Flavin Interaction in NADPH-Sulfite Reductase
| Autor: | Lewis M. Siegel, Henry Kamin, Edward J. Faeder |
|---|---|
| Rok vydání: | 1972 |
| Předmět: |
Salmonella typhimurium
animal structures Semiquinone Flavin Mononucleotide Stereochemistry Flavin mononucleotide Flavoprotein Cytochrome c Group Flavin group Reductase Electron Transport chemistry.chemical_compound Sulfite Escherichia coli Sulfites Ferricyanides Flavin adenine dinucleotide Photolysis Flavoproteins biology Cytochrome c General Chemistry chemistry Ammonium Sulfate Flavin-Adenine Dinucleotide biology.protein Oxidoreductases Oxidation-Reduction NADP Protein Binding |
| Zdroj: | Zeitschrift für Naturforschung B. 27:1087-1089 |
| ISSN: | 1865-7117 0932-0776 |
| DOI: | 10.1515/znb-1972-0929 |
| Popis: | E. coli NADPH-sulfite reductase, depleted of FMN but retaining its FAD, has been prepared by photoirradiation of native enzyme in 30% — saturated ammonium sulfate. FMN-depleted enzyme loses its ability to reduce (using NADPH) ferricyanide, cytochrome c, sulfite, or the enzyme’s own heme-like chromophore. However, the FAD remains rapidly reducible by NADPH, and the FMN-depleted enzyme retains NADPH-acetylpyridine NADP* transhydrogenase activity. Thus, FAD can serve as entry port for NADPH electrons, and FMN is required for further transmission along the enzyme’s electron transport chain. These data, plus other studies, have enabled us to suggest a mechanism for catalysis which involves FAD cycling between the fully-oxidized and fully-reduced forms while FMN cycles between fully-reduced and semiquinone. This mechanism, which includes a disproportionation step, permits a “step-down” from the twoelectron donor, NADPH, to a succession of equipotential one-electron transfer steps. |
| Databáze: | OpenAIRE |
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