Overview of the metabolism of S. aciditrophicus. Overview of the metabolism of S. aciditrophicus. Pathways for aromatic and fatty acid degradation are shown in black, key biosynthetic steps are shown in blue, primary ion translocation pumps are in green, and electron transfer complexes are in orange. Membrane complexes involved in energy transduction and electron transport are arranged along the cellular membrane (CM). OM, outer membrane; pit, phosphate inorganic transport system; ETF, electron transfer flavoprotein; Me+, ion translocated by the RnF-like complex. McInerney M J et al. PNAS 2007;104:7600-7605 ©2007 by National Academy of Sciences