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- W3112346581 abstract "Abstract BackgroundThe widespread occurrence of sulfate-reducing microorganisms (SRMs, which are typically considered anaerobic organisms) in temporarily oxic/hypoxic aquatic environments indicates an intriguing possibility that SRMs can prevail in continuously oxic/hypoxic terrestrial environments rich in sulfate. However, little attention has been paid to such a possibility, leading to an incomplete understanding of microorganisms driving terrestrial part of the global sulphur cycle.ResultsIn this study, genome-centric metagenomics was employed to explore SRMs in a revegetated acidic mine wasteland under continuously oxic/hypoxic conditions. We reconstructed 12 Acidobacteria and four Deltaproteobacteria genomes encoding reductive DsrAB, of which five represented three new SRM genera. Our results showed that Acidobacteria -related SRMs differed considerably from Deltaproteobacteria -related SRMs in metabolic potentials. Genomes of Acidobacteria -related SRMs harbored more glycoside hydrolase (GH) genes than those of previously known SRMs. They also tended to encode more oxygen-tolerant hydrogenases and cytochrome c oxidases, but less methyl-accepting chemotaxis proteins (MCPs) than genomes of Deltaproteobacteria -related SRMs. More importantly, we discovered that SRM-infecting viruses can contribute to glycoside hydrolysis, chemotaxis and antioxidation of their hosts. Remarkably, one GH encoded by a SRM-infecting virus is responsible for the liberation of rhamnose (a monosaccharide that is accessible directly to SRMs for dissimilatory sulfate reduction) from plant cell-wall-derived oligosaccharides.ConclusionsTaken together, our results do not only improve our understanding of microorganisms driving dissimilatory sulfate reduction in terrestrial environments under continuously oxic/hypoxic conditions but also provides the first evidence for putative roles of viruses in S biogeochemical cycle in terrestrial ecosystems." @default.
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- W3112346581 date "2020-10-21" @default.
- W3112346581 modified "2023-09-26" @default.
- W3112346581 title "Metagenomic insights into sulfate-reducing bacteria in a revegetated acidic mine wasteland" @default.
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- W3112346581 doi "https://doi.org/10.21203/rs.3.rs-92205/v1" @default.
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