The Enzyme Database

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Accepted name: bacterial sulfide:quinone reductase
Reaction: n HS- + n quinone = polysulfide + n quinol
Other name(s): sqr (gene name); sulfide:quinone reductase (ambiguous); sulfide:quinone oxidoreductase
Systematic name: sulfide:quinone oxidoreductase (polysulfide-producing)
Comments: Contains FAD. Ubiquinone, plastoquinone or menaquinone can act as acceptor in different species. In some organisms the enzyme catalyses the formation of sulfur globules. It repeats the catalytic cycle without releasing the product, producing a polysulfide of up to 10 sulfur atoms. The reaction stops when the maximum length of the polysulfide that can be accommodated in the sulfide oxidation pocket is achieved. The enzyme also plays an important role in anoxygenic bacterial photosynthesis. cf. EC, sulfide quinone oxidoreductase.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB
1.  Arieli, B., Shahak, Y., Taglicht, D., Hauska, G. and Padan, E. Purification and characterization of sulfide-quinone reductase, a novel enzyme driving anoxygenic photosynthesis in Oscillatoria limnetica. J. Biol. Chem. 269 (1994) 5705–5711. [PMID: 8119908]
2.  Reinartz, M., Tschape, J., Bruser, T., Truper, H.G. and Dahl, C. Sulfide oxidation in the phototrophic sulfur bacterium Chromatium vinosum. Arch. Microbiol. 170 (1998) 59–68. [PMID: 9639604]
3.  Nubel, T., Klughammer, C., Huber, R., Hauska, G. and Schutz, M. Sulfide:quinone oxidoreductase in membranes of the hyperthermophilic bacterium Aquifex aeolicus (VF5). Arch. Microbiol. 173 (2000) 233–244. [PMID: 10816041]
4.  Brito, J.A., Sousa, F.L., Stelter, M., Bandeiras, T.M., Vonrhein, C., Teixeira, M., Pereira, M.M. and Archer, M. Structural and functional insights into sulfide:quinone oxidoreductase. Biochemistry 48 (2009) 5613–5622. [DOI] [PMID: 19438211]
5.  Cherney, M.M., Zhang, Y., Solomonson, M., Weiner, J.H. and James, M.N. Crystal structure of sulfide:quinone oxidoreductase from Acidithiobacillus ferrooxidans: insights into sulfidotrophic respiration and detoxification. J. Mol. Biol. 398 (2010) 292–305. [DOI] [PMID: 20303979]
6.  Marcia, M., Langer, J.D., Parcej, D., Vogel, V., Peng, G. and Michel, H. Characterizing a monotopic membrane enzyme. Biochemical, enzymatic and crystallization studies on Aquifex aeolicus sulfide:quinone oxidoreductase. Biochim. Biophys. Acta 1798 (2010) 2114–2123. [DOI] [PMID: 20691146]
7.  Xin, Y., Liu, H., Cui, F., Liu, H. and Xun, L. Recombinant Escherichia coli with sulfide:quinone oxidoreductase and persulfide dioxygenase rapidly oxidises sulfide to sulfite and thiosulfate via a new pathway. Environ. Microbiol. 18 (2016) 5123–5136. [PMID: 27573649]
[EC created 2011, modified 2017, modified 2019]

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