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Literature summary for 1.8.5.3 extracted from

  • Adams, B.; Smith, A.T.; Bailey, S.; McEwan, A.G.; Bray, R.C.
    Reactions of dimethylsulfoxide reductase from Rhodobacter capsulatus with dimethyl sulfide and with dimethyl sulfoxide: complexities revealed by conventional and stopped-flow spectrophotometry (1999), Biochemistry, 38, 8501-8511.
    View publication on PubMed

Organism

Organism UniProt Comment Textmining
Rhodobacter capsulatus
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-
-

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
dimethylsulfide + H2O + oxidized benzyl viologen
-
Rhodobacter capsulatus dimethylsulfoxide + reduced benzyl viologen
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r
dimethylsulfide + H2O + oxidized methyl viologen
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Rhodobacter capsulatus dimethylsulfoxide + reduced methyl viologen
-
r
dimethylsulfoxide + reduced benzyl viologen
-
Rhodobacter capsulatus dimethylsulfide + H2O + oxidized benzyl viologen
-
r
dimethylsulfoxide + reduced methyl viologen
-
Rhodobacter capsulatus dimethylsulfide + H2O + oxidized methyl viologen
-
r
additional information Second-order rate constants for the two-electron reduction and reoxidation reactions at pH 5.5 are 190000 and 430 per M and s, respectively, while at pH 8.0, the catalytic step is rate-limiting. Kinetically, for the two-electron reactions, the enzyme is more effective in dimethylsulfide oxidation than in dimethylsulfoxide reduction. Reduction of DMSOR by dimethylsulfide is incomplete below 1 mM dimethylsulfide but complete at higher concentrations. Reoxidation of the dimethylsulfide-reduced state by dimethylsulfoxide is always incomplete Rhodobacter capsulatus ?
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?

Synonyms

Synonyms Comment Organism
DMSOR
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Rhodobacter capsulatus

Turnover Number [1/s]

Turnover Number Minimum [1/s] Turnover Number Maximum [1/s] Substrate Comment Organism Structure
8
-
Dimethylsulfide pH 8.0, 25┬░C Rhodobacter capsulatus
17
-
reduced benzyl viologen pH 8.0, 25┬░C Rhodobacter capsulatus
27
-
reduced methyl viologen pH 8.0, 25┬░C Rhodobacter capsulatus

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
6.5
-
reduction of dimethyl sulfoxide Rhodobacter capsulatus
8.3
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oxidation of dimethyl sulfide Rhodobacter capsulatus