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. 1997 Jun;179(11):3482–3487. doi: 10.1128/jb.179.11.3482-3487.1997

Purification, characterization, and properties of an aryl aldehyde oxidoreductase from Nocardia sp. strain NRRL 5646.

T Li 1, J P Rosazza 1
PMCID: PMC179138  PMID: 9171390

Abstract

An aryl aldehyde oxidoreductase from Nocardia sp. strain NRRL 5646 was purified 196-fold by a combination of Mono-Q, Reactive Green 19 agarose affinity, and hydroxyapatite chromatographies. The purified enzyme runs as a single band of 140 kDa on sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The molecular mass was estimated to be 163 +/- 3.8 kDa by gel filtration, indicating that this enzyme is a monomeric protein. The binding of the enzyme to Reactive Green 19 agarose was Mg2+ dependent. The binding capacity was estimated to be about 0.2 mg of Reactive Green agarose per ml in the presence of 10 mM MgCl2. This enzyme can catalyze the reduction of a wide range of aryl carboxylic acids, including substituted benzoic acids, phenyl-substituted aliphatic acids, heterocyclic carboxylic acids, and polyaromatic ring carboxylic acids, to produce the corresponding aldehydes. The Km values for benzoate, ATP, and NADPH were determined to be 645 +/- 75, 29.3 +/- 3.1, and 57.3 +/- 12.5 microM, respectively. The Vmax was determined to be 0.902 +/- 0.04 micromol/min/mg of protein. Km values for (S)-(+)-alpha-methyl-4-(2-methylpropyl)-benzeneacetic acid (ibuprofen) and its (R)-(-) isomer were determined to be 155 +/- 18 and 34.5 +/- 2.5 microM, respectively. The Vmax for the (S)-(+) and (R)-(-) isomers were 1.33 and 0.15 micromol/min/mg of protein, respectively. Anthranilic acid is a competitive inhibitor with benzoic acid as a substrate, with a Ki of 261 +/- 30 microM. The N-terminal and internal amino acid sequences of a 76-kDa peptide from limited alpha-chymotrypsin digestion were determined.

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Selected References

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