Bacterial taxa that limit sulfur flux from the ocean
Bacterial taxa that limit sulfur flux from the ocean
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DOI：
10.1126/science.1130657
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发表时间：
2006-10-27
期刊：
影响因子：
56.9
通讯作者：
Moran, Mary Ann
中科院分区：
文献类型：
--
作者：
Howard, Erinn C.;Henriksen, James R.;Moran, Mary Ann
来自海洋表面水域的二甲基硫醚 (DMS) 是大气中硫的主要天然来源，并通过气溶胶的形成影响气候。海洋浮游细菌通过将前体二甲基磺酰基丙酸酯 (DMSP) 转化为 DMS 或不具有气候活性的硫化合物来调节硫通量。通过发现具有 DMSP 甲基转移酶活性的甘氨酸裂解 T 家族蛋白，玫瑰杆菌和 SAR11 分类群中的海洋浮游细菌被确定为 DMSP 去甲基化为甲基硫基丙酸的主要介质。三分之一的海洋表面细菌含有 DMSP 去甲基酶同源物，从而将全球海洋初级生产的很大一部分从 DMS 形成过程转移到海洋微生物食物网中。
Flux of dimethylsulfide (DMS) from ocean surface waters is the predominant natural source of sulfur to the atmosphere and influences climate by aerosol formation. Marine bacterioplankton regulate sulfur flux by converting the precursor dimethylsulfoniopropionate (DMSP) either to DMS or to sulfur compounds that are not climatically active. Through the discovery of a glycine cleavage T-family protein with DMSP methyltransferase activity, marine bacterioplankton in the Roseobacter and SAR11 taxa were identified as primary mediators of DMSP demethylation to methylmercaptopropionate. One-third of surface ocean bacteria harbor a DMSP demethylase homolog and thereby route a substantial fraction of global marine primary production away from DMS formation and into the marine microbial food web.