Figure 3.

A cross-section of the cytoplasmic membrane of S. oneidensis showing the electron pathway for the reduction of CymA. Example pathway starting from formate oxidation (by formate dehydrogenase) to the electron transfer between MQH₂ and CymA, to NapAB. 3D structural cartoons of the Escherichia coli formate dehydrogenase (PDB:1KQG) [56], the Desulfovibrio vulgaris NrfH (PDB:2J7A) [5], and the Shewanella frigidimarina flavocytochrome c₃ (PDB:1Y0P) [6] were rendered with PyMol and the figure compiled in BioRender.com [8].