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. 2020 Jan 10;10:2997. doi: 10.3389/fmicb.2019.02997

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Copyright © 2020 Philips.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Schematic overview of the different EET mechanisms that have been proposed for the uptake of electrons from a cathode or Fe(0) by acetogenic bacteria (adjusted from Philips et al., 2019). Previously proposed EET mechanisms are direct (A), mediated by dissolved redox mediators (B), depended on H₂ generation by a syntrophic partner with a direct mechanism (C), or depended on H₂ generation catalyzed by extracellular hydrogenases (D). The last mechanism (E) is proposed and elaborated in this work.