Meri Bordignon, additional, and de Araujo-Souza, Patricia Savio, additional
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- 2022
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7. SARS-CoV-2 Delta and Omicron Variants Surge in Curitiba, Southern Brazil, and Its Impact on Overall COVID-19 Lethality
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Adamoski, Douglas, primary, Baura, Valter Antonio de, additional, Rodrigues, Ana Carolina, additional, Royer, Carla Adriane, additional, Aoki, Mateus Nóbrega, additional, Tschá, Marcel Kruchelski, additional, Bonatto, Ana Claudia, additional, Wassem, Roseli, additional, Nogueira, Meri Bordignon, additional, Raboni, Sonia Mara, additional, Almeida, Bernardo Montesanti Machado de, additional, Trindade, Edvaldo da Silva, additional, Gradia, Daniela Fiori, additional, Souza, Emanuel Maltempi, additional, and Carvalho de Oliveira, Jaqueline, additional
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- 2022
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8. Herbaspirillum-plant interactions: microscopical, histological and molecular aspects
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Monteiro, Rose Adele, Balsanelli, Eduardo, Wassem, Roseli, Marin, Anelis M., Brusamarello-Santos, Liziane C. C., Schmidt, Maria Augusta, Tadra-Sfeir, Michelle Z., Pankievicz, Vânia C. S., Cruz, Leonardo M., Chubatsu, Leda S., Pedrosa, Fabio O., and Souza, Emanuel M.
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- 2012
9. Nitrogen fixation control in Herbaspirillum seropedicae
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Chubatsu, Leda Satie, Monteiro, Rose Adele, de Souza, Emanuel Maltempi, de Oliveira, Marco Aurelio Schuler, Yates, Marshall Geoffrey, Wassem, Roseli, Bonatto, Ana Claudia, Huergo, Luciano Fernandes, Steffens, Maria Berenice Reynaud, Rigo, Liu Un, and de Oliveira Pedrosa, Fabio
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- 2012
10. Characterization of glutamine synthetase from the ammonium-excreting strain HM053 of Azospirillum brasilense
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Ghenov, Fernanda, primary, Gerhardt, Edileusa Cristina Marques, additional, Huergo, Luciano Fernandes, additional, Pedrosa, Fabio Oliveira, additional, Wassem, Roseli, additional, and Souza, Emanuel Maltempi, additional
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- 2022
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11. Severe acute respiratory syndrome coronavirus 2 infection among healthcare workers in a tertiary public hospital in Curitiba, Brazil
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Spalanzani, Regiane Nogueira, primary, Genelhoud, Gustavo, additional, Raboni, Sonia Mara, additional, Almeida, Sergio Monteiro de, additional, Pereira, Luciane Aparecida, additional, Rotta, Indianara, additional, Cavalli, Barbara Maria, additional, Moreira, Francielli Brusco, additional, Dino, Carolina Lumi Tanaka, additional, Takahashi, Gislene Reche de Almeida, additional, Cognialli, Regielly Caroline Raimundo, additional, Spiri, Beatriz Sanada, additional, Bochnia-Bueno, Lucas, additional, Oliveira, Jaqueline Carvalho de, additional, Adamoski, Douglas, additional, Gradia, Daniela Fiori, additional, Bonatto, Ana Cláudia, additional, Wassem, Roseli, additional, Alves, Juliana Mazini, additional, Padilha, Raquel da Silva, additional, Brasil, Vitor Jorge Woytuski, additional, Almeida, Bernardo Montesanti Machado de, additional, and Nogueira, Meri Bordignon, additional
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- 2022
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12. Role of conserved cysteine residues in Herbaspirillum seropedicae NifA activity
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Oliveira, Marco A.S., Baura, Valter A., Aquino, Bruno, Huergo, Luciano F., Kadowaki, Marco A.S., Chubatsu, Leda S., Souza, Emanuel M., Dixon, Ray, Pedrosa, Fábio O., Wassem, Roseli, and Monteiro, Rose A.
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- 2009
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13. Characterization of the orf1glnKamtB operon of Herbaspirillum seropedicae
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Noindorf, Lilian, Rego, Fabiane G. M., Baura, Valter A., Monteiro, Rose A., Wassem, Roseli, Cruz, Leonardo M., Rigo, Liu U., Souza, Emanuel M., Steffens, Maria B. R., Pedrosa, Fabio O., and Chubatsu, Leda S.
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- 2006
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14. Genes involved in Sec-independent membrane targeting of hydrogenase in Azotobacter chroococcum
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Maltempi de Souza, Emanuel, de Oliveira Pedrosa, Fábio, Wassem, Roseli, Ford, Chris M., and Yates, M. Geoffrey
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- 2007
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15. Genome-wide Association Studies Reveal Important Candidate Genes for the Bacillus pumilus TUAT-1-Arabidopsis thaliana Interaction
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Cotta, Marina Soneghett, primary, do Amaral, Fernanda Plucani, additional, Cruz, Leonardo Magalhães, additional, Wassem, Roseli, additional, de Oliveira Pedrosa, Fábio, additional, Yokoyama, Tadashi, additional, and Stacey, Gary, additional
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- 2020
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16. TtsI regulates symbiotic genes in Rhizobium species NGR234 by binding to tts boxes
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Wassem, Roseli, Kobayashi, Hajime, Kambara, Kumiko, Le Quéré, Antoine, Walker, Graham C., Broughton, William J., and Deakin, William J.
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- 2008
17. The expression of nifB gene from Herbaspirillum seropedicae is dependent upon the NifA and RpoN proteins
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Rego, Fabiane G.M., Pedrosa, Fábio O, Chubatsu, Leda S., Yates, M Geoffrey, Wassem, Roseli, Steffens, Maria B.R., Rigo, Liu U., and Souza, Emanuel M.
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- 2006
18. Two roles for integration host factor at an enhancer-dependent nifA promoter
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Wassem, Roseli, de Souza, Emanuel Maltempi, Yates, Marshall Geoffrey, de Oliveira Pedrosa, Fábio, and Buck, Martin
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- 2000
19. The type III secretion system is necessary for the development of a pathogenic and endophytic interaction between Herbaspirillum rubrisubalbicans and Poaceae
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Schmidt Maria, Balsanelli Eduardo, Faoro Hellison, Cruz Leonardo M, Wassem Roseli, de Baura Valter A, Weiss Vinícius, Yates Marshall G, Madeira Humberto M F, Pereira-Ferrari Lilian, Fungaro Maria H P, de Paula Francine M, Pereira Luiz F P, Vieira Luiz G E, Olivares Fábio L, Pedrosa Fábio O, de Souza Emanuel M, and Monteiro Rose A
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Microbiology ,QR1-502 - Abstract
Abstract Background Herbaspirillum rubrisubalbicans was first identified as a bacterial plant pathogen, causing the mottled stripe disease in sugarcane. H. rubrisubalbicans can also associate with various plants of economic interest in a non pathogenic manner. Results A 21 kb DNA region of the H. rubrisubalbicans genome contains a cluster of 26 hrp/hrc genes encoding for the type three secretion system (T3SS) proteins. To investigate the contribution of T3SS to the plant-bacterial interaction process we generated mutant strains of H. rubrisubalbicans M1 carrying a Tn5 insertion in both the hrcN and hrpE genes. H. rubrisulbalbicans hrpE and hrcN mutant strains of the T3SS system failed to cause the mottled stripe disease in the sugarcane susceptible variety B-4362. These mutant strains also did not produce lesions on Vigna unguiculata leaves. Oryza sativa and Zea mays colonization experiments showed that mutations in hrpE and hrcN genes reduced the capacity of H. rubrisulbalbicans to colonize these plants, suggesting that hrpE and hrcN genes are involved in the endophytic colonization. Conclusions Our results indicate that the T3SS of H. rubrisubalbicans is necessary for the development of the mottled stripe disease and endophytic colonization of rice.
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- 2012
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20. Unveiling the Diversity of Immunoglobulin Heavy Constant Gamma (IGHG) Gene Segments in Brazilian Populations Reveals 28 Novel Alleles and Evidence of Gene Conversion and Natural Selection
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Calonga-Solís, Verónica, primary, Malheiros, Danielle, additional, Beltrame, Marcia Holsbach, additional, Vargas, Luciana de Brito, additional, Dourado, Renata Montoro, additional, Issler, Hellen Caroline, additional, Wassem, Roseli, additional, Petzl-Erler, Maria Luiza, additional, and Augusto, Danillo G., additional
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- 2019
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21. The NtrY-NtrX two-component system is involved in controlling nitrate assimilation inHerbaspirillum seropedicaestrain SmR1
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Bonato, Paloma, primary, Alves, Lysangela R., additional, Osaki, Juliana H., additional, Rigo, Liu U., additional, Pedrosa, Fabio O., additional, Souza, Emanuel M., additional, Zhang, Nan, additional, Schumacher, Jörg, additional, Buck, Martin, additional, Wassem, Roseli, additional, and Chubatsu, Leda S., additional
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- 2016
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22. The complete genome sequence ofChromobacterium violaceumreveals remarkable and exploitable bacterial adaptability
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Vasconcelos, Ana Tereza, De-Almeida, Darcy Fontoura, Hungría, Mariangela, Guimarães, Cláudia Teixeira, Antônio, Regina Vasconcellos, Almeida, Francisca Cunha, Almeida, Luiz G.P., Almeida, Rosana G. de, Alves-Gomes, José Antônio, Andrade, Elizabeth Mazoni, Araripe, Júlia Rolão, Araújo, Magnólia Fernandes Florêncio de, Astolfi-Filho, Spártaco A.T., Azevedo, Vasco Ariston Carvalho, Baptista, Alessandra Jorge, Bataus, Luiz Artur Mendes, Batista, Jacqueline da Silva, Beló, André, Van Den Berg, Cássio, Bogo, Maurício Reis, Bonatto, Sandro L., Bordignon, Juliano, Brígido, Marcelo Macedo, Brito, Cristiana Ferreira Alves de, Brocchi, Marcelo, Burity, Hélio Almeida, Camargo, Anamaria A., Cardoso, Divina das Dôres de Paula, Carneiro, Newton Portilho, Carraro, Dirce Maria, Carvalho, Cláudia Márcia Benedetto, Mattos Cascardo, Júlio Cézar de, Cavada, B. S., Chueire, Lígia Maria Oliveira, Creczynski-Pasa, Tânia Beatriz, Cunha, Nivaldo Costa da, Fagundes, Nelson Jurandi Rosa, Falcão, Clarissa Lima, Fantinatti, Fabiana, Farias, Izeni P., Felipe, Maria Sueli Soares, Ferrari, Lilian Pereira, Ferro, Jesus Aparecido, Ferro, Maria Inês Tiraboschi, Franco, Glória Regina, Freitas, Nara Suzy Aguiar de, Furlan, Luiz Roberto, Gazzinelli, Ricardo Tostes Ostes, Gomes, Eliane Aparecida, Gonçalves, Pablo Rodrigues, Grangeiro, Thalles Barbosa, Grattapaglia, Dario, Grisard, Edmundo Carlos, Hanna, Ebert Seixas, Jardim, Sílvia Neto, Laurino, Jomar Pereira, Leoi, Lélia C.T., Agnez-Lima, Lucymara Fassarella, FÁtima Loureiro, Maria de, Lyra, Maria do Carmo Catanho Pereira de, Madeira, Humberto Maciel França, Manfio, Gilson Paulo, Queiroz Maranhão, Andrea, Martins, Wellington Santos, Zingaretti, Sônia M., Batistuzzo de Medeiros, Sìlvia Regina, Vasconcellos Meissner, Rosely de, Moreira, Miguel Ångelo Martins, Nascimento, Fabrícia F., Nicolás, Marisa Fabiana, Oliveira, Jaquelline Germano, Oliveira, Sérgio Costa, Paixão, Roger Ferreira Cury, Parente, Juliana Alves, Pedrosa, Fabio O., Pena, Sergio Danilo Junho, Pereira, José Odair, Pereira, Maristela, Pinto, Luciana Santos Rodrigues Costa, Pinto, Luciano Silva da, Porto, Jorge Ivan Rebelo, Potrich, Deise Porto, Ramalho-Neto, Cícero Eduardo, Reis, Alessandra Maria Moreira, Rigo, Liu Un, Rondinelli, Edson, do Santos, Elen Bethleen Pedraça, Santos, Fabrício Rodrigues dos, Schneider, Maria Paula Cruz, Seuánez, Héctor Nicolás, Silva, Ana Maria Rodrigues, Silva, Artur, Silva, Denise Wanderlei, Silva, Rosane A., Carmo Simões, Isabella de, Simon, Daniel, Almeida Soares, Célia Maria A. de, Soares, Renata de Bastos Ascenço, Souza, Emanuel Maltempi de, Lobo de Souza, Kelly Rose, Souza, Rangel Celso, Steffens, Maria Berenice Reynaud, Steindel, Mário R., Teixeira, Santuza Ribeiro, Ürményi, Turán Péter, Vettore, Andre Luiz, Wassem, Roseli, Zaha, Arnaldo, and Simpson, Andrew John George
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Paraquat ,Gene Sequence ,media_common.quotation_subject ,Molecular Sequence Data ,Bacterial Protein ,BIOLOGIA CELULAR ,Negibacteria ,Bacterial genome size ,Biology ,Stress ,Bacterial Enzyme ,Adaptability ,Open Reading Frame ,Bacterial protein ,Heavy Metal ,Open Reading Frames ,Chromobacterium ,Pathogenicity ,Xenobiotic Metabolism ,Adaptation ,Bacteria (microorganisms) ,media_common ,Whole genome sequencing ,Genetics ,Multidisciplinary ,Chitinase ,Nucleotide Sequence ,Nucleic acid sequence ,Biological Sciences ,Nonhuman ,biology.organism_classification ,Adaptation, Physiological ,Cell Motility ,Prokaryota ,Membrane Transport ,Mammalia ,Priority Journal ,Carrier Protein ,Chromobacterium Violaceum ,Detoxification ,Energy Metabolism ,Chromobacterium violaceum ,Genome, Bacterial ,Biotechnology ,Signal Transduction - Abstract
Chromobacterium violaceumis one of millions of species of free-living microorganisms that populate the soil and water in the extant areas of tropical biodiversity around the world. Its complete genome sequence reveals (i) extensive alternative pathways for energy generation, (ii) ≈500 ORFs for transport-related proteins, (iii) complex and extensive systems for stress adaptation and motility, and (iv) widespread utilization of quorum sensing for control of inducible systems, all of which underpin the versatility and adaptability of the organism. The genome also contains extensive but incomplete arrays of ORFs coding for proteins associated with mammalian pathogenicity, possibly involved in the occasional but often fatal cases of humanC. violaceuminfection. There is, in addition, a series of previously unknown but important enzymes and secondary metabolites including paraquat-inducible proteins, drug and heavy-metal-resistance proteins, multiple chitinases, and proteins for the detoxification of xenobiotics that may have biotechnological applications.
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- 2003
23. RNA-seq analyses reveal insights into the function of respiratory nitrate reductase of the diazotrophHerbaspirillum seropedicae
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Bonato, Paloma, primary, Batista, Marcelo B., additional, Camilios-Neto, Doumit, additional, Pankievicz, Vânia C. S., additional, Tadra-Sfeir, Michelle Z., additional, Monteiro, Rose Adele, additional, Pedrosa, Fabio O., additional, Souza, Emanuel M., additional, Chubatsu, Leda S., additional, Wassem, Roseli, additional, and Rigo, Liu Un, additional
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- 2016
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24. Genetic and functional characterization of a novel meta-pathway for degradation of naringenin inHerbaspirillum seropedicaeSmR1
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Maria Marin, Anelis, primary, de la Torre, Jésus, additional, Ricardo Marques Oliveira, Alfredo, additional, Barison, Andersson, additional, Satie Chubatsu, Leda, additional, Adele Monteiro, Rose, additional, de Oliveira Pedrosa, Fabio, additional, Maltempi de Souza, Emanuel, additional, Wassem, Roseli, additional, Duque, Estrella, additional, and Ramos, Juan-Luis, additional
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- 2016
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25. Genome wide transcriptional profiling of Herbaspirillum seropedicae SmR1 grown in the presence of naringenin
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Tadra-Sfeir, Michelle Z., primary, Faoro, Helisson, additional, Camilios-Neto, Doumit, additional, Brusamarello-Santos, Liziane, additional, Balsanelli, Eduardo, additional, Weiss, Vinicius, additional, Baura, Valter A., additional, Wassem, Roseli, additional, Cruz, Leonardo M., additional, De Oliveira Pedrosa, Fábio, additional, Souza, Emanuel M., additional, and Monteiro, Rose A., additional
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- 2015
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26. Enhanced oxygen consumption in Herbaspirillum seropedicae fnr mutants leads to increased NifA mediated transcriptional activation
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Batista, Marcelo Bueno, primary, Wassem, Roseli, additional, de Oliveira Pedrosa, Fábio, additional, de Souza, Emanuel Maltempi, additional, Dixon, Ray, additional, and Monteiro, Rose Adele, additional
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- 2015
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27. Use of nitrogen-fixing bacteria to improve agricultural productivity
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Souza, Emanuel Maltempi, primary, Chubatsu, Leda Satie, additional, Huergo, Luciano F, additional, Monteiro, Rose, additional, Camilios-Neto, Doumit, additional, Wassem, Roseli, additional, and de Oliveira Pedrosa, Fábio, additional
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- 2014
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28. Genetic and functional characterization of a novel meta-pathway for degradation of naringenin in Herbaspirillum seropedicae SmR1.
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Maria Marin, Anelis, de la Torre, Jésus, Ricardo Marques Oliveira, Alfredo, Barison, Andersson, Satie Chubatsu, Leda, Adele Monteiro, Rose, de Oliveira Pedrosa, Fabio, Maltempi de Souza, Emanuel, Wassem, Roseli, Duque, Estrella, and Ramos, Juan ‐ Luis
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TRANSPOSONS ,NARINGENIN ,MICROBIAL cultures ,MICROBIAL proteins ,SITE-specific mutagenesis ,LIQUID chromatography-mass spectrometry ,MICROORGANISMS - Abstract
In this study, a random mutant library of Herbaspirillum seropedicae SmR1 was constructed by Tn 5 insertion and a mutant incapable of utilizing naringenin as a carbon source was isolated. The Tn 5 transposon was found to be inserted in the fdeE gene (Hsero_1007), which encodes a monooxygenase. Two other mutant strains in fdeC (Hsero_1005) and fdeG (Hsero_1009) genes coding for a dioxygenase and a putative cyclase, respectively, were obtained by site-directed mutagenesis and then characterized. Liquid Chromatography coupled to mass spectrometry (LC-MS)/MS analyses of culture supernatant from the fdeE mutant strain revealed that naringenin remained unaltered, suggesting that the FdeE protein is involved in the initial step of naringenin degradation. LC-MS/MS analyses of culture supernatants from the wild-type (SmR1) and FdeC deficient mutant suggested that in H. seropedicae SmR1 naringenin is first mono-oxygenated by the FdeE protein, to produce 5,7,8-trihydroxy-2-(4-hydroxyphenyl)−2,3-dihydro-4 H-chromen-4-one, that is subsequently dioxygenated and cleaved at the A-ring by the FdeC dioxygenase, since the latter compound accumulated in the fdeC strain. After meta-cleavage of the A-ring, the subsequent metabolic steps generate oxaloacetic acid that is metabolized via the tricarboxylic acid cycle. This bacterium can also modify naringenin by attaching a glycosyl group to the B-ring or a methoxy group to the A-ring, leading to the generation of dead-end products. [ABSTRACT FROM AUTHOR]
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- 2016
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29. The NtrY-NtrX two-component system is involved in controlling nitrate assimilation in Herbaspirillum seropedicae strain SmR1.
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Bonato, Paloma, Alves, Lysangela R., Osaki, Juliana H., Rigo, Liu U., Pedrosa, Fabio O., Souza, Emanuel M., Zhang, Nan, Schumacher, Jörg, Buck, Martin, Wassem, Roseli, and Chubatsu, Leda S.
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NITROGEN metabolism ,NUCLEOTIDE sequencing ,HISTIDINE kinases ,METHYLTRANSFERASES ,NITROGEN fixation ,GENETIC code - Abstract
Herbaspirillum seropedicae is a diazotrophic β-Proteobacterium found endophytically associated with gramineae (Poaceae or graminaceous plants) such as rice, sorghum and sugar cane. In this work we show that nitrate-dependent growth in this organism is regulated by the master nitrogen regulatory two-component system NtrB-NtrC, and by NtrY-NtrX, which functions to specifically regulate nitrate metabolism. NtrY is a histidine kinase sensor protein predicted to be associated with the membrane and NtrX is the response regulator partner. The ntrYntrX genes are widely distributed in Proteobacteria. In α-Proteobacteria they are frequently located downstream from ntr BC, whereas in β-Proteobacteria these genes are located downstream from genes encoding an RNA methyltransferase and a proline-rich protein with unknown function. The NtrX protein of α-Proteobacteria has an AAA+ domain, absent in those from β-Proteobacteria. An ntrY mutant of H. seropedicae showed the wild-type nitrogen fixation phenotype, but the nitrate-dependent growth was abolished. Gene fusion assays indicated that NtrY is involved in the expression of genes coding for the assimilatory nitrate reductase as well as the nitrate-responsive two-component system NarX-NarL ( narK and narX promoters, respectively). The purified NtrX protein was capable of binding the narK and narX promoters, and the binding site at the narX promoter for the NtrX protein was determined by DNA footprinting. In silico analyses revealed similar sequences in other promoter regions of H. seropedicae that are related to nitrate assimilation, supporting the role of the NtrY-NtrX system in regulating nitrate metabolism in H. seropedicae. [ABSTRACT FROM AUTHOR]
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- 2016
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30. Dual RNA-seq transcriptional analysis of wheat roots colonized by Azospirillum brasilense reveals up-regulation of nutrient acquisition and cell cycle genes
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Camilios-Neto, Doumit, primary, Bonato, Paloma, additional, Wassem, Roseli, additional, Tadra-Sfeir, Michelle Z, additional, Brusamarello-Santos, Liziane CC, additional, Valdameri, Glaucio, additional, Donatti, Lucélia, additional, Faoro, Helisson, additional, Weiss, Vinicius A, additional, Chubatsu, Leda S, additional, Pedrosa, Fábio O, additional, and Souza, Emanuel M, additional
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- 2014
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31. The Herbaspirillum seropedicae SmR1 Fnr orthologs controls the cytochrome composition of the electron transport chain
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Batista, Marcelo B., primary, Sfeir, Michelle Z. T., additional, Faoro, Helisson, additional, Wassem, Roseli, additional, Steffens, Maria B. R., additional, Pedrosa, Fábio O., additional, Souza, Emanuel M., additional, Dixon, Ray, additional, and Monteiro, Rose A., additional
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- 2013
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32. RNA-seq analyses reveal insights into the function of respiratory nitrate reductase of the diazotroph Herbaspirillum seropedicae.
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Bonato, Paloma, Batista, Marcelo B., Camilios ‐ Neto, Doumit, Pankievicz, Vânia C. S., Tadra ‐ Sfeir, Michelle Z., Monteiro, Rose Adele, Pedrosa, Fabio O., Souza, Emanuel M., Chubatsu, Leda S., Wassem, Roseli, and Rigo, Liu Un
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RNA sequencing ,NITRATE reductase ,NITROGEN-fixing bacteria ,PLANT roots ,PLANT genomes - Abstract
Herbaspirillum seropedicae is a nitrogen-fixing β-proteobacterium that associates with roots of gramineous plants. In silico analyses revealed that H. seropedicae genome has genes encoding a putative respiratory (NAR) and an assimilatory nitrate reductase (NAS). To date, little is known about nitrate metabolism in H. seropedicae, and, as this bacterium cannot respire nitrate, the function of NAR remains unknown. This study aimed to investigate the function of NAR in H. seropedicae and how it metabolizes nitrate in a low aerated-condition. RNA-seq transcriptional profiling in the presence of nitrate allowed us to pinpoint genes important for nitrate metabolism in H. seropedicae, including nitrate transporters and regulatory proteins. Additionally, both RNA-seq data and physiological characterization of a mutant in the catalytic subunit of NAR ( narG mutant) showed that NAR is not required for nitrate assimilation but is required for: (i) production of high levels of nitrite, (ii) production of NO and (iii) dissipation of redox power, which in turn lead to an increase in carbon consumption. In addition, wheat plants showed an increase in shoot dry weight only when inoculated with H. seropedicae wild type, but not with the narG mutant, suggesting that NAR is important to H. seropedicae-wheat interaction. [ABSTRACT FROM AUTHOR]
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- 2016
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33. Draft Genome Sequence of Herbaspirillum lusitanum P6-12, an Endophyte Isolated from Root Nodules of Phaseolus vulgaris
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Weiss, Vinícius Almir, primary, Faoro, Helisson, additional, Tadra-Sfeir, Michelle Zibbetti, additional, Raittz, Roberto Tadeu, additional, de Souza, Emanuel Maltempi, additional, Monteiro, Rose Adele, additional, Cardoso, Rodrigo Luis Alves, additional, Wassem, Roseli, additional, Chubatsu, Leda Satie, additional, Huergo, Luciano Fernandes, additional, Müller-Santos, Marcelo, additional, Steffens, Maria Berenice Reynaud, additional, Rigo, Liu Un, additional, Pedrosa, Fábio de Oliveira, additional, and Cruz, Leonardo Magalhães, additional
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- 2012
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34. Genomic comparison of the endophyte Herbaspirillum seropedicaeSmR1 and the phytopathogen Herbaspirillum rubrisubalbicansM1 by suppressive subtractive hybridization and partial genome sequencing
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Monteiro, Rose A., primary, Balsanelli, Eduardo, additional, Tuleski, Thalita, additional, Faoro, Helison, additional, Cruz, Leonardo M., additional, Wassem, Roseli, additional, Baura, Valter A., additional, Tadra-Sfeir, Michelle Z., additional, Weiss, Vinícius, additional, DaRocha, Wanderson D., additional, Muller-Santos, Marcelo, additional, Chubatsu, Leda S., additional, Huergo, Luciano F., additional, Pedrosa, Fábio O., additional, and Souza, Emanuel M., additional
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- 2012
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35. CD80 and CD86 polymorphisms in populations of various ancestries: 5 new CD80 promoter alleles
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Beltrame, Márcia Holsbach, primary, Pincerati, Márcia Regina, additional, Dalla-Costa, Ricardo, additional, Wassem, Roseli, additional, Köhler, Karen Francine, additional, Chautard-Freire-Maia, Eleidi Alice, additional, Tsuneto, Luiza Tamie, additional, and Petzl-Erler, Maria Luiza, additional
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- 2012
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36. Genome of Herbaspirillum seropedicae Strain SmR1, a Specialized Diazotrophic Endophyte of Tropical Grasses
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Pedrosa, Fábio O., primary, Monteiro, Rose Adele, additional, Wassem, Roseli, additional, Cruz, Leonardo M., additional, Ayub, Ricardo A., additional, Colauto, Nelson B., additional, Fernandez, Maria Aparecida, additional, Fungaro, Maria Helena P., additional, Grisard, Edmundo C., additional, Hungria, Mariangela, additional, Madeira, Humberto M. F., additional, Nodari, Rubens O., additional, Osaku, Clarice A., additional, Petzl-Erler, Maria Luiza, additional, Terenzi, Hernán, additional, Vieira, Luiz G. E., additional, Steffens, Maria Berenice R., additional, Weiss, Vinicius A., additional, Pereira, Luiz F. P., additional, Almeida, Marina I. M., additional, Alves, Lysangela R., additional, Marin, Anelis, additional, Araujo, Luiza Maria, additional, Balsanelli, Eduardo, additional, Baura, Valter A., additional, Chubatsu, Leda S., additional, Faoro, Helisson, additional, Favetti, Augusto, additional, Friedermann, Geraldo, additional, Glienke, Chirlei, additional, Karp, Susan, additional, Kava-Cordeiro, Vanessa, additional, Raittz, Roberto T., additional, Ramos, Humberto J. O., additional, Ribeiro, Enilze Maria S. F., additional, Rigo, Liu Un, additional, Rocha, Saul N., additional, Schwab, Stefan, additional, Silva, Anilda G., additional, Souza, Eliel M., additional, Tadra-Sfeir, Michelle Z., additional, Torres, Rodrigo A., additional, Dabul, Audrei N. G., additional, Soares, Maria Albertina M., additional, Gasques, Luciano S., additional, Gimenes, Ciela C. T., additional, Valle, Juliana S., additional, Ciferri, Ricardo R., additional, Correa, Luiz C., additional, Murace, Norma K., additional, Pamphile, João A., additional, Patussi, Eliana Valéria, additional, Prioli, Alberto J., additional, Prioli, Sonia Maria A., additional, Rocha, Carmem Lúcia M. S. C., additional, Arantes, Olívia Márcia N., additional, Furlaneto, Márcia Cristina, additional, Godoy, Leandro P., additional, Oliveira, Carlos E. C., additional, Satori, Daniele, additional, Vilas-Boas, Laurival A., additional, Watanabe, Maria Angélica E., additional, Dambros, Bibiana Paula, additional, Guerra, Miguel P., additional, Mathioni, Sandra Marisa, additional, Santos, Karine Louise, additional, Steindel, Mario, additional, Vernal, Javier, additional, Barcellos, Fernando G., additional, Campo, Rubens J., additional, Chueire, Ligia Maria O., additional, Nicolás, Marisa Fabiana, additional, Pereira-Ferrari, Lilian, additional, da Conceição Silva, José L., additional, Gioppo, Nereida M. R., additional, Margarido, Vladimir P., additional, Menck-Soares, Maria Amélia, additional, Pinto, Fabiana Gisele S., additional, Simão, Rita de Cássia G., additional, Takahashi, Elizabete K., additional, Yates, Marshall G., additional, and Souza, Emanuel M., additional
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- 2011
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37. Structural organization of the glnBA region of the Azospirillum brasilense genome
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Castellen, Patrícia, primary, Wassem, Roseli, additional, Monteiro, Rose Adele, additional, Cruz, Leonardo Magalhães, additional, Steffens, Maria Berenice R., additional, Chubatsu, Leda S., additional, Maltempi de Souza, Emanuel, additional, and Pedrosa, Fabio de Oliveira, additional
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- 2009
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38. Early colonization pattern of maize (Zea mays L. Poales, Poaceae) roots by Herbaspirillum seropedicae (Burkholderiales, Oxalobacteraceae)
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Monteiro, Rose A., primary, Schmidt, Maria A., additional, Baura, Valter A. de, additional, Balsanelli, Eduardo, additional, Wassem, Roseli, additional, Yates, Marshall G., additional, Randi, Marco A.F., additional, Pedrosa, Fábio O., additional, and Souza, Emanuel M. de, additional
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- 2008
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39. The expression ofnifBgene fromHerbaspirillum seropedicaeis dependent upon the NifA and RpoN proteins
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Rego, Fabiane G.M, primary, Pedrosa, Fábio O, additional, Chubatsu, Leda S, additional, Yates, M Geoffrey, additional, Wassem, Roseli, additional, Steffens, Maria B.R, additional, Rigo, Liu U, additional, and Souza, Emanuel M, additional
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- 2006
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40. Characterization of the orf1glnKamtB operon of Herbaspirillum seropedicae
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Noindorf, Lilian, primary, Rego, Fabiane G. M., additional, Baura, Valter A., additional, Monteiro, Rose A., additional, Wassem, Roseli, additional, Cruz, Leonardo M., additional, Rigo, Liu U., additional, Souza, Emanuel M., additional, Steffens, Maria B. R., additional, Pedrosa, Fabio O., additional, and Chubatsu, Leda S., additional
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- 2005
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41. Control of autogenous activation ofHerbaspirillum seropedicae nifApromoter by the IHF protein
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Wassem, Roseli, primary, Pedrosa, Fábio O, additional, Yates, Marshall G, additional, Rego, Fabiane G.M, additional, Chubatsu, Leda S, additional, Rigo, Liu U, additional, and Souza, Emanuel M, additional
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- 2002
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42. Inter-domain cross-talk controls the NifA protein activity ofHerbaspirillum seropedicae
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Monteiro, Rose A., primary, de Souza, Emanuel M., additional, Wassem, Roseli, additional, Yates, M.Geoffrey, additional, Pedrosa, Fabio O., additional, and Chubatsu, Leda S., additional
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- 2001
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43. Genomic comparison of the endophyte Herbaspirillum seropedicae Sm R1 and the phytopathogen Herbaspirillum rubrisubalbicans M1 by suppressive subtractive hybridization and partial genome sequencing.
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Monteiro, Rose A., Balsanelli, Eduardo, Tuleski, Thalita, Faoro, Helison, Cruz, Leonardo M., Wassem, Roseli, Baura, Valter A., Tadra-Sfeir, Michelle Z., Weiss, Vinícius, DaRocha, Wanderson D., Muller-Santos, Marcelo, Chubatsu, Leda S., Huergo, Luciano F., Pedrosa, Fábio O., and Souza, Emanuel M.
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ENDOPHYTES ,PHYTOPATHOGENIC microorganisms ,NUCLEIC acid hybridization ,NUCLEOTIDE sequence ,SUGARCANE diseases & pests ,SYMPTOMS ,LIPOPOLYSACCHARIDES - Abstract
Herbaspirillum rubrisubalbicans M1 causes the mottled stripe disease in sugarcane cv. B-4362. Inoculation of this cultivar with Herbaspirillum seropedicae Sm R1 does not produce disease symptoms. A comparison of the genomic sequences of these closely related species may permit a better understanding of contrasting phenotype such as endophytic association and pathogenic life style. To achieve this goal, we constructed suppressive subtractive hybridization ( SSH) libraries to identify DNA fragments present in one species and absent in the other. In a parallel approach, partial genomic sequence from H. rubrisubalbicans M1 was directly compared in silico with the H. seropedicae Sm R1 genome. The genomic differences between the two organisms revealed by SSH suggested that lipopolysaccharide and adhesins are potential molecular factors involved in the different phenotypic behavior. The cluster wss probably involved in cellulose biosynthesis was found in H. rubrisubalbicans M1. Expression of this gene cluster was increased in H. rubrisubalbicans M1 cells attached to the surface of maize root, and knockout of wssD gene led to decrease in maize root surface attachment and endophytic colonization. The production of cellulose could be responsible for the maize attachment pattern of H. rubrisubalbicans M1 that is capable of outcompeting H. seropedicae Sm R1. [ABSTRACT FROM AUTHOR]
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- 2012
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44. The type III secretion system is necessary for the development of a pathogenic and endophytic interaction between Herbaspirillum rubrisubalbicans and Poaceae.
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Augusta Schmidt, Maria, Balsanelli, Eduardo, Faoro, Hellison, Cruz, Leonardo M., Wassem, Roseli, de Baura, Valter A., Weiss, Vinícius, Yates, Marshall G., Madeira, Humberto M. F., Pereira-Ferrari, Lilian, Fungaro, Maria H. P., de Paula, Francine M., Pereira, Luiz F. P., Vieira, Luiz G. E., Olivares, Fábio L., Pedrosa, Fâbio O., de Souza, Emanuel M., and Monteiro, Rose A.
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PLANT diseases ,SUGARCANE ,SUGAR crops ,NUCLEIC acids ,ORYZA - Abstract
Background: Herbaspirillum rubrisubalbicans was first identified as a bacterial plant pathogen, causing the mottled stripe disease in sugarcane. H. rubrisubalbicans can also associate with various plants of economic interest in a non pathogenic manner. Results: A 21 kb DNA region of the H. rubrisubalbicans genome contains a cluster of 26 hrp/hrc genes encoding for the type three secretion system (T3SS) proteins. To investigate the contribution of T3SS to the plant-bacterial interaction process we generated mutant strains of H. rubrisubalbicans M1 carrying a Tn5 insertion in both the hrcN and hrpE genes. H. rubrisulbalbicans hrpE and hrcN mutant strains of the T3SS system failed to cause the mottled stripe disease in the sugarcane susceptible variety B-4362. These mutant strains also did not produce lesions on Vigna unguiculata leaves. Oryza sativa and Zea mays colonization experiments showed that mutations in hrpE and hrcN genes reduced the capacity of H. rubrisulbalbicans to colonize these plants, suggesting that hrpE and hrcN genes are involved in the endophytic colonization. Conclusions: Our results indicate that the T3SS of H. rubrisubalbicans is necessary for the development of the mottled stripe disease and endophytic colonization of rice. [ABSTRACT FROM AUTHOR]
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- 2012
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45. Control of autogenous activation of Herbaspirillum seropedicae nifA promoter by the IHF protein
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Wassem, Roseli, Pedrosa, Fábio O., Yates, Marshall G., Rego, Fabiane G.M., Chubatsu, Leda S., Rigo, Liu U., and Souza, Emanuel M.
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NITROGEN fixation , *ESCHERICHIA coli - Abstract
Analysis of the expression of the Herbaspirillum seropedicae nifA promoter in Escherichia coli and Herbaspirillum seropedicae, showed that nifA expression is primarily dependent on NtrC but also required NifA for maximal expression under nitrogen-fixing conditions. Deletion of the IHF (integration host factor)-binding site produced a promoter with two-fold higher activity than the native promoter in the H. seropedicae wild-type strain but not in a nifA strain, indicating that IHF controls NifA auto-activation. IHF is apparently required to prevent overexpression of the NifA protein via auto-activation under nitrogen-fixing conditions in H. seropedicae. [Copyright &y& Elsevier]
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- 2002
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46. Inter‐domain cross‐talk controls the NifA protein activity of Herbaspirillum seropedicae
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Monteiro, Rose A., de Souza, Emanuel M., Wassem, Roseli, Yates, M.Geoffrey, Pedrosa, Fabio O., and Chubatsu, Leda S.
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Herbaspirillum seropedicaeis an endophytic diazotroph, which colonizes sugar cane, wheat, rice and maize. The activity of NifA, a transcriptional activator of nifgenes in H. seropedicae, is controlled by ammonium ions through a mechanism involving its N‐terminal domain. Here we show that this domain interacts specifically in vitro with the N‐truncated NifA protein, as revealed by protection against proteolysis, and this interaction caused an inhibitory effect on both the ATPase and DNA‐binding activities of the N‐truncated NifA protein. We suggest that the N‐terminal domain inhibits NifA‐dependent transcriptional activation by an inter‐domain cross‐talk between the catalytic domain of the NifA protein and its regulatory N‐terminal domain in response to fixed nitrogen.
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- 2001
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47. Identificação de genes de Phaseolus vulgaris envolvidos na resposta a proteínas de nodulação (NOPS) de Sinorhizobium fredii NGR234
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Barbosa, Luana Tavares, 1987, Wassem, Roseli, 1972, Universidade Federal do Paraná. Setor de Ciências Biológicas. Programa de Pós-Graduação em Genética, and Bonatto, Ana Claudia, 1978
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Nitrogênio - Fixação ,Genética ,Feijão - Abstract
Orientadora: Profª. Drª. Ana Claudia Bonatto Coorientadora: Profª. Drª. Roseli Wassem Tese (doutorado) - Universidade Federal do Paraná, Setor de Ciências Biológicas, Programa de Pós-Graduação em Genética. Defesa : Curitiba, 28/11/2019 Inclui referências Resumo: A fixação biológica de nitrogênio é o processo onde ocorre a conversão de nitrogênio gasoso em amônia através da atividade do complexo enzimático da nitrogenase presente em bactérias diazotróficas. Sinorhizobium fredii NGR234 é uma bactéria capaz de fixar nitrogênio no interior de estruturas conhecidas como nódulos, e apresenta um sistema de secreção tipo III que secreta cinco proteínas efetoras (NopM, NopJ, NopT, NopP e NopL). Estas proteínas provocam modificações na célula vegetal e determinam a eficiência de nodulação de diferentes maneiras dependendo da planta hospedeira. Phaseolus vulgaris (feijão comum) é uma leguminosa com grande importância na alimentação nos países da América Latina e África. O feijão pode se associar a S. fredii NGR234 e formar nódulos na raiz, onde ocorre a fixação de nitrogênio. Nesta associação, o sistema de secreção de S. fredii NGR234 tem efeito negativo na nodulação de P. vulgaris. O processo de nodulação depende do reconhecimento planta-bactéria e envolve uma cascata com várias etapas, incluindo a secreção de flavonóides pelas raízes da planta e a produção de fatores Nod, polissacarídeos e proteínas efetoras (Nops) pela bactéria. Pouco se conhece sobre os aspectos moleculares do reconhecimento das proteínas Nops pela da planta. Assim, este trabalho teve como objetivo identificar os genes de P. vulgaris diferencialmente expressos em resposta aos Nops de S. fredii NGR234, como também as vias metabólicas em que eles estão envolvidos. Para tanto, o transcriptoma de P. vulgaris inoculado com as estirpes selvagem NGR234 e mutantes nopM-, nopJ- e rhcN- foi analisado. As amostras de RNA foram obtidas em duas fases de desenvolvimento do nódulo, com 10 dias (primórdio) e 21 dias (nódulo). As bibliotecas de cDNA foram sequenciadas, os reads gerados foram mapeados no genoma de P. vulgaris e os genes foram comparados entre as condições testadas (NGR234 vs nopJ-, NGR234 vs nopM-, NGR234 vs rhcN, rhcN- vs nopJ-, rhcNvs nopM- e nopJ- vs nopM-) para primórdio e nódulo. Os genes considerados diferencialmente expressos entre as condições (valor de p ? 0.05 e fold-change ? 2) foram categorizados quanto a função no programa Mapman v 3.5.1. Os resultados sugerem que os Nops translocados pelo sistema de secreção tipo III de NGR234 no citoplasma de P. vulgaris ativam a transcrição de vários genes envolvidos na defesa da planta e resposta ao estresse. Abstract: Biological nitrogen fixation is the process of dinitrogen conversion into ammonia through the activity of the nitrogenase enzyme complex present in diazotrophic bacteria. Sinorhizobium fredii NGR234 is a bacterium capable of fixing nitrogen inside structures known as nodules, and presents a type III secretion system that secretes five effector proteins (NopM, NopJ, NopT, NopP and NopL). These proteins cause modifications in the plant cell physiology and determine nodulation efficiency in different ways depending on the host plant. Phaseolus vulgaris (common bean) is a legume of great importance for food in Latin America and Africa countries. Beans can associate with S. fredii NGR234 and form nodules in the root where nitrogen fixation occurs. In this association, the S. fredii NGR234 secretion system has a negative effect on P. vulgaris nodulation. The nodulation process depends on the plant-bacteria recognition and involves a cascade of many steps, including flavonoids secretion by plant roots and the production of Nod factors, polysaccharides and effector proteins (Nops) by the bacteria. The molecular aspects of Nops recognition by the host are poorly known. Thus, this work aimed to identify the P. vulgaris genes differentially expressed in response to S. fredii NGR234 Nops, as well as the metabolic pathways in which they are involved. For this, the P. vulgaris transcriptome after inoculation with NGR234 wild-type strain and nopM-, nopJ- and rhcN- mutants was analysed. RNA samples were obtained in two phases of nodule development, 10 days (primordia) and 21 days (nodule). cDNA libraries were sequenced and the reads obtained were mapped into the P. vulgaris genome. The genes were compared between the conditions tested (NGR234 vs nopJ-, NGR234 vs nopM-, NGR234 vs rhcN-, rhcN- vs nopJ-, rhcN - vs nopM- and nopJvs nopM-) for primordia and nodule samples. Genes differentially expressed between conditions (p value ? 0.05 and fold change ? 2) were categorized by function in the Mapman v 3.5.1 program. The results suggest that Nops translocated by the NGR234 type III secretion system in the P. vulgaris cytoplasm activate the transcription of several genes involved in plant defense and stress response.
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- 2019
48. Caracterização da glutamina sintetase da estirpe excretora de amônio HM053 de Azospirillum brasiliense
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Ghenov, Fernanda, 1988, Wassem, Roseli, Universidade Federal do Paraná. Setor de Ciências Biológicas. Programa de Pós-Graduação em Ciências (Bioquímica), and Souza, Emanuel Maltempi de, 1964
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Nitrogênio - Fixação ,Bioquímica ,Genes ,Azospirillum brasilense - Abstract
Orientador: Prof. Dr. Emanuel Maltempi Souza Coorientadora: Prof. Dra. Roseli Wassem Dissertação (mestrado) - Universidade Federal do Paraná, Setor de Ciências Biológicas, Programa de Pós-Graduação em Ciências (Bioquímica). Defesa : Curitiba, 28/03/2018 Inclui referências: p.68-76 Resumo: O nitrogênio é um elemento macro essencial para os organismos vivos. O gás nitrogênio (N2), presente em grandes quantidades na atmosfera, é uma forma biologicamente indisponível para a maioria dos organismos. As bactérias diazotróficas, como Azospirillum brasilense, podem converter N2 em formas prontamente disponíveis, como o amônio, através da fixação de nitrogênio. O amônio produzido é usado para a síntese de glutamina em uma reação catalisada pela glutamina sintetase (GS), esse produto é convertido em outros compostos de nitrogênio. O gene glnA de Azospirillum brasilense HM053 tem uma mutação pontual (citosina para timina na posição 1040) que codifica uma glutamina sintetase com atividade muito baixa. Acredita-se que, devido à baixa atividade desta enzima, o amônio produzido pela nitrogenase não é totalmente assimilado e, como consequência, HM053 excreta parte do amônio produzido. Este trabalho caracteriza a GS mutante do Azospirillum brasilense HM053. Os genes glnA da estirpe mutante e da estirpe selvagem foram clonados em pET28a. Os plasmídeos recombinantes foram utilizados para superexpressar GS em E. coli e as proteínas foram purificadas por cromatografia de afinidade em coluna HiTrap-Chellating. A GS também foi extraída e purificada diretamente da bactéria do tipo selvagem de A. brasilense. As proteínas purificadas foram caracterizadas por SDS PAGE/western blot e MALDI-TOF espectrometria de massa. Os resultados mostraram que a GS do HM053 (P347L) tem baixa atividade e é indiferente à adenililação, se mantendo desadenililada. A mutação P347L localizada distante do sítio ativo e do sítio de adenililação pode ter causado mudanças estruturais na GS, afetando sua atividade e adenililação. Palavras-chave: Fixação de nitrogênio. Glutamina sintetase. Azospirillum brasilense. Gene glnA Abstract: Nitrogen is an essential macro element for living organisms. Nitrogen gas (N2), present in vast quantities in the atmosphere, is a form biologically unavailable for most organisms. Diazotrophic bacteria, such as Azospirillum brasilense, can convert N2 to readily available forms, such as ammonium, through nitrogen fixation. The ammonium produced is used for the synthesis of glutamine in a reaction catalyzed by glutamine synthetase (GS), the product is converted to other nitrogen compounds. The glnA gene of Azospirillum brasilense HM053 has a point mutation (cytosine to thymine at position 1040) encoding a glutamine synthetase with very low activity. It is believed that due to the low activity of this enzyme, the ammonium produced by the nitrogenase is not totally assimilated and, as a consequence, HM053 excretes part of the ammonium produced. This work characterizes the GS mutant of Azospirillum brasilense HM053. The glnA genes of the mutant strain and the wild strain were cloned into pET28a. The recombinant plasmids were used to overexpress GS in E. coli and the proteins were purified by affinity chromatography on HiTrap-Chellating column. The GS was also extracted and purified from A. brasilense wild type. The purified proteins were characterized by SDS PAGE/western blot and MALDI-TOF mass spectrometry. The results showed that the HM053GS (P347L) has low activity and insensitive to adenylylation, remaining disadenylated. The mutation P347L located distant from the active and adenylylation sites might caused structural change in GS affecting its activity and adenylylation. Keywords: Nitrogen fixation. Glutamine synthetase. Azospirillum brasilense. Gene glnA
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- 2018
49. Análise metagenômica do microbioma de mangue do Litoral do Paraná
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Seccon, Denny Marcel, Faoro, Helisson, Wassem, Roseli, Universidade Federal do Paraná. Setor de Ciências Biológicas. Programa de Pós-Graduação em Ciências (Bioquímica), and Pedrosa, Fábio de Oliveira, 1947
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Bioquímica ,Metagenômica ,Manguezais - Paraná - Abstract
Orientador : Prof. Fábio Oliveira Pedrosa Coorientador : Helisson Faoro Coorientador : Profª. Roseli Wassem Tese (doutorado) - Universidade Federal do Paraná, Setor de Ciências Biológicas, Programa de Pós-Graduação em Ciências : Bioquímica. Defesa: Curitiba, 27/09/2016 Inclui referências : f. 24-27;71-75;78-88 Resumo: A descrição da penicilina revelou que microrganismos eram a fonte primária de muitos produtos naturais com aplicações farmacológicas. Sua bem-sucedida adoção medicamentosa foi seguida por um período prolífico de isolamento de novas drogas obtidas a partir de microrganismos encontrados no ambiente. Entretanto, a velocidade de novas descobertas diminuiu quando se observou que a grande maioria dos microrganismos não era prontamente cultivável em condições laboratoriais, ao mesmo tempo em que os organismos patogênicos alvo das drogas que vinham sendo usadas desenvolviam resistência. Logo ficou evidente que a empreitada deveria buscar novas estratégias. Pesquisadores passaram a estudar novas classes de metabólitos secundários, entre os quais chamou a atenção os produtos das sintetases de peptídeos não-ribossomais (NRPS) e sintases de policetídeos (PKS). Os módulos que compõem esses sistemas enzimáticos são formados por alguns domínios básicos e outros opcionais, que a partir de precursores simples - aminoácidos e acetato, respectivamente - são capazes de sintetizar moléculas com grande variedade estrutural, muitas com atividade biológica igualmente diversa. Outra frente de investigação se aproveitou dos avanços nas técnicas de isolamento e pesquisa independente de cultivo para explorar ambientes antes negligenciados, como o mar, que logo revelou hospedar uma nova gama de microrganismos e produtos derivados. Além de informações funcionais específicas, a exploração eficiente e sustentável desses ambientes exige uma melhor caracterização de suas comunidades microbianas; microrganismos são componentes essenciais de seu funcionamento, mas essa literatura ainda é escassa. Em virtude disso, esse trabalho propôs a investigação do microbioma de sedimentos de mangue da região da Baía de Paranaguá, Paraná, Brasil, através de metagenômica. No primeiro capítulo, usamos técnicas de sequenciamento de amplicons gerados a partir do gene de rRNA 16S para caracterizar a comunidade presente e determinar os fatores ambientais que moldam essa estrutura. Encontramos um predomínio dos filos Proteobacteria, Bacteroidetes, Cyanobacteria, Chloroflexi e Acidobacteria, quase todos significativamente afetando as estruturas intralocais. As classes mais abundantes foram Deltaproteobacteria, Gammaproteobacteria e Alphaproteobacteria. Revelamos forte influência da composição química derivada da proximidade do mar, sendo os fatores pH (SMP), H++Al3+, Ca2+, Mg2+, Na+, T, P, Na% e Ca/Mg significativos, mas não encontramos efeito de presença de planta, possibilidade descrita na literatura. Comparamos essa comunidade com a de outros mangues e encontramos similaridades que apontam para um perfil característico dependente de bioma, dominado pelos mesmo filos abundantes encontrados no mangue paranaense. No segundo capítulo, realizamos o sequenciamento shotgun de duas amostras do mangue pertencentes a localizações quimicamente diversas para determinar seu perfil funcional. As funções prevalentes eram relacionadas a subsistemas baseados em formação de cluster, carboidratos, aminoácidos e derivados, e funções variadas. Em níveis hierárquicos mais baixos, a abundância relativa de funções é geralmente balanceada. As diferenças funcionais também se mostraram dependentes de fatores ambientais, mas essa influência é menor do que no perfil taxonômico, o que indica resiliência funcional frente a alterações externas. As similaridades do mangue frente a outros biomas se mostraram mais dependentes de tipo de matriz (onde solo > água) do que de composição química (onde salina > não-salina); as dissimilaridades funcionais também foram menores que as taxonômicas, mas sua intensidade manteve relação com o grau de diferença de ambiente. No terceiro capítulo, o sequenciamento e processamento de amplicons provindos dos domínios A e C de enzimas NRPS, e KS de enzimas PKS, confirmou o mangue estudado como fonte potencial de metabólitos secundários. As medidas de diversidade não mostraram um padrão entre domínios enzimáticos, mas sugerem os melhores grupos para prospecção: verão | localização B para domínios A, inverno | localização B para domínios C, e inverno | localização A para domínios KS. Apesar de muitas sequências encontradas terem sido taxonomicamente afiliadas a gêneros reportadamente envolvidos na síntese desses metabólitos secundários, a descoberta de novos produtores é esperada dado o número de OTUs reportados e a presença de muitas sequências relacionadas a bactérias não caracterizadas. Os resultados apresentados devem servir de base para futuros estudos de prospecção direcionada. Abstract: The description of penicillin revealed that microorganisms were the primary source of many natural products with pharmacological application. Its successful adoption as a medicament was followed by a prolific period in the isolation of new drugs obtained from microorganisms found in the environment. However, the pace of new discoveries decreased when it was noticed that the vast majority of microorganisms was not readily cultivable in laboratorial conditions, while the pathogenic organisms targeted by drugs in use developed resistance. It soon became evident that the enterprise should try new strategies. Researchers started studying new classes of secondary metabolites, among which much attention was given to the products of non-ribosomal peptide synthetases (NRPS) and polyketide synthases (PKS). The modules building these enzymatic systems are formed by some basic and optional domains, which, from simple precursors - amino acids and acetate, respectively - are able to synthetize molecules with an incredible structural variety, many with equality diverse biological activity. Another front of investigation took advantage of the advances in isolation and cultivation-independent research techniques to explore environments previously neglected, like the ocean, which soon revealed to host a whole new range of microorganisms and derived products. Besides specific functional information, the efficient and sustainable exploration of such environments demands a better characterization of their microbial communities; microorganisms are essential components of their functioning, yet this literature is scarce. Following from these, this work proposed investigating the microbiome of mangrove sediments from the region of Paranaguá Bay, Paraná, Brazil, through metagenomics. In the first chapter, we used 16S rRNA gene-amplicon sequencing to characterize the community present and to determine the environmental factors shaping this structure. We found a predominance of phyla Proteobacteria, Bacteroidetes, Cyanobacteria, Chloroflexi and Acidobacteria, almost all significantly affecting the intralocal structures. The most abundant classes were Deltaproteobacteria, Gammaproteobacteria and Alphaproteobacteria. We revealed a strong influence of the chemical composition derived from the proximity to sea, being significant the factors pH (SMP), H++Al3+, Ca2+, Mg2+, Na+, T, P, Na% and Ca/Mg, but we found no plant effect, a possibility described in the literature. We compared this community with those of other mangroves and found similarities that point to a biome-dependent characteristic profile, dominated by the same abundant phyla found in the mangrove from Paraná. In the second chapter, we performed the shotgun sequencing of two mangrove samples from different environments to determine their functional profile. Prevailing functions were related to clustering-based subsystems, carbohydrates, amino acids and derivatives, and miscellaneous functions. In lowest hierarchy levels, the relative abundance of functions is generally balanced. The functional differences were also dependent on environmental factors, but this influence was smaller than in the taxonomic profile, which indicates functional resilience in front of external changes. The similarities of mangroves to other biomes were more dependent on matrix type (where soil > water) than on chemical composition (where saline > nonsaline); the functional dissimilarities were also smaller than the taxonomical, but the intensity kept its relation to the degree of environmental difference. In the third chapter, sequencing and processing of amplicons derived from A and C domains from NRPS, and KS from PKS, confirmed the studied mangrove as a potential source of secondary metabolites. The diversity measures showed no pattern among the enzymatic domains, but suggest the most suitable groups for prospection: summer | location B for A domains, winter | location B for C domains, and winter | location A for KS domains. Even though many sequences were taxonomically affiliated to genera reportedly involved in the production of such secondary metabolites, the discovery of new producers is expected given the number of OTUs reported and the presence of many sequences affiliated to uncharacterized bacteria. The results presented will be the basis for future studies of directed prospection.
- Published
- 2016
50. Análise de expressão diferencial de Sinorhizobium fredii NGR234 em nódulos de diferentes plantas hospedeiras
- Author
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Stabach, Carolini Gremski, Bonatto, Ana Claudia, Universidade Federal do Paraná. Setor de Ciências Biológicas. Programa de Pós-Graduação em Genética, and Wassem, Roseli
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Microorganismos ,Plantas hospedeiras - Abstract
Orientadora : Profª Drª Roseli Wassem Co-orientadora : Profª Drª Ana Claudia Bonatto Dissertação (mestrado) - Universidade Federal do Paraná, Setor de Ciências Biológicas, Programa de Pós-Graduação em Genética. Defesa: Curitiba, 30/03/2016 Inclui referências : f. 95-111 Área de concentração Resumo: Sinorhizobium fredii NGR234 é um microrganismo capaz de fixar nitrogênio e é considerado um organismo modelo para estudos envolvendo interação simbiótica, devido a diversos trabalhos realizados com essa estirpe e ao conhecimento que se tem acerca de seu genoma. As interações planta-bactéria são consequência da troca de sinais moleculares específicos entre as espécies, de forma coordenada e integrada. Conhecer, a nível molecular e genético, as mudanças que ocorrem no metabolismo desses organismos, além da regulação de sinais e a expressão diferencial de genes quando o rizóbio se encontra sob diferentes condições é de grande importância para o processo de simbiose. Com o intuito de identificar diferenças no processo de interação entre S. fredii NGR234 e Phaseolus vulgaris, Tephrosia vogelii e Vigna unguiculata, foi analisado o transcriptoma de NGR234 através de RNA-Seq buscando os genes diferencialmente expressos. A confirmação de alguns genes que se mostraram diferenciais foi realizada através de RT-qPCR e de fusão transcricional a gene repórter (gfp) para observação de fluorescência em cortes de nódulos utilizando microscopia confocal. Além disso, esses genes foram analisados, com a finalidade de indicar as vias metabólicas e processos celulares de S. fredii NGR234 que esses genes pertencem, e assim, discutir a nível gênico as causas e consequências dessas diferenças. Como resultado, um pequeno número de genes diferencialmente expressos foi associado com o tipo de nódulo (determinado ou indeterminado), e várias evidências confirmaram que uma melhor fixação de nitrogênio ocorre em T. vogelii e em V. unguiculata. Os genes que compõem os operons do sistema de secreção tipo três (TTSS) e de síntese de lipopolissacarídeos ricos em ramnose foram mais expressos nos bacteroides de P. vulgaris e T. vogelii, em relação aos de V. unguiculata. Além das análises de genes diferencialmente expressos, uma análise preliminar de identificação de ncRNAs também foi realizada, já que nessa espécie não existe um amplo conhecimento acerca dos ncRNAs presentes em seu genoma. De um modo geral, esse trabalho gerou um conjunto de dados que poderá ser utilizado como referência para futuras investigações e estudos de vias e sistemas envolvidos na simbiose. Esses estudos serão importantes para um entendimento mais específico do processo de nodulação. Abstract: Sinorhizobium fredii NGR234 is a microorganism that is able to fix nitrogen. It is considered a model organism in studies involving symbiotic interaction due to extensive research with this strain and what is known about its genome. Plant-bacteria interactions are a result of the exchange of specific molecular signals between species, in a coordinated and integrated way. The information about molecular and genetic changes that occur in the metabolism of these organisms, the signaling regulation, and the differential expression when the Rhizobium is under different conditions is of great importance in the process of symbiosis. In order to identify differences in the interaction process between S. fredii NGR234 and Phaseolus vulgaris, Tephrosia vogelii and Vigna unguiculata, the NGR234 transcriptome was analyzed using RNA-Seq, seeking differentially expressed genes. Confirmation of genes that seemed differential was performed by RT-qPCR and by confocal microscopy with transcriptional fusion with gfp as reporter gene. In addition, these genes were analyzed in order to recognize the S. fredii NGR234 metabolic pathways and cellular processes in which they take part, and thus discuss the causes and consequences of these differences. As a result, a small number of differentially expressed genes was associated with the type of nodule (determinate or indeterminate), and multiple lines of evidence confirmed that better nitrogen fixation occurs in T. vogelii and V. unguiculata. The genes present in the operons of the Type Three Secretion System (TTSS) and the synthesis of lipopolysaccharides rich in rhamnose were more expressed in P. vulgaris and T. vogelii bacteroids when compared to V. unguiculata. ncRNAs preliminary analysis was also performed, since there is no extensive knowledge about the ncRNAs that are present in the S. fredii NGR234 genome. Overall, this study has generated a data set which can be used as reference for future research and studies of the pathways and systems involved in symbiosis. These studies will be important for a more specific understanding of the nodulation process.
- Published
- 2016
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