Journal
FRONTIERS IN MICROBIOLOGY
Volume 13, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fmicb.2022.799859
Keywords
anaerobic oxidation of methane; Fe(III) reduction; ANME archaea; extracellular electron transfer; multiheme c-type cytochromes; methanogen; acetate
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This study reveals that the ANME archaeon Ca. M. nitroreducens TS is capable of carrying out long-term Fe(III)-dependent AOM and may reduce Fe(III) via EET. The decline and replacement of Ca. M. nitroreducens TS by Ca. M. ferrireducens suggests niche differentiation between these two ANME archaea.
Anaerobic methanotrophic (ANME) archaea can drive anaerobic oxidation of methane (AOM) using solid iron or manganese oxides as the electron acceptors, hypothetically via direct extracellular electron transfer (EET). This study investigated the response of Candidatus Methanoperedens nitroreducens TS (type strain), an ANME archaeon previously characterized to perform nitrate-dependent AOM, to an Fe(III)-amended condition over a prolonged period. Simultaneous consumption of methane and production of dissolved Fe(II) were observed for more than 500 days in the presence of Ca. M. nitroreducens TS, indicating that this archaeon can carry out Fe(III)-dependent AOM for a long period. Ca. M. nitroreducens TS possesses multiple multiheme c-type cytochromes (MHCs), suggesting that it may have the capability to reduce Fe(III) via EET. Intriguingly, most of these MHCs are orthologous to those identified in Candidatus Methanoperedens ferrireducens, an Fe(III)-reducing ANME archaeon. In contrast, the population of Ca. M. nitroreducens TS declined and was eventually replaced by Ca. M. ferrireducens, implying niche differentiation between these two ANME archaea in the environment.
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