Previous Article | Next Article ![]()
Appl. Environ. Microbiol., Nov 1996, 4276-4279, Vol 62, No. 11
DL Daubaras, K Saido and AM Chakrabarty
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.
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
Department of Microbiology and Immunology, College of Medicine, University of Illinois at Chicago 60612, USA.
This article has been cited by other articles:
Copyright © 2009 by the American Society for Microbiology. For an alternate route to Journals.ASM.org, visit: http://intl-journals.asm.org | More Info»