an intertwined evolutionary history of methanogenic archaea and sulfate reduction一个错综复杂的进化历史的产甲烷古菌和硫酸盐还原.pdfVIP
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an intertwined evolutionary history of methanogenic archaea and sulfate reduction一个错综复杂的进化历史的产甲烷古菌和硫酸盐还原
An Intertwined Evolutionary History of Methanogenic
Archaea and Sulfate Reduction
Dwi Susanti1,2, Biswarup Mukhopadhyay1,3,4*
1Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, Virginia, United States of America, 2 Genetics, Bioinformatics and Computational Biology Ph.D Program,
Virginia Tech, Blacksburg, Virginia, United States of America, 3 Departments of Biochemistry, Virginia Tech, Blacksburg, Virginia, United States of America, 4 Biological
Sciences, Virginia Tech, Blacksburg, Virginia, United States of America
Abstract
Hydrogenotrophic methanogenesis and dissimilatory sulfate reduction, two of the oldest energy conserving respiratory
systems on Earth, apparently could not have evolved in the same host, as sulfite, an intermediate of sulfate reduction,
inhibits methanogenesis. However, certain methanogenic archaea metabolize sulfite employing a deazaflavin cofactor
(F420)-dependent sulfite reductase (Fsr) where N- and C-terminal halves (Fsr-N and Fsr-C) are homologs of F420 H2
dehydrogenase and dissimilatory sulfite reductase (Dsr), respectively. From genome analysis we found that Fsr was likely
assembled from freestanding Fsr-N homologs and Dsr-like proteins (Dsr-LP), both being abundant in methanogens. Dsr-LPs
fell into two groups defined by following sequence features: Group I (simplest), carrying a coupled siroheme-[Fe -S ] cluster
4 4
and sulfite-binding Arg/Lys residues; Group III (most complex), with group I features, a Dsr-type peripheral [Fe -S ] cluster
4 4
and an additional [Fe -S
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