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. 1984 Nov;160(2):618-21.
doi: 10.1128/jb.160.2.618-621.1984.

Oxidation and dehalogenation of 4-chlorophenylacetate by a two-component enzyme system from Pseudomonas sp. strain CBS3

A Markus, U Klages, S Krauss, F Lingens

Oxidation and dehalogenation of 4-chlorophenylacetate by a two-component enzyme system from Pseudomonas sp. strain CBS3

A Markus et al. J Bacteriol. 1984 Nov.

Abstract

In cell-free extracts from Pseudomonas sp. strain CBS3 the conversion of 4-chlorophenylacetate to 3,4-dihydroxyphenylacetate was demonstrated. By Sephacryl S-200 chromatography two protein fractions, A and B, were obtained which both were essential for enzyme activity. Fe2+ and NADH were cofactors of the reaction. NADPH also activated the enzyme, but less effectively than NADH. FAD had no influence on enzyme activity. 4-Hydroxyphenylacetate, 4-chloro-3-hydroxyphenylacetate, and 3-chloro-4-hydroxyphenylacetate were poor substrates for the enzyme, suggesting that these substances are not intermediates of the reaction. We therefore suggest that the reaction proceeds via a dioxygenated intermediate.

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