Schematic of the cellular envelope of Geobacter sulfurreducens. In the process of making energy in the form of ATP, this metal reducing bacteria obtains elections from organic sources (producing CO2 as waste). Electron carrying proteins then transfer the electrons from proteins in the cytoplasm through electron carrier proteins in the inner membrane, periplasm, and outer membrane until the electrons are finally transfered to any available electron acceptor (primarily Fe(III) in natural envrironments).
Predicted flux distribution through central metabolism in G. sulfurreducens during in silico growth with limiting acetate and excess Fe(III)-citrate (growth rate of 0.06 h−1). Red arrows indicate reactions with the greatest flux, and blue arrows indicate reactions with the least flux. Black lines indicate pathways with no associated flux. Flux predictions (in mmol/gdw/h) are listed below enzyme names.