B. Inorganic sulfur metabolism of green sulfur bacteria






Overview of known and hypothesized pathways of electronand inorganic sulfur compounds in Chlorobaculum tepidum.

Thin arrows indicate pathways of e-, and thick ones, metabolic or transport pathways of substrates/products. ? hypothetical, Apr adenosine 50-phosphosulfate reductase, APS adenosine 5’-phosphosulfate, c cytochrome c with thewavelength (nm) of the a-band of the reduced form, cyt b/ISP cyt b/Rieske-type ISP complex, Dsb homologues encoded by genes in thedsb gene cluster encoding thiol:disulfide interchange proteins, Dsrproteins encoded by genes in the dsr gene cluster encoding dissimilatory sulfite reductase proteins, FCSD flavocytochrome c sulfide dehydrogenase, Fd ferredoxin, FNR ferrodoxin-NAD(P)?/NAD(P)H oxidoreductase, IM inner membrane, MQ menaquinone, OM outer membrane, Qmo quinone oxidizing membrane protein, R1,2,3 hypothetical thiol, RC reaction center, [S0] the zero-valence sulfur or the equivalent (sulfur atom in organic and inorganic polysulfide, elemental sulfur), Sox proteins encoded by genes in the sox gene cluster, SQR sulfide-quinone reductase, TOMES thiosulfate oxidizing multi-enzyme system.
(adapted from Sakurai et al. (2010) Photosynthesis Res. 104:163–176




C. Electron transport pathway of green sulfur bacteria