Reconstructing electron transfer components from an Fe(II) oxidizing bacterium

Abhiney Jain, Madison J. Kalb, Jeffrey A. Gralnick

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Neutrophilic Fe(II) oxidizing bacteria play an important role in biogeochemical processes and have also received attention for multiple technological applications. These micro-organisms are thought to couple their metabolism with extracellular electron transfer (EET) while oxidizing Fe(II) as electron donor outside the cell. Sideroxydans lithotrophicus ES-1 is a freshwater chemolithoautotrophic Fe(II) oxidizing bacterium that is challenging to culture and not yet genetically tractable. Analysis of the S. lithotrophicus ES-1 genome predicts multiple EET pathways, which are proposed to be involved in Fe(II) oxidation, but not yet validated. Here we expressed components of two of the proposed EET pathways, including the Mto and Slit_0867–0870 PCC3 pathways, from S. lithotrophicus ES-1 into Aeromonas hydrophila, an established model EET organism. We demonstrate that combinations of putative inner membrane and periplasmic components from the Mto and Slit_0867–0870 PCC3 pathways par-tially complemented EET activity in Aeromonas mutants lacking native components. Our results provide evidence for electron transfer functionality and interactions of inner membrane and periplasmic components from the Mto and Slit_0867–0870 PCC3 pathways. Based on these findings, we suggest that EET in S. lithotrophicus ES-1 could be more complicated than previously considered and raises questions regarding directionality of these electron transfer pathways.

Original languageEnglish (US)
Article number001240
JournalMicrobiology (United Kingdom)
Volume168
Issue number9
DOIs
StatePublished - 2022

Bibliographical note

Publisher Copyright:
© 2022 The Authors.

Keywords

  • Extracellular electron transfer
  • Mto
  • Sideroxydans
  • porin-periplasmicc-type cytochrome complex

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