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. 1991 Nov;173(22):7106–7112. doi: 10.1128/jb.173.22.7106-7112.1991

Purification and characterization of a soybean flour-inducible ferredoxin reductase of Streptomyces griseus.

M Ramachandra 1, R Seetharam 1, M H Emptage 1, F S Sariaslani 1
PMCID: PMC209216  PMID: 1938912

Abstract

We have purified an NADH-dependent ferredoxin reductase from crude extracts of Streptomyces griseus cells grown in soybean flour-enriched medium. The purified protein has a molecular weight of 60,000 as determined by sodium dodecyl sulfate gel electrophoresis. The enzyme requires Mg2+ ion for catalytic activity in reconstituted assays, and its spectral properties resemble those of many other flavin adenine dinucleotide-containing flavoproteins. A relatively large number of hydrophobic amino acid residues are found by amino acid analysis, and beginning with residue 7, a consensus flavin adenine dinucleotide binding sequence, GXGXXGXXXA, is revealed in this protein. In the presence of NADH, the ferredoxin reductase reduces various electron acceptors such as cytochrome c, potassium ferricyanide, dichlorophenolindophenol, and nitroblue tetrazolium. However, only cytochrome c reduction by the ferredoxin reductase is enhanced by the addition of ferredoxin. In the presence of NADH, S. griseus ferredoxin and cytochrome P-450soy, the ferredoxin reductase mediates O dealkylation of 7-ethoxycoumarin.

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Selected References

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