1887

Abstract

sp. JF8 is a thermophilic polychlorinated biphenyl (PCB) degrader, which utilizes biphenyl and naphthalene. A thermostable, Mn-dependent 2,3-dihydroxybiphenyl 1,2-dioxygenase, BphC_JF8, has been characterized previously. Upstream of are five ORFs exhibiting low homology with, and a different gene order from, previously characterized genes. From the 5′ to 3′ direction the genes are: a putative regulatory gene (), a hydrolase (), the large and small subunits of a ring-hydroxylating dioxygenase ), and a -diol dehydrogenase (). Hybridization studies indicate that the genes are located on a plasmid. Ring-hydroxylating activity of recombinant BphA1A2_JF8 towards biphenyl, PCB, naphthalene and benzene was observed in cells, with complementation of non-specific ferredoxin and ferredoxin reductase by host cell proteins. PCB degradation by recombinant BphA1A2_JF8 showed that the congener specificity of the recombinant enzyme was similar to sp. JF8. BphD_JF8, with an optimum temperature of 85 °C, exhibited a narrow substrate preference for 2-hydroxy-6-oxo-6-phenylhexa-2,4-dienoic acid. The Arrhenius plot of BphD_JF8 was biphasic, with two characteristic energies of activation and a break point at 47 °C.

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2005-12-01
2021-10-23
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