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102. F1FO ATP synthase mutants in Chlamydomonas: Stability and oligomycin resistance mediated by atypical Asa7 protein; interaction between chloroplastic and mitochondrial bioenergetics

Author

Lapaille, Marie, primary, Escobar-Ramírez, Adelma, additional, Degand, Hervé, additional, Baurain, Denis, additional, Thiry, Marc, additional, Perez, Emilie, additional, Boutry, Marc, additional, Gonzalez-Halphen, Diego, additional, Remacle, Claire, additional, and Cardol, Pierre, additional

Published
2010
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103. 3D-reconstruction and overall topology of the dimeric mitochondrial ATP synthase of the colorless alga Polytomella sp

Author

González-Halphen, Diego, primary, Vázquez-Acevedo, Miriam, additional, Cano-Estrada, Araceli, additional, Villavicencio-Queijeiro, Alexa, additional, Cordeiro, Yraima, additional, Mignaco, Julio A., additional, Foguel, Debora, additional, Cardol, Pierre, additional, Remacle, Claire, additional, and Wilkens, Stephan, additional

Published
2010
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104. Proteomic and Functional Characterization of a Chlamydomonas reinhardtii Mutant Lacking the Mitochondrial Alternative Oxidase 1

Author

Mathy, Grégory, primary, Cardol, Pierre, additional, Dinant, Monique, additional, Blomme, Arnaud, additional, Gérin, Stéphanie, additional, Cloes, Marie, additional, Ghysels, Bart, additional, DePauw, Edwin, additional, Leprince, Pierre, additional, Remacle, Claire, additional, Sluse-Goffart, Claudine, additional, Franck, Fabrice, additional, Matagne, René F., additional, and Sluse, Francis E., additional

Published
2010
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107. The Chlamydomonas Genome Reveals the Evolution of Key Animal and Plant Functions

Author

Merchant, Sabeeha S., primary, Prochnik, Simon E., additional, Vallon, Olivier, additional, Harris, Elizabeth H., additional, Karpowicz, Steven J., additional, Witman, George B., additional, Terry, Astrid, additional, Salamov, Asaf, additional, Fritz-Laylin, Lillian K., additional, Maréchal-Drouard, Laurence, additional, Marshall, Wallace F., additional, Qu, Liang-Hu, additional, Nelson, David R., additional, Sanderfoot, Anton A., additional, Spalding, Martin H., additional, Kapitonov, Vladimir V., additional, Ren, Qinghu, additional, Ferris, Patrick, additional, Lindquist, Erika, additional, Shapiro, Harris, additional, Lucas, Susan M., additional, Grimwood, Jane, additional, Schmutz, Jeremy, additional, Cardol, Pierre, additional, Cerutti, Heriberto, additional, Chanfreau, Guillaume, additional, Chen, Chun-Long, additional, Cognat, Valérie, additional, Croft, Martin T., additional, Dent, Rachel, additional, Dutcher, Susan, additional, Fernández, Emilio, additional, Fukuzawa, Hideya, additional, González-Ballester, David, additional, González-Halphen, Diego, additional, Hallmann, Armin, additional, Hanikenne, Marc, additional, Hippler, Michael, additional, Inwood, William, additional, Jabbari, Kamel, additional, Kalanon, Ming, additional, Kuras, Richard, additional, Lefebvre, Paul A., additional, Lemaire, Stéphane D., additional, Lobanov, Alexey V., additional, Lohr, Martin, additional, Manuell, Andrea, additional, Meier, Iris, additional, Mets, Laurens, additional, Mittag, Maria, additional, Mittelmeier, Telsa, additional, Moroney, James V., additional, Moseley, Jeffrey, additional, Napoli, Carolyn, additional, Nedelcu, Aurora M., additional, Niyogi, Krishna, additional, Novoselov, Sergey V., additional, Paulsen, Ian T., additional, Pazour, Greg, additional, Purton, Saul, additional, Ral, Jean-Philippe, additional, Riaño-Pachón, Diego Mauricio, additional, Riekhof, Wayne, additional, Rymarquis, Linda, additional, Schroda, Michael, additional, Stern, David, additional, Umen, James, additional, Willows, Robert, additional, Wilson, Nedra, additional, Zimmer, Sara Lana, additional, Allmer, Jens, additional, Balk, Janneke, additional, Bisova, Katerina, additional, Chen, Chong-Jian, additional, Elias, Marek, additional, Gendler, Karla, additional, Hauser, Charles, additional, Lamb, Mary Rose, additional, Ledford, Heidi, additional, Long, Joanne C., additional, Minagawa, Jun, additional, Page, M. Dudley, additional, Pan, Junmin, additional, Pootakham, Wirulda, additional, Roje, Sanja, additional, Rose, Annkatrin, additional, Stahlberg, Eric, additional, Terauchi, Aimee M., additional, Yang, Pinfen, additional, Ball, Steven, additional, Bowler, Chris, additional, Dieckmann, Carol L., additional, Gladyshev, Vadim N., additional, Green, Pamela, additional, Jorgensen, Richard, additional, Mayfield, Stephen, additional, Mueller-Roeber, Bernd, additional, Rajamani, Sathish, additional, Sayre, Richard T., additional, Brokstein, Peter, additional, Dubchak, Inna, additional, Goodstein, David, additional, Hornick, Leila, additional, Huang, Y. Wayne, additional, Jhaveri, Jinal, additional, Luo, Yigong, additional, Martínez, Diego, additional, Ngau, Wing Chi Abby, additional, Otillar, Bobby, additional, Poliakov, Alexander, additional, Porter, Aaron, additional, Szajkowski, Lukasz, additional, Werner, Gregory, additional, Zhou, Kemin, additional, Grigoriev, Igor V., additional, Rokhsar, Daniel S., additional, and Grossman, Arthur R., additional

Published
2007
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108. Energetic coupling between plastids and mitochondria drives CO2 assimilation in diatoms.

Author

Bailleul, Benjamin, Berne, Nicolas, Murik, Omer, Petroutsos, Dimitris, Prihoda, Judit, Tanaka, Atsuko, Villanova, Valeria, Bligny, Richard, Flori, Serena, Falconet, Denis, Krieger-Liszkay, Anja, Santabarbara, Stefano, Rappaport, Fabrice, Joliot, Pierre, Tirichine, Leila, Falkowski, Paul G., Cardol, Pierre, Bowler, Chris, and Finazzi, Giovanni

Subjects
PLASTIDS, MITOCHONDRIA, DIATOMS, CARBON dioxide, ABSORPTION, LITHOSPHERE, CARBON fixation, ADENOSINE triphosphatase
Abstract

Diatoms are one of the most ecologically successful classes of photosynthetic marine eukaryotes in the contemporary oceans. Over the past 30 million years, they have helped to moderate Earth's climate by absorbing carbon dioxide from the atmosphere, sequestering it via the biological carbon pump and ultimately burying organic carbon in the lithosphere. The proportion of planetary primary production by diatoms in the modern oceans is roughly equivalent to that of terrestrial rainforests. In photosynthesis, the efficient conversion of carbon dioxide into organic matter requires a tight control of the ATP/NADPH ratio which, in other photosynthetic organisms, relies principally on a range of plastid-localized ATP generating processes. Here we show that diatoms regulate ATP/NADPH through extensive energetic exchanges between plastids and mitochondria. This interaction comprises the re-routing of reducing power generated in the plastid towards mitochondria and the import of mitochondrial ATP into the plastid, and is mandatory for optimized carbon fixation and growth. We propose that the process may have contributed to the ecological success of diatoms in the ocean. [ABSTRACT FROM AUTHOR]

Published
2015
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112. Function of the Chloroplast Hydrogenase in the Microalga Chlamydomonas: The Role of Hydrogenase and State Transitions during Photosynthetic Activation in Anaerobiosis

Author

Ghysels, Bart, Godaux, Damien, Matagne, René F., Cardol, Pierre, and Franck, Fabrice

Subjects
CHLOROPLASTS, HYDROGENASE, MICROALGAE, CHLAMYDOMONAS reinhardtii, PHOTOSYNTHESIS, ANAEROBIOSIS, ELECTRON transport
Abstract

Like a majority of photosynthetic microorganisms, the green unicellular alga Chlamydomonas reinhardtii may encounter O2 deprived conditions on a regular basis. In response to anaerobiosis or in a respiration defective context, the photosynthetic electron transport chain of Chlamydomonas is remodeled by a state transition process to a conformation that favours the photoproduction of ATP at the expense of reductant synthesis. In some unicellular green algae including Chlamydomonas, anoxia also triggers the induction of a chloroplast-located, oxygen sensitive hydrogenase, which accepts electrons from reduced ferredoxin to convert protons into molecular hydrogen. Although microalgal hydrogen evolution has received much interest for its biotechnological potential, its physiological role remains unclear. By using specific Chlamydomonas mutants, we demonstrate that the state transition ability and the hydrogenase function are both critical for induction of photosynthesis in anoxia. These two processes are thus important for survival of the cells when they are transiently placed in an anaerobic environment. [ABSTRACT FROM AUTHOR]

Published
2013
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113. Dual Strategy to Cope with High Light in Chlamydomonas reinhardtii.

Author

Allorent, Guillaume, Tokutsu, Ryutaro, Roach, Thomas, Peers, Graham, Cardol, Pierre, Girard-Bascou, Jacqueline, Seigneurin-Berny, Daphné, Petroutsos, Dimitris, Kuntz, Marcel, Breyton, Cécile, Franck, Fabrice, Wollman, Francis-André, Niyogi, Krishna K., Krieger-Liszkay, Anja, Minagawa, Jun, and Finazzi, Giovanni

Subjects
CHLAMYDOMONAS reinhardtii, CHLAMYDOMONAS, LIGHT absorption, ANTENNAS (Electronics), ELECTRON transport, ENERGY dissipation
Abstract

Absorption of light in excess of the capacity for photosynthetic electron transport is damaging to photosynthetic organisms. Several mechanisms exist to avoid photodamage, which are collectively referred to as nonphotochemical quenching. This term comprises at least two major processes. State transitions (qT) represent changes in the relative antenna sizes of photosystems II and I. High energy quenching (qE) is the increased thermal dissipation of light energy triggered by lumen acidification. To investigate the respective roles of qE and qT in photoprotection, a mutant (npq4 stt7-9) was generated in Chlamydomonas reinhardtii by crossing the state transition–deficient mutant (stt7-9) with a strain having a largely reduced qE capacity (npq4). The comparative phenotypic analysis of the wild type, single mutants, and double mutants reveals that both state transitions and qE are induced by high light. Moreover, the double mutant exhibits an increased photosensitivity with respect to the single mutants and the wild type. Therefore, we suggest that besides qE , state transitions also play a photoprotective role during high light acclimation of the cells, most likely by decreasing hydrogen peroxide production. These results are discussed in terms of the relative photoprotective benefit related to thermal dissipation of excess light and/or to the physical displacement of antennas from photosystem II. [ABSTRACT FROM AUTHOR]

Published
2013
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115. Alternative photosynthetic electron flow to oxygen in marine Synechococcus.

Author

Bailey S, Melis A, Mackey KR, Cardol P, Finazzi G, van Dijken G, Berg GM, Arrigo K, Shrager J, and Grossman A

Subjects
Adaptation, Physiological, Chlorophyll metabolism, Electron Transport, Enzyme Inhibitors pharmacology, Iron Deficiencies, Oxidation-Reduction, Oxidoreductases antagonists & inhibitors, Photosystem I Protein Complex metabolism, Photosystem II Protein Complex metabolism, Propyl Gallate pharmacology, Seawater chemistry, Synechococcus drug effects, Synechococcus enzymology, Synechococcus radiation effects, Thylakoids drug effects, Thylakoids enzymology, Thylakoids radiation effects, Time Factors, Iron metabolism, Oxidoreductases metabolism, Oxygen metabolism, Photosynthesis, Synechococcus metabolism, Thylakoids metabolism
Abstract

Cyanobacteria dominate the world's oceans where iron is often barely detectable. One manifestation of low iron adaptation in the oligotrophic marine environment is a decrease in levels of iron-rich photosynthetic components, including the reaction center of photosystem I and the cytochrome b6f complex [R.F. Strzepek and P.J. Harrison, Photosynthetic architecture differs in coastal and oceanic diatoms, Nature 431 (2004) 689-692.]. These thylakoid membrane components have well characterised roles in linear and cyclic photosynthetic electron transport and their low abundance creates potential impediments to photosynthetic function. Here we show that the marine cyanobacterium Synechococcus WH8102 exhibits significant alternative electron flow to O2, a potential adaptation to the low iron environment in oligotrophic oceans. This alternative electron flow appears to extract electrons from the intersystem electron transport chain, prior to photosystem I. Inhibitor studies demonstrate that a propyl gallate-sensitive oxidase mediates this flow of electrons to oxygen, which in turn alleviates excessive photosystem II excitation pressure that can often occur even at relatively low irradiance. These findings are also discussed in the context of satisfying the energetic requirements of the cell when photosystem I abundance is low.

Published
2008
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