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Hydrogen-based metabolism as an ancestral trait in lineages sibling to the Cyanobacteria. | LitMetric

AI Article Synopsis

Article Abstract

The evolution of aerobic respiration was likely linked to the origins of oxygenic Cyanobacteria. Close phylogenetic neighbors to Cyanobacteria, such as Margulisbacteria (RBX-1 and ZB3), Saganbacteria (WOR-1), Melainabacteria and Sericytochromatia, may constrain the metabolic platform in which aerobic respiration arose. Here, we analyze genomic sequences and predict that sediment-associated Margulisbacteria have a fermentation-based metabolism featuring a variety of hydrogenases, a streamlined nitrogenase, and electron bifurcating complexes involved in cycling of reducing equivalents. The genomes of ocean-associated Margulisbacteria encode an electron transport chain that may support aerobic growth. Some Saganbacteria genomes encode various hydrogenases, and others may be able to use O under certain conditions via a putative novel type of heme copper O reductase. Similarly, Melainabacteria have diverse energy metabolisms and are capable of fermentation and aerobic or anaerobic respiration. The ancestor of all these groups may have been an anaerobe in which fermentation and H metabolism were central metabolic features. The ability to use O as a terminal electron acceptor must have been subsequently acquired by these lineages.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6349859PMC
http://dx.doi.org/10.1038/s41467-018-08246-yDOI Listing

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