Mechanisms of extracellular electron transfer in anaerobic methanotrophic archaea

Heleen T. Ouboter, Rob Mesman, Tom Sleutels, Jelle Postma, Martijn Wissink, Mike S. M. Jetten, Annemiek Ter Heijne, Tom Berben and Cornelia U. Welte ()
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Heleen T. Ouboter: Radboud University
Rob Mesman: Radboud University
Tom Sleutels: European Centre of Excellence for Sustainable Water Technology
Jelle Postma: Radboud University
Martijn Wissink: Radboud University
Mike S. M. Jetten: Radboud University
Annemiek Ter Heijne: Wageningen University & Research
Tom Berben: Radboud University
Cornelia U. Welte: Radboud University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Anaerobic methanotrophic (ANME) archaea are environmentally important, uncultivated microorganisms that oxidize the potent greenhouse gas methane. During methane oxidation, ANME archaea engage in extracellular electron transfer (EET) with other microbes, metal oxides, and electrodes through unclear mechanisms. Here, we cultivate ANME-2d archaea (‘Ca. Methanoperedens’) in bioelectrochemical systems and observe strong methane-dependent current (91–93% of total current) associated with high enrichment of ‘Ca. Methanoperedens’ on the anode (up to 82% of the community), as determined by metagenomics and transmission electron microscopy. Electrochemical and metatranscriptomic analyses suggest that the EET mechanism is similar at various electrode potentials, with the possible involvement of an uncharacterized short-range electron transport protein complex and OmcZ nanowires.

Date: 2024
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DOI: 10.1038/s41467-024-45758-2

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