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The ability of  Geobacter  species to transfer electrons outside cells enables them to play an important role in biogeochemical and bioenergy processes. Our knowledge of the extracellular electron transfer (EET) process in the genus  Geobacter  is mainly from the study of  G. sulfurreducens , and in order to fully investigate the EET mechanisms in the genus  Geobacter , other  Geobacter  species should also be considered. This study focused on the EET of  Geobacter soli  GSS01, which exhibited a capability of reducing insoluble Fe(III) oxides and generating electrical current comparable with  G. sulfurreducens  PCA. Electrochemical characterization, including cyclic voltammetry, differential pulse voltammetry, and electrochemical  in situ  FTIR spectra, revealed that different redox proteins contributed to the electrochemical behaviors of  G. soli  and  G. sulfurreducens . Based on comparative transcriptomic and proteomic analyses, OmcS was the most upregulated protein in both  G. soli  and  G. sulfurreducens  cells grown with insoluble Fe(III) oxides vs. soluble electron acceptor. However, the proteins including OmcE and PilA that were previously reported as being important for EET in  G. sulfurreducens  were downregulated or unchanged in  G. soli  cells grown with insoluble electron acceptors vs. soluble electron acceptor, and many proteins that were upregulated in  G. soli  cells grown with insoluble electron acceptors vs. soluble electron acceptor, such as OmcN, are not important for EET in  G. sulfurreducens . We also identified 30 differentially expressed small RNAs (sRNAs) in  G. soli  cells grown with different acceptors. Taken together, these findings help to understand the versatile EET mechanisms that exist in the genus  Geobacter  and point to the possibility of sRNA in modulating EET gene expression.

Transcriptomic, Proteomic, and Bioelectrochemical Characterization of an Exoelectrogen Geobacter soli Grown With Different Electron Acceptors