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2. Endosomal membrane budding patterns in plants.

Author

Weiner, Ethan, Berryman, Elizabeth, Frey, Felix, Solís, Ariadna González, Leier, André, Lago, Tatiana Marquez, Šarić, Anđela, and Otegui, Marisa S.

Subjects
MOLECULAR dynamics, PROTEOLYSIS, BINDING energy, MEMBRANE proteins, PHANEROGAMS
Abstract

Multivesicular endosomes (MVEs) sequester membrane proteins destined for degradation within intralumenal vesicles (ILVs), a process mediated by the membrane-remodeling action of Endosomal Sorting Complex Required for Transport (ESCRT) proteins. In Arabidopsis, endosomal membrane constriction and scission are uncoupled, resulting in the formation of extensive concatenated ILV networks and enhancing cargo sequestration efficiency. Here, we used a combination of electron tomography, computer simulations, and mathematical modeling to address the questions of when concatenated ILV networks evolved in plants and what drives their formation. Through morphometric analyses of tomographic reconstructions of endosomes across yeast, algae, and various land plants, we have found that ILV concatenation is widespread within plant species, but only prevalent in seed plants, especially in flowering plants. Multiple budding sites that require the formation of pores in the limiting membrane were only identified in hornworts and seed plants, suggesting that this mechanism has evolved independently in both plant lineages. To identify the conditions under which these multiple budding sites can arise, we used particle-based molecular dynamics simulations and found that changes in ESCRT filament properties, such as filament curvature and membrane binding energy, can generate the membrane shapes observed in multiple budding sites. To understand the relationship between membrane budding activity and ILV network topology, we performed computational simulations and identified a set of membrane remodeling parameters that can recapitulate our tomographic datasets. [ABSTRACT FROM AUTHOR]

Published
2024
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7. Sphingolipid Long-Chain Base Signaling in Compatible and Non-Compatible Plant–Pathogen Interactions in Arabidopsis

Author

Saucedo-García, Mariana, primary, González-Solís, Ariadna, additional, Rodríguez-Mejía, Priscila, additional, Lozano-Rosas, Guadalupe, additional, Olivera-Flores, Teresa de Jesús, additional, Carmona-Salazar, Laura, additional, Guevara-García, A. Arturo, additional, Cahoon, Edgar B., additional, and Gavilanes-Ruíz, Marina, additional

Published
2023
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12. Proteolytic activities and profiles as useful traits to select barley cultivars for beer production

Author

Nájera‐Torres, Edgar, primary, Bernal‐Gracida, Lilia Angélica, additional, González‐Solís, Ariadna, additional, Schulte‐Sasse, Mariana, additional, Castañón‐Suárez, Claudio, additional, Juárez‐Díaz, Javier Andrés, additional, Cruz‐Zamora, Yuridia, additional, Vázquez‐Santana, Sonia, additional, Figueroa, Mario, additional, and Cruz‐García, Felipe, additional

Published
2022
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13. La protesta mapuche durant la pandèmia

Author

Rojas Pedemonte, Nicolás, Gálvez, Diego, and Solís, Ariadna

Subjects
militarization, militarización, pandemic, militarització, pandemia, territori, territory, repertorio de protesta, repertori de protesta, territorio, repertoire of contention, pandèmia
Abstract

Els aixecaments socials durant l'any 2020, comporten i estenen la lluita social de l'Esclat Social d'octubre del 2019, la influència del qual persisteix en territoris on la violència estructural, política i policial-militar segueixen passant de forma arbitrària. Els nombrosos abusos i violacions dels drets humans dels manifestants, durant les mobilitzacions arran de l'Esclat, van revelar el nivell d'antipatia i hostilitat per part del govern, la força policial i les elits dels sectors més afavorit de la societat xilena, que, alhora, va desencadenar la unitat d'un poble intercultural davant de les injustícies proliferades. Aquestes accions repressores són un exemple del quotidià escenari al qual s'enfronta, i resisteix, el poble maputxe a Wallmapu o “Gran Araucanía”, reproduït històricament per l'Estat xilè. Aquest articlepresenta una continuació de l'anàlisi dels conflictes en territori maputxe dels capítols La protesta maputxe com a procés interactiu: Espais i dinàmiques del conflicte en el retorn de Piñera, 2018 i La protesta maputxe més enllà (i més aquí) de l'Esclat Social , 2019 per a una actual interpretació dels diferents i nous fets de protesta, ocorreguts durant l'any 2020 en territori maputxe, específicament a tres províncies de Wallmapu: Malleco, Cautín i Arauco., Given the pandemic scenario that characterized the year 2020 at a global and national level, it is especially relevant to analyze the different repertoires of Mapuche protest, in light of the strong limitations in daily and public life, with increased police control, the implementation of sanitary measures and the military deployment in the Wallmapu. This study reviewed and compared the different protest news events recorded in online media during 2020. The results showed a high concentration of disruptive protest in the province of Arauco, along with an increase in hunger strikes by Mapuche political prisoners, as in Temuco and Padre Las Casas. The article concludes with some reflections on the anti-Mapuche mobilization as a novelty, along with new repertoires and new insurrectionary organizations in a context of militarization and lack of socio-sanitary protection, Los levantamientos sociales durante el año 2020, acarrean y extienden la lucha social del Estallido Social de octubre del 2019, cuya influencia persiste en territorios donde la violencia estructural, política y policial-militar siguen ocurriendo de forma arbitraria. Los numerosos abusos y violaciones de los derechos humanos de los manifestantes, durante las movilizaciones a raíz del Estallido, revelaron el nivel de antipatía y hostilidad por parte del gobierno, la fuerza policial y las élites de los sectores más favorecido de la sociedad chilena, lo que, a su vez, desencadenó la unidad de un pueblo intercultural frente a las injusticias proliferadas. Estas acciones represoras son un ejemplo del cotidiano escenario al cual se enfrenta, y resiste, el pueblo mapuche en Wallmapu o “Gran Araucanía”, reproducido históricamente por el Estado chileno. Este artículo, presenta una continuación del análisis de los conflictos en territorio mapuche de los capítulos La protesta mapuche como proceso interactivo: Espacios y dinámicas del conflicto en el retorno de Piñera, 2018 y La protesta mapuche más allá (y más acá) del Estallido Social, 2019 para una actual interpretación de los diferentes y nuevos hechos de protesta, ocurridos durante el año 2020 en territorio mapuche, específicamente en tres provincias de Wallmapu: Malleco, Cautín y Arauco.

Published
2021

15. Dissecting the Regulatory Network of Sphingolipid Biosynthesis in Plants

Author

González Solís, Ariadna and González Solís, Ariadna

Abstract

Sphingolipids are a structurally diverse group of lipids recognized as important components of cellular membranes and regulators of processes during development and in response to environmental stresses. Much progress has been made characterizing the enzymes of the biosynthetic pathway revealing that sphingolipids are essential molecules in plants and that their synthesis and degradation needs to be tightly regulated. Serine palmitoyltransferase (SPT) catalyzes the first step in sphingolipid biosynthesis and is a primary regulatory point for homeostasis. ORM proteins have been identified as negative regulators of SPT activity, however the mechanistic details of the regulation and other functional roles of these proteins are only beginning to be understood. In this work, we show that ORM1 and ORM2 are essential for life cycle completion in Arabidopsis thaliana. Through the characterization of ORM gene-edited mutants we described that unregulated sphingolipid biosynthesis resulted in ceramide hyperaccumulation, altered organellar structures and increased senescence- and pathogenesis-related gene expression. Furthermore, the study of a structural ORM1 variant provided information about a transmembrane domain involved in the interaction with SPT. In this thesis, we also provide insights into the physiological effects caused by mutations in SPT that induce the production of deoxysphingolipids. Our research demonstrates that plants expressing these mutations showed early senescence and reduced sensitivity to the cell death induced by Fumonisin B1. These findings suggest functional roles of deoxysphingolipids that have not been explored in plants. Finally, we describe a labeling approach to build a sphingolipid kinetic model to study the metabolic flux of sphingolipids during pathogen infection. This study considers a more comprehensive view of the sphingolipid metabolic network that changes dynamically when perturbed. Overall, this study encompasses several aspects of sph

Published
2020

17. Permanencias urbano-arquitectónicas de haciendas y ranchos en el nororiente de Puebla

Author

González Solís, Ariadna Leecet and González Solís, Ariadna Leecet

Abstract

In the present article is studied the urbanization process that ocurred in the northeast of Puebla city during the first half of the twentieth century, resulting in a superposition of structures, which can be read thorugh the urban-architectural permanencies of farms and ranches, immersed in the actual urban fabric. The main objective is to analyze the process of incorporation of rural land into the urban fabric in the northeast of Puebla, as an antecedent to study the actual state of the urban-architectural permanencies of haciendas and ranchos, to finally bring viable alternatives for incorporation of these remains, to the current needs of society to ensure its permanence as a legacy., En el presente artículo se aborda el proceso de urbanización sucedido en el nororiente de la ciudad de Puebla durante la primera mitad del siglo XX, cuyo resultado fue una superposición de estructuras, que puede ser leída a través de las permanencias urbano-arquitectónicas de haciendas y ranchos que se encuentran inmersas en el tejido urbano actual. El objetivo principal fue analizar el proceso de incorporación del suelo rural a la mancha urbana de la zona nororiente de Puebla, a manera de antecedente al estudio del estado actual de las permanencias urbano-arquitectónicas de haciendas y ranchos; para finalmente plantear alternativas viables de incorporación de estos vestigios, a las necesidades actuales de la sociedad, con el fin de asegurar su permanencia como legado.

Published
2015

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