Extracellular Electron Exchange Capabilities of and .

TitleExtracellular Electron Exchange Capabilities of and .
Publication TypeJournal Article
Year of Publication2021
AuthorsLiang D, Liu X, Woodard TL, Holmes DE, Smith JA, Nevin KP, Feng Y, Lovley DR
JournalEnviron Sci Technol
Date Published2021 Dec 07
KeywordsDesulfovibrio, Electron Transport, Electrons, Ferric Compounds, Geobacter, Oxidation-Reduction

Microbial extracellular electron transfer plays an important role in diverse biogeochemical cycles, metal corrosion, bioelectrochemical technologies, and anaerobic digestion. Evaluation of electron uptake from pure Fe(0) and stainless steel indicated that, in contrast to previous speculation in the literature, and are not able to directly extract electrons from solid-phase electron-donating surfaces. grew with Fe(III) as the electron acceptor, but did not. reduced Fe(III) oxide occluded within porous alginate beads, suggesting that it released a soluble electron shuttle to promote Fe(III) oxide reduction. Conductive atomic force microscopy revealed that the pili are electrically conductive and the expression of a gene encoding an aromatics-rich putative pilin was upregulated during growth on Fe(III) oxide. The expression of genes for multi-heme -type cytochromes was not upregulated during growth with Fe(III) as the electron acceptor, and genes for a porin-cytochrome conduit across the outer membrane were not apparent in the genome. The results suggest that has adopted a novel combination of strategies to enable extracellular electron transport, which may be of biogeochemical and technological significance.

Alternate JournalEnviron Sci Technol
PubMed ID34748326