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Volume 272, Number 37, Issue of September 12, 1997 pp. 23303-23311
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.

An NADPH:FAD Oxidoreductase from the Valanimycin Producer, Streptomyces viridifaciens
CLONING, ANALYSIS, AND OVEREXPRESSION

(Received for publication, April 15, 1997, and in revised form, June 10, 1997)

Ronald J. Parry and Wenying Li

From the Department of Chemistry, Rice University, Houston, Texas 77005-1892

The valanimycin producer Streptomyces viridifaciens contains a two-component enzyme system that catalyzes the oxidation of isobutylamine to isobutylhydroxylamine. One component of this enzyme system is isobutylamine hydroxylase, and the other component is a flavin reductase. The gene (vlmR) encoding the flavin reductase required by isobutylamine hydroxylase has been cloned from S. viridifaciens by chromosome walking. The gene codes for a protein of 194 amino acids with a calculated mass of 21,265 Da and a calculated pI of 10.2. Overexpression of the vlmR gene in Escherichia coli as an N-terminal His-tag derivative yielded a soluble protein that was purified to homogeneity. Removal of the N-terminal His-tag from the overexpressed protein by thrombin cleavage also produced a soluble protein. Both forms of the protein exhibited a high degree of flavin reductase activity, and the thrombin-cleaved form functioned in combination with isobutylamine hydroxylase to catalyze the conversion of isobutylamine to isobutylhydroxylamine. Kinetic data indicate that the overexpressed protein utilizes FAD and NADPH in preference to FMN, riboflavin, and NADH. The deduced amino acid sequence of the VlmR protein exhibited similarity to several other flavin reductases that may constitute a new family of flavin reductases.


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