硫黄
硫酸盐
硫循环
微生物
化学
硫代谢
生物地球化学循环
硫化物
环境化学
生物化学
无机化学
细菌
生物
有机化学
遗传学
作者
Shanquan Wang,Qihong Lu,Zhiwei Liang,Xiaoxiao Yu,Mang Lin,Bi‐Xian Mai,Rongliang Qiu,Wensheng Shu,Zhili He,Judy D. Wall
标识
DOI:10.1073/pnas.2220725120
摘要
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 S 8 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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