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Anaerobic oxidation of methane mediated by microbial extracellular respiration
Environmental Microbiology Reports ( IF 3.3 ) Pub Date : 2021-09-15 , DOI: 10.1111/1758-2229.13008
Xueqin Zhang 1 , Zhiguo Yuan 1 , Shihu Hu 1
Affiliation  

Anaerobic oxidation of methane (AOM) can be microbially mediated by the reduction of different terminal electron acceptors. AOM coupled to reduction of sulfate, manganese/iron oxides, humic substances, selenate, arsenic and other artificial extracellular electron acceptors are recognized as processes associated with microbial extracellular respiration. In these processes, methane-oxidizing archaea transfer electrons to external electron acceptors or to interdependent microbial species, which are mechanistically dependent on versatile extracellular electron transfer (EET) pathways. This review compiles recent progress in the research of electromicrobiology of AOM based on the catalogue of different electron acceptors. Naturally distributed and artificially constructed EET-mediated AOM is summarized, with the discussion of their environmental importance and application potentials. The diversity of responsible microorganisms involved in EET-mediated AOM is discussed with both methane-oxidizing archaea and their putative bacterial partners. More importantly, the review highlights progress and deficiencies in our understanding of EET pathways in EET-mediated AOM, raising open research questions for future research.

中文翻译:

微生物细胞外呼吸介导的甲烷厌氧氧化

甲烷的厌氧氧化 (AOM) 可以通过不同末端电子受体的还原进行微生物介导。AOM 与硫酸盐、锰/铁氧化物、腐殖质、硒酸盐、砷和其他人工细胞外电子受体的还原相结合被认为是与微生物细胞外呼吸相关的过程。在这些过程中,甲烷氧化古菌将电子转移到外部电子受体或相互依赖的微生物物种,这些微生物在机械上依赖于多种细胞外电子转移 (EET) 途径。本综述根据不同电子受体的目录汇总了AOM电微生物学研究的最新进展。总结了自然分布和人工构建的 EET 介导的 AOM,讨论它们的环境重要性和应用潜力。与甲烷氧化古细菌及其假定的细菌伙伴一起讨论了参与 EET 介导的 AOM 的负责任微生物的多样性。更重要的是,该评论突出了我们对 EET 介导的 AOM 中 EET 途径的理解的进展和不足,为未来的研究提出了开放的研究问题。
更新日期:2021-11-23
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