Methane-Dependent Extracellular Electron Transfer at the Bioanode by the Anaerobic Archaeal Methanotroph "Candidatus Methanoperedens".

ABSTRACT: Anaerobic methanotrophic (ANME) archaea have recently been reported to be capable of using insoluble extracellular electron acceptors via extracellular electron transfer (EET). In this study, we investigated EET by a microbial community dominated by "Candidatus Methanoperedens" archaea at the anode of a bioelectrochemical system (BES) poised at 0 V vs. standard hydrogen electrode (SHE), in this way measuring current as a direct proxy of EET by this community. After inoculation of the BES, the maximum current density was 274 mA m^-2 (stable current up to 39 mA m^-2). Concomitant conversion of ¹³CH₄ into ¹³CO₂ demonstrated that current production was methane-dependent, with 38% of the current attributed directly to

SUBMITTER: Ouboter HT 

PROVIDER: S-EPMC9039326 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature