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      Metabolic diversification of anaerobic methanotrophic archaea in a deep-sea cold seep

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          Abstract

          Anaerobic methanotrophic archaea (ANME) can assimilate methane and govern the greenhouse effect of deep-sea cold seeps. In this study, a total of 13 ANME draft genomes representing five ANME types (ANME-1a, ANME-1b, ANME-2a, ANME-2b and ANME-2c), in size between 0.8 and 1.8 Mbp, were obtained from the Jiaolong cold seep in the South China Sea. The small metagenome-assembled genomes (MAGs) contained all the essential pathways for methane oxidization and carbon dioxide fixation. All genes related to nitrate and sulfate reduction were absent from the MAGs, indicating their syntrophic dependence on partner organisms. Aside from acetate secretion and sugar storage, propanoate synthesis pathway, as an alternative novel carbon flow, was identified in all the MAGs and transcriptionally active. Regarding type-specific features of the MAGs, the genes encoding archaellum and bacteria-derived chemotaxis were specific to ANME-2, perhaps for fitness under fluctuation of methane and sulfate concentration flux. Our genomic and transcriptomic results strongly suggested that ANME could carry out simple carbon metabolism from C1 assimilation to C3 biosynthesis in the SCS cold seep, which casts light on a novel approach for synthetic biology.

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          Author and article information

          Journal
          MLST
          Marine Life Science & Technology
          Springer (China )
          2096-6490
          2662-1746
          01 November 2020
          26 August 2020
          : 2
          : 4
          : 431-441
          Affiliations
          1Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China
          2HKUST-CAS Sanya Joint Laboratory of Marine Science Research, Chinese Academy of Sciences, Sanya 572000, China
          Author notes
          *Corresponding author: Yong Wang, E-mail: wangy@ 123456idsse.ac.cn
          Article
          s42995-020-00057-9
          10.1007/s42995-020-00057-9
          © 2020 The Author(s)

          This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 Unported License (CC BY-NC 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See https://creativecommons.org/licenses/by-nc/4.0/.

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          Self URI (journal-page): https://www.springer.com/journal/42995
          Categories
          Research Papers

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