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• W2970203766 abstract "Cyanobacterial diazotrophs are considered to be the most important source of fixed N 2 in the open ocean. Biological N 2 fixation is catalyzed by the extremely O 2 -sensitive nitrogenase enzyme. In cyanobacteria without specialized N 2 -fixing cells (heterocysts), mechanisms such as decoupling photosynthesis from N 2 fixation in space or time are involved in protecting nitrogenase from the intracellular O 2 evolved by photosynthesis. However, it is not known how cyanobacterial cells limit O 2 diffusion across their membranes to protect nitrogenase in ambient O 2 -saturated surface ocean waters. Here, we explored all known genomes of the major marine cyanobacterial lineages for the presence of hopanoid synthesis genes, since hopanoids are a class of lipids that might act as an O 2 diffusion barrier. We found that, whereas all non−heterocyst-forming cyanobacterial diazotrophs had hopanoid synthesis genes, none of the marine Synechococcus , Prochlorococcus (non−N 2 -fixing), and marine heterocyst-forming (N 2 -fixing) cyanobacteria did. Finally, we conclude that hopanoid-enriched membranes are a conserved trait in non−heterocyst-forming cyanobacterial diazotrophs that might lower the permeability to extracellular O 2 . This membrane property coupled with high respiration rates to decrease intracellular O 2 concentration may therefore explain how non−heterocyst-forming cyanobacterial diazotrophs can fix N 2 in the fully oxic surface ocean." @default.
• W2970203766 created "2019-09-05" @default.
• W2970203766 creator A5037017115 @default.
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• W2970203766 date "2019-08-26" @default.
• W2970203766 modified "2023-10-16" @default.
• W2970203766 title "Hopanoid lipids may facilitate aerobic nitrogen fixation in the ocean" @default.
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• W2970203766 doi "https://doi.org/10.1073/pnas.1908165116" @default.
• W2970203766 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6744863" @default.
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