Bacteria are important dimethylsulfoniopropionate producers in marine aphotic and high-pressure environments
Bacteria are important dimethylsulfoniopropionate producers in marine aphotic and high-pressure environments
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细菌是海洋无光和高压环境中重要的二甲基磺基丙酸盐生产者
DOI：
10.1038/s41467-020-18434-4
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发表时间：
2020
影响因子：
16.6
通讯作者：
Xiaohua Zhang
中科院分区：
文献类型：
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作者：
Yanfen Zheng;Jinyan Wang;Shun Zhou;Yunhui Zhang;Ji Liu;Chunxu Xue;Beth T. Williams;Xiuxiu Zhao;Li Zhao;Xiaoyu Zhu;Chuang Sun;Honghai Zhang;Tian Xiao;Guipeng Yang;Jonathan D. Todd;Xiaohua Zhang
二甲基磺酰基丙酸酯（DMSP）是一种重要的海洋渗透剂。无光环境直到最近才被认为是全球 DMSP 生产的潜在贡献者。在此，我们的马里亚纳海沟研究揭示了典型的海水 DMSP/二甲基硫醚 (DMS) 分布，其中在富光区浓度最高，而在其下方浓度虽有所下降但保持一致。通过 dsyB 基因及其转录进行细菌 DMSP 合成的遗传潜力在深海中更大，并且在沉积物中最高。DMSP 分解代谢潜力存在于整个海沟水域，但在 8000 m 以下不太明显，这可能表明偏好将 DMSP 存储在深海以进行应激保护。深海细菌分离株在增加的静水压力下显示出增强的 DMSP 产量。此外，细菌 dsyB 突变体对深海压力的耐受性低于野生型菌株。因此，我们提出 DMSP 在静水压保护中的生理功能，并且细菌是深海水和沉积物中 DMSP 的关键生产者。
Dimethylsulfoniopropionate (DMSP) is an important marine osmolyte. Aphotic environments are only recently being considered as potential contributors to global DMSP production. Here, our Mariana Trench study reveals a typical seawater DMSP/dimethylsulfide (DMS) profile, with highest concentrations in the euphotic zone and decreased but consistent levels below. The genetic potential for bacterial DMSP synthesis via the dsyB gene and its transcription is greater in the deep ocean, and is highest in the sediment.s DMSP catabolic potential is present throughout the trench waters, but is less prominent below 8000 m, perhaps indicating a preference to store DMSP in the deep for stress protection. Deep ocean bacterial isolates show enhanced DMSP production under increased hydrostatic pressure. Furthermore, bacterial dsyB mutants are less tolerant of deep ocean pressures than wild-type strains. Thus, we propose a physiological function for DMSP in hydrostatic pressure protection, and that bacteria are key DMSP producers in deep seawater and sediment.