A deep‐sea sulfate‐reducing bacterium generates zero‐valent sulfur via metabolizing thiosulfate  

作　　者：Rui Liu Yeqi Shan Shichuan Xi Xin Zhang Chaomin Sun 

机构地区：[1]CAS and Shandong Province Key Laboratory of Experimental Marine Biology,Center of Deep Sea Research,Institute of Oceanology,Chinese Academy of Sciences,Qingdao,China [2]Laboratory for Marine Biology and Biotechnology,Qingdao National Laboratory for Marine Science and Technology,Qingdao,China [3]Center of Ocean Mega‐Science,Chinese Academy of Sciences,Qingdao,China [4]College of Earth Science,University of Chinese Academy of Sciences,Beijing,China [5]CAS Key Laboratory of Marine Geology and Environment,Center of Deep Sea Research,Institute of Oceanology,Chinese Academy of Sciences,Qingdao,China

出　　处：《mLife》2022年第3期257-271,共15页微生物（英文）

基　　金：This study was financially supported by the Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology(Qingdao)(Grant No.2022QNLM050102‐3);China Ocean Mineral Resources R&D Association Grant(Grant No.DY135‐B2‐14);Shandong Provincial Natural Science Foundation(ZR2021ZD28);Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA22050301);Major Research Plan of the National Natural Science Foundation(Grant No.92051107);Key Deployment Projects of Center of Ocean Mega‐Science of the Chinese Academy of Sciences(Grant No.COMS2020Q04)for Chaomin Sun.

摘　　要：Zero‐valent sulfur(ZVS)is a crucial intermediate in the sulfur geobiochemical circulation and is widespread in deep‐sea cold seeps.Sulfur‐oxidizing bacteria are thought to be the major contributors to the formation of ZVS.However,ZVS production mediated by sulfate‐reducing bacteria(SRB)has rarely been reported.In this study,we isolated and cultured a typical SRB designated Oceanidesulfovibrio marinus CS1 from deep‐sea cold seep sediment in the South China Sea.We show that O.marinus CS1 forms ZVS in the medium supplemented with thiosulfate.Proteomic and protein activity assays revealed that thiosulfate reductase(PhsA)and the sulfide:quinone oxidoreductase(SQR)played key roles in driving ZVS formation in O.marinus CS1.During this process,thiosulfate firstly was reduced by PhsA to form sulfide,then sulfide was oxidized by SQR to produce ZVS.The expressions of PhsA and SQR were significantly upregulated when O.marinus CS1 was cultured in a deep‐sea cold seep,strongly indicating that strain CS1 might form ZVS in the deep‐sea environment.Notably,homologs of phsA and sqr were widely identified from microbes living in sediments of deep‐sea cold seep in the South China Sea by the metagenomic analysis.We thus propose that SRB containing phsA and sqr genes potentially contribute to the formation of ZVS in deep‐sea cold seep environments.

关 键 词：cold seep in situ sulfate reducing bacteria sulfide oxidation zero‐valent sulfur 

分 类 号：Q93[生物学—微生物学]