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An S-methyltransferase that produces the climate-active gas dimethylsulfide is widespread across diverse marine bacteria

文献类型： 外文期刊

作者： Zhang, Yunhui;Sun, Chuang;Guo, Zihua;Liu, Liyan;Zhang, Xiaotong;Sun, Kai;Zheng, Yanfen;Gates, Andrew J.;Todd, Jonathan D.;Zhang, Xiao-Hua

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期刊名称： NATURE MICROBIOLOGY

ISSN： 2058-5276

年卷期： 2024 年

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收录情况： SCIE（2024版）

摘要： Hydrogen sulfide (H2S), methanethiol (MeSH) and dimethylsulfide (DMS) are abundant sulfur gases with roles in biogeochemical cycling, chemotaxis and/or climate regulation. Catabolism of the marine osmolyte dimethylsulfoniopropionate (DMSP) is a major source of DMS and MeSH, but both also result from S-methylation of H2S via MddA, an H2S and MeSH S-methyltransferase whose gene is abundant in soil but scarce in marine environments. Here we identify the S-adenosine methionine (SAM)-dependent MeSH and H2S S-methyltransferase 'MddH', which is widespread in diverse marine bacteria and some freshwater and soil bacteria. mddH is predicted in up to similar to 5% and similar to 15% of seawater and coastal sediment bacteria, respectively, which is considerably higher than mddA. Furthermore, marine mddH transcript levels are similar to those for the most abundant DMSP lyase gene dddP. This study implies that the importance of H2S and MeSH S-methylation pathways in marine environments is significantly underestimated.

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