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Appl. Environ. Microbiol., Nov 1996, 4276-4279, Vol 62, No. 11
Copyright © 1996, American Society for Microbiology

Purification of hydroxyquinol 1,2-dioxygenase and maleylacetate reductase: the lower pathway of 2,4,5-trichlorophenoxyacetic acid metabolism by Burkholderia cepacia AC1100

DL Daubaras, K Saido and AM Chakrabarty
Department of Microbiology and Immunology, College of Medicine, University of Illinois at Chicago 60612, USA.

The enzyme hydroxyquinol 1,2-dioxygenase, which catalyzes ortho cleavage of hydroxyquinol (1,2,4-trihydroxybenzene) to produce maleylacetate, was purified from Escherichia coli cells containing the tftH gene from Burkholderia cepacia AC1100. Reduction of the double bond in maleylacetate is catalyzed by the enzyme maleylacetate reductase, which was also purified from E. coli cells, these cells containing the tftE gene from B. cepacia AC1100. The two enzymes together catalyzed the conversion of hydroxyquinol to 3-oxoadipate. The purified hydroxyquinol 1,2-dioxygenase was specific for hydroxyquinol and was not able to use catechol, tetrahydroxybenzene, 6- chlorohydroxyquinol, or 5-chlorohydroxyquinol as its substrate. The native molecular mass of hydroxyquinol 1,2-dioxygenase was 68 kDa, and the subunit size of the protein was 36 kDa, suggesting a dimeric protein of identical subunits.


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