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Thermoacclimation and genome adaptation of the membrane lipidome in marine Synechococcus

TitleThermoacclimation and genome adaptation of the membrane lipidome in marine Synechococcus
Publication TypeJournal Article
Year of Publication2017
AuthorsPittera J, Jouhet J, Breton S, Garczarek L, Partensky F, Maréchal É, Nguyen NAn, Doré H, Ratin M, Pitt FD, Scanlan DJ, Six C
JournalEnvironmental Microbiology
Paginationin press
Date Publishednov
Keywords2017, rcc1084, RCC1085, RCC1086, RCC1087, RCC2033, RCC2035, RCC2319, RCC2366, RCC2368, RCC2369, RCC2374, RCC2376, RCC2378, RCC2379, rcc2380, RCC2381, rcc2382, RCC2383, RCC2385, RCC2433, RCC2436, RCC2437, RCC2438, RCC2527, RCC2528, RCC2533, RCC2534, RCC2535, RCC2553, RCC2554, RCC2555, RCC2556, RCC2571, RCC2673, RCC28, RCC307, RCC328, RCC515, rcc539, rcc555, RCC556, RCC753, rcc791, sbr{\_}phyto{\_}mapp

Our study constitutes the first comprehensive lipidomic work on marine Synechococcus, in which we show that these ecologically relevant cyanobacteria have a specific membrane lipidome structure and use particular thermoacclimation processes to maintain photosynthetic activity. Our work strongly suggests that the structure and thermoregulation of cyanobacterial membranes is thus actually much more diverse than was previously thought, to some extent rewriting the dogmas that have been established by the numerous studies on freshwater cyanobacteria. In addition, using sequences retrieved from 53 genomes, including many new genomes, we show that the enzymatic machinery catalyzing the last reactions of the membrane lipid biosynthetic pathways differ between Synechococcus temperature ecotypes and that a number of strains have acquired different lipid desaturation capacities through horizontal gene transfer. This work thus includes major new progress in our knowledge of the diversity and evolution of such important biosynthetic pathways. The understanding of these physiological and evolutionary processes is critical to assess how these organisms will respond to a warming planet, given their importance as key marine primary producers at the global scale.