Abstract:
:Direct electron uptake is emerging as a key process for electron transfer in anaerobic microbial communities, both between species and from extracellular sources, such as zero-valent iron (Fe0 ) or cathodic surfaces. In this study, we investigated cathodic electron uptake by Fe0 -corroding Desulfovibrio ferrophilus IS5 and showed that electron uptake is dependent on direct cell contact via a biofilm on the cathode surface rather than through secreted intermediates. Induction of cathodic electron uptake by lactate-starved D. ferrophilus IS5 cells resulted in the expression of all components necessary for electron uptake; however, protein synthesis was required for full biofilm formation. Notably, proteinase K treatment uncoupled electron uptake from biofilm formation, likely through proteolytic degradation of proteinaceous components of the electron uptake machinery. We also showed that cathodic electron uptake is dependent on SO42- reduction. The insensitivity of Fe0 corrosion to proteinase K treatment suggests that electron uptake from a cathode might involve different mechanism(s) than those involved in Fe0 corrosion.
journal_name
Environ Microbioljournal_title
Environmental microbiologyauthors
McCully AL,Spormann AMdoi
10.1111/1462-2920.15235subject
Has Abstractpub_date
2020-11-01 00:00:00pages
4794-4807issue
11eissn
1462-2912issn
1462-2920journal_volume
22pub_type
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