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Quinoline oxidoreductase from Rhodococcus spec. B1 was purified 39-fold to apparent homogeneity in a 5-step procedure with a recovery of 26%. The Mr of the native enzyme as determined by gel chromatography was 300,000. SDS polyacrylamide gel electrophoresis of the enzyme revealed 3 protein bands corresponding to Mr 82,000, 32,000, and 18,000. The enzyme contains 1.3 atoms of molybdenum, 8 atoms of iron, 8 atoms of acid-labile sulphur, 2 molecules of FAD and 2 molecules of molybdopterin cytosine dinucleotide. Cyanide, 4-hydroxymercuribenzoate and methanol were effective as inhibitors. The amino-terminal protein sequences of the 3 subunits of quinoline oxidoreductase from Rhodococcus B1 compared to those of quinoline oxidoreductase from Pseudomonas putida 86 revealed no difference among 71 amino acids examined.

biological chemistry hoppe-seyler

Microbial Metabolism of Quinoline and Related Compounds. XII. Isolation and Characterization of the Quinoline Oxidoreductase from  Rhodococcus spec.  B1 Compared with the Quinoline Oxidoreductase from  Pseudomonas putida  86