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A single strain of Pseudomonas cepacia cells was differentially induced to synthesize salicylate hydroxylase, 3-hydroxybenzoate 6-hydroxylase, or 4-hydroxybenzoate 3-hydroxylase. A procedure was developed for the purification of 3-hydroxybenzoate 6-hydroxylase to apparent homogeneity. The purified hydroxylase appears to be a monomer with a molecular weight of about 44,000 and exhibits optimal activity near pH 8. The hydroxylase contains one FAD per enzyme molecule and utilizes NADH and NADPH with similar efficiencies. The reaction stoichiometry for this enzyme has been determined. In comparison with other aromatic flavohydroxylases, this enzyme is unique in inserting a new hydroxyl group to the substrate at a position para to an existing one.
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Wang et al. (1987) studied this question.
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