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A mechanism for bacterial transformation of dimethylsulfide to dimethylsulfoxide: a missing link in the marine organic sulfur cycle

文献类型： 外文期刊

作者： Lidbury, Ian 1 ; Krober, Eileen 1 ; Zhang, Zhidong 2 ; Zhu, Yijun 1 ; Murrell, J. Colin 3 ; Chen, Yin 1 ; Schafer, Hen 1 ;

作者机构： 1.Univ Warwick, Sch Life Sci, Gibbet Hill Campus, Coventry CV4 7AL, W Midlands, England

2.Xinjiang Acad Agr Sci, Inst Microbiol, Urumqi 830091, Peoples R China

3.Univ East Anglia, Sch Environm Sci, Norwich Res Pk, Norwich NR4 7TJ, Norfolk, England

期刊名称：ENVIRONMENTAL MICROBIOLOGY （ 影响因子：5.491； 五年影响因子：6.438 ）

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收录情况： SCI

摘要： The volatile organosulfur compound, dimethylsulfide (DMS), plays an important role in climate regulation and global sulfur biogeochemical cycles. Microbial oxidation of DMS to dimethylsulfoxide (DMSO) represents a major sink of DMS in surface seawater, yet the underlying molecular mechanisms and key microbial taxa involved are not known. Here, we reveal that Ruegeria pomeroyi, a model marine heterotrophic bacterium, can oxidize DMS to DMSO using trimethylamine monooxygenase (Tmm). Purified Tmm oxidizes DMS to DMSO at a 1:1 ratio. Mutagenesis of the tmm gene in R. pomeroyi completely abolished DMS oxidation and subsequent DMSO formation. Expression of Tmm and DMS oxidation in R. pomeroyi is methylamine-dependent and regulated at the post-transcriptional level. Considering that Tmm is present in approximately 20% of bacterial cells inhabiting marine surface waters, particularly the marine Roseobacter clade and the SAR11 clade, our observations contribute to a mechanistic understanding of biological DMSO production in surface seawater.

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