Microgravity induces changes in microsome-associated proteins of Arabidopsis seedlings grown on board the international space station

• Published in: PloS one Vol. 9; no. 3; p. e91814
• Main Authors: Mazars, Christian, Brière, Christian, Grat, Sabine, Pichereaux, Carole, Rossignol, Michel, Pereda-Loth, Veronica, Eche, Brigitte, Boucheron-Dubuisson, Elodie, Le Disquet, Isabel, Medina, Francisco Javier, Graziana, Annick, Carnero-Diaz, Eugénie
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 11.03.2014; Public Library of Science (PLoS)
• Subjects: Arabidopsis; Arabidopsis - growth & development; Arabidopsis - metabolism; Arabidopsis Proteins - metabolism; Arabidopsis thaliana; Biology; Biosynthesis; Botanics; Clustering; Cultivation; Cytochrome; Enzymes; Gene expression; Gravity; Ground stations; Homeostasis; International Space Station; Life Sciences; Membrane Proteins - metabolism; Membranes; Metabolism; Microgravity; Microsomes; Microsomes - metabolism; Modular systems; Phenotype; Physiological aspects; Protein Transport; Proteins; Proteomics; Seedlings; Seedlings - growth & development; Signal transduction; Signaling; Space Flight; Space stations; Studies; Vegetal Biology; Weightlessness
• DOI: 10.1371/journal.pone.0091814
• ISSN: 1932-6203

The "GENARA A" experiment was designed to monitor global changes in the proteome of membranes of Arabidopsis thaliana seedlings subjected to microgravity on board the International Space Station (ISS). For this purpose, 12-day-old seedlings were grown either in space, in the European Modular Cultivation System (EMCS) under microgravity or on a 1 g centrifuge, or on the ground. Proteins associated to membranes were selectively extracted from microsomes and identified and quantified through LC-MS-MS using a label-free method. Among the 1484 proteins identified and quantified in the 3 conditions mentioned above, 80 membrane-associated proteins were significantly more abundant in seedlings grown under microgravity in space than under 1 g (space and ground) and 69 were less abundant. Clustering of these proteins according to their predicted function indicates that proteins associated to auxin metabolism and trafficking were depleted in the microsomal fraction in µg space conditions, whereas proteins associated to stress responses, defence and metabolism were more abundant in µg than in 1 g indicating that microgravity is perceived by plants as a stressful environment. These results clearly indicate that a global membrane proteomics approach gives a snapshot of the cell status and its signaling activity in response to microgravity and highlight the major processes affected.