古细菌
电子受体
产甲烷
甲烷厌氧氧化
化学
无氧呼吸
电子转移
环境化学
硝酸盐
电子传输链
甲烷
细菌
光化学
生态学
生物
生物化学
遗传学
基因
作者
Martyna Głodowska,Cornelia U. Welte,Julia M. Kurth
出处
期刊:Advances in Microbial Physiology
日期:2022-01-01
卷期号:: 157-201
被引量:13
标识
DOI:10.1016/bs.ampbs.2022.01.003
摘要
Methane (CH4) is a potent greenhouse gas significantly contributing to the climate warming we are currently facing. Microorganisms play an important role in the global CH4 cycle that is controlled by the balance between anaerobic production via methanogenesis and CH4 removal via methanotrophic oxidation. Research in recent decades advanced our understanding of CH4 oxidation, which until 1976 was believed to be a strictly aerobic process. Anaerobic oxidation of methane (AOM) coupled to sulfate reduction is now known to be an important sink of CH4 in marine ecosystems. Furthermore, in 2006 it was discovered that anaerobic CH4 oxidation can also be coupled to nitrate reduction (N-DAMO), demonstrating that AOM may be much more versatile than previously thought and linked to other electron acceptors. In consequence, an increasing number of studies in recent years showed or suggested that alternative electron acceptors can be used in the AOM process including FeIII, MnIV, AsV, CrVI, SeVI, SbV, VV, and BrV. In addition, humic substances as well as biochar and perchlorate (ClO4-) were suggested to mediate AOM. Anaerobic methanotrophic archaea, the so-called ANME archaea, are key players in the AOM process, yet we are still lacking deeper understanding of their metabolism, electron acceptor preferences and their interaction with other microbial community members. It is still not clear whether ANME archaea can oxidize CH4 and reduce metallic electron acceptors independently or via electron transfer to syntrophic partners, interspecies electron transfer, nanowires or conductive pili. Therefore, the aim of this review is to summarize and discuss the current state of knowledge about ANME archaea, focusing on their physiology, metabolic flexibility and potential to use various electron acceptors.
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