SAR92 clade bacteria are potentially important DMSP degraders and sources of climate-active gases in marine environments

He, Xiao-Yan, Liu, Ning-Hua, Liu, Ji-Qing, Peng, Ming, Teng, Zhao-Jie, Gu, Tie-Ji, Chen, Xiu-Lan, Chen, Yin, Wang, Peng, Li, Chun-Yang, Todd, Jonathan D., Zhang, Yu-Zhong and Zhang, Xi-Ying (2023) SAR92 clade bacteria are potentially important DMSP degraders and sources of climate-active gases in marine environments. mBIO, 14 (6). ISSN 2150-7511

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Dimethylsulfoniopropionate (DMSP) is one of Earth’s most abundant organosulfur molecules, which can be catabolized by marine bacteria to release climate-active gases through the cleavage and/or demethylation pathways. The marine SAR92 clade is an abundant oligotrophic group of Gammaproteobacteria in coastal seawater, but their ability to catabolize DMSP is untested. Three SAR92 clade strains isolated from coastal seawater in this study and the SAR92 representative strain HTCC2207 were all shown to catabolize DMSP as a carbon source. All the SAR92 clade strains exhibited DMSP lyase activity producing dimethylsulfide (DMS) and their genomes encoded a ratified DddD DMSP lyase. In contrast, only HTCC2207 and two isolated strains contained the DMSP demethylase dmdA gene and potentially simultaneously demethylated and cleaved DMSP to produce methanethiol (MeSH) and DMS. In SAR92 clade strains with dddD and dmdA, transcription of these genes was inducible by DMSP substrate. Bioinformatic analysis indicated that SAR92 clade bacteria containing and transcribing DddD and DmdA were widely distributed in global oceans, especially in polar regions. This study highlights the SAR92 clade of oligotrophic bacteria as potentially important catabolizers of DMSP and sources of the climate-active gases MeSH and DMS in marine environments, particularly in polar regions.

Item Type: Article
Uncontrolled Keywords: sdg 13 - climate action,sdg 14 - life below water ,/dk/atira/pure/sustainabledevelopmentgoals/climate_action
Faculty \ School: Faculty of Science > School of Biological Sciences
UEA Research Groups: Faculty of Science > Research Groups > Molecular Microbiology
Depositing User: LivePure Connector
Date Deposited: 04 Mar 2024 18:38
Last Modified: 04 Mar 2024 18:38
DOI: 10.1128/mbio.01467-23


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