2008
DOI: 10.1128/jb.00634-08
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SoxAX Binding Protein, a Novel Component of the Thiosulfate-Oxidizing Multienzyme System in the Green Sulfur Bacterium Chlorobium tepidum

Abstract: From the photosynthetic green sulfur bacterium Chlorobium tepidum (pro synon. Chlorobaculum tepidum), we have purified three factors indispensable for the thiosulfate-dependent reduction of the small, monoheme cytochrome c 554 . These are homologues of sulfur-oxidizing (Sox) system factors found in various thiosulfate-oxidizing bacteria. The first factor is SoxYZ that serves as the acceptor for the reaction intermediates. The second factor is monomeric SoxB that is proposed to catalyze the hydrolytic cleavage … Show more

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Cited by 37 publications
(57 citation statements)
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“…Thiosulfate oxidation in C. tepidum is performed by the SOX system (Azai et al, 2009;Ogawa et al, 2008), but is inhibited in the presence of sulfide (Chan et al, 2008b). In our C. tepidum wild-type cultures, thiosulfate accumulated under sulfide-oxidizing conditions and was subsequently consumed when sulfide was depleted (Fig.…”
Section: Thiosulfate Formationmentioning
confidence: 99%
See 1 more Smart Citation
“…Thiosulfate oxidation in C. tepidum is performed by the SOX system (Azai et al, 2009;Ogawa et al, 2008), but is inhibited in the presence of sulfide (Chan et al, 2008b). In our C. tepidum wild-type cultures, thiosulfate accumulated under sulfide-oxidizing conditions and was subsequently consumed when sulfide was depleted (Fig.…”
Section: Thiosulfate Formationmentioning
confidence: 99%
“…In C. tepidum, the membrane-bound SQR homologues CT0117 and CT1087 are responsible for some of the sulfide oxidation activity in the cells (Chan et al, 2009). Thiosulfate oxidation in GSB is carried out by the sulfuroxidizing (SOX) system in a manner similar to that in A. vinosum (Azai et al, 2009;Ogawa et al, 2008). In the proposed pathway the sulfone moiety of thiosulfate is oxidized to sulfate and released, whereas the sulfane moiety is released to the putative pool of sulfur globule precursors and subsequently either deposited in sulfur globules or oxidized to sulfite by the dsr system (Fig.…”
Section: Holkenbrink and Othersmentioning
confidence: 99%
“…The soxK gene occurs within the sox cluster of some bacteria, such as Chlorobiaceae 11,12) and Chromatiaceae, but does not appear to occur in the genomes of bacteria such as P. pantotrophus and S. novella. 20) SoxK from C. tepidum was found to participate in binding and enhancing of the function of SoxA and SoxX, and hence was designated SAXB (SoxAX binding protein). 20) The soxF and soxE genes encode the homologs of flavoprotein and the cytochrome moiety respectively of the dimeric flavocytochrome c (FCSD or FCC) complex, 2,18) which has been reported to act as a sulfide dehydrogenase in Chlorobium limicola f. sp.…”
mentioning
confidence: 99%
“…20) SoxK from C. tepidum was found to participate in binding and enhancing of the function of SoxA and SoxX, and hence was designated SAXB (SoxAX binding protein). 20) The soxF and soxE genes encode the homologs of flavoprotein and the cytochrome moiety respectively of the dimeric flavocytochrome c (FCSD or FCC) complex, 2,18) which has been reported to act as a sulfide dehydrogenase in Chlorobium limicola f. sp. thiosulfatophilum.…”
mentioning
confidence: 99%
“…This is the same as free-living, symbiotic (Kleiner et al, 2012a;Muyzer et al, 2011a,b) and phototrophic SOB (Friedrich et al, 2005;Ogawa et al, 2008). The complete Sox system yields 8 electrons per thiosulfate molecule, but the loss of the soxCD enzyme results in just 2 electrons being generated and the formation of sulfur globules (Fazzini et al, 2013).…”
Section: Chemoautotrophic Metabolismmentioning
confidence: 78%