Figure 3
Schematic representation of the proposed photosynthetic electron transport and the proposed ACIII operons. The proposed photosynthetic electron transport in Cfl. aurantiacus (left) and in purple photosynthetic proteobacteria (right) (A), and the proposed ACIII operons in anaerobic photosynthesis (Cp) and aerobic respiration (Cr) in Cfl. aurantiacus, as well as the ACIII operon in Roseiflexus (Rof.) castenholzii (B). The characterized and putative proteins in the ACIII operon are listed as follows: A, multi-heme cytochrome c; B, MoCo Subunit (left) and FeS subunit (right); C, Integral membrane protein (polysulfide reductase, NrfD); D, uncharacterized protein; E, mono-heme cytochrome c; F, integral membrane protein; G, uncharacterized protein; H, electron transport SC01/SenC; J, cytochrome c oxidase subunits I-IV; K, FAD-linked oxidase; L, D-lactate dehydrogenase; and M, Cys and FeS rich domains. Abbreviation: BChl a, bacteriochlorophyll a; QA, QB, Qp, quinone-type molecules.