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  • Title: Generation of zero-valent sulfur from dissimilatory sulfate reduction in sulfate-reducing microorganisms.
    Author: Wang S, Lu Q, Liang Z, Yu X, Lin M, Mai B, Qiu R, Shu W, He Z, Wall JD.
    Journal: Proc Natl Acad Sci U S A; 2023 May 16; 120(20):e2220725120. PubMed ID: 37155857.
    Abstract:
    Dissimilatory sulfate reduction (DSR) mediated by sulfate-reducing microorganisms (SRMs) plays a pivotal role in global sulfur, carbon, oxygen, and iron cycles since at least 3.5 billion y ago. The canonical DSR pathway is believed to be sulfate reduction to sulfide. Herein, we report a DSR pathway in phylogenetically diverse SRMs through which zero-valent sulfur (ZVS) is directly generated. We identified that approximately 9% of sulfate reduction was directed toward ZVS with S8 as a predominant product, and the ratio of sulfate-to-ZVS could be changed with SRMs' growth conditions, particularly the medium salinity. Further coculturing experiments and metadata analyses revealed that DSR-derived ZVS supported the growth of various ZVS-metabolizing microorganisms, highlighting this pathway as an essential component of the sulfur biogeochemical cycle.
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