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J. Bacteriol., 05 1996, 2645-2649, Vol 178, No. 9
Copyright © 1996, American Society for Microbiology

Purification and characterization of chlorophenol 4-monooxygenase from Burkholderia cepacia AC1100

L Xun
Department of Microbiology, Washington State University Tri-Cities, Richland 99352, USA.

Burkholderia (formerly Pseudomonas) cepacia AC1100 mineralizes the herbicide 2,4,5-trichlorophenoxyacetate (2,4,5-T), and the first intermediate of 2,4,5-T degradation is 2,4,5-trichlorophenol. Chlorophenol 4-monooxygenase activity responsible for 2,4,5- trichlorophenol degradation was detected in the cell extract. The enzyme consisted of two components separated during purification, and both were purified to more than 95% homogeneity. The reconstituted enzyme catalyzed the hydroxylation of several tested chlorophenols with the coconsumption of NADH and oxygen. In addition to chlorophenols, the enzyme also hydroxylated some chloro-p-hydroquinones with the coconsumption of NADH and oxygen. Apparently, the single enzyme was responsible for converting 2,4,5-trichlorophenol to 2,5-dichloro-p- hydroquinone and then to 5-chlorohydroxyquinol (5-chloro-1,2,4- trihydroxybenzene). Component A had a molecular weight of 22,000 and contained flavin adenine dinucleotide. Component A alone catalyzed NADH- dependent cytochrome c reduction, indicating that it had reductase activity. Component B had a molecular weight of 58,000, and no catalytic activity has yet been shown by itself.


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