1887

Abstract

sp. NK8 grows abundantly on 3-chlorobenzoate (3CB),4-chlorobenzoate (4CB) and benzoate. The genes encoding the oxidation of (chloro)benzoates () and catechol (, ), the LysR-type regulatory gene and the gene with unknown function, all of which form a single cluster in NK8, were cloned and analysed. The protein sequence of chlorobenzoate 1,2-dioxygenase (CbeABC) is 50–65% identical to the benzoate dioxygenase (BenABC) of sp. ADP1, toluate dioxygenase (XylXYZ) of the TOL plasmid pWW0 and 2-halobenzoate dioxygenase (CbdABC) of 2CBS. Disruption of the gene resulted in the simultaneous loss of the ability to grow on benzoate and monochlorobenzoates, indicating the involvement of the genes in the degradation of these aromatics. The genes are preceded by , the gene for catechol dioxygenase. transcriptional fusion studies in showed that and are co-expressed under the positive control of , a LysR-type transcriptional regulatory gene. The :: transcriptional fusion studies showed that the inducers of the genes are 3CB, 4CB, benzoate and probably ,muconate. On the other hand, 2-chlorobenzoate (2CB) did not activate the expression of the genes. The chlorobenzoate dioxygenase was able to transform 2CB, 3CB, 4CB and benzoate at considerable rates. 2CB yielded both catechol and 3-chlorocatechol (3CC), and 3CB gave rise to 4-chlorocatechol and 3CC as the major and minor intermediate products, respectively, indicating that the NK8 dioxygenase lacks absolute regiospecificity. The absence of growth of NK8 on 2CB, despite its considerable degradation activity against 2CB, is apparently due to the inability of CbeR to recognize 2CB as an inducer of the expression of the genes.

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2001-01-01
2019-10-20
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