title: Oxidation and dehalogenation of 4-chlorophenylacetate by a two-component enzyme system from Pseudomonas sp. strain CBS3.
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.
mesh_terms: D002413:Cations, Divalent; D049308:Dioxygenases; D007700:Kinetics; D009243:NAD / Q000378:metabolism; D009249:NADP / Q000378:metabolism; D010084:Oxidation-Reduction; D010105:Oxygenases / Q000302:isolation & purification / Q000378:metabolism*; D010648:Phenylacetates / Q000378:metabolism*; D011549:Pseudomonas / Q000378:metabolism*
chemical_list: D002413:Cations, Divalent; D010648:Phenylacetates; D009243:NAD; C029716:4-chlorophenylacetic acid; D009249:NADP; D010105:Oxygenases; C043629:4-chlorophenylacetate 3,4-dioxygenase; D049308:Dioxygenases