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Gene. 1993 Aug 16;130(1):47-55.

Genetic analysis of a Pseudomonas locus encoding a pathway for biphenyl/polychlorinated biphenyl degradation.

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  • 1Department of Microbiology, Gesellschaft für Biotechnologische Forschung, Braunschweig, Germany.


The cistronic organization of the bph locus, encoding a biphenyl/polychlorinated biphenyl (PCB) degradation pathway in Pseudomonas sp. LB400, has been elucidated. Seven structural genes, encoding biphenyl dioxygenase (bphA1A2A3A4), biphenyl-2,3-dihydrodiol-2,3-dehydrogenase (bphB), biphenyl-2,3-diol-1,2-dioxygenase (bphC) and 2-hydroxy-6-oxo-6-phenylhexa-2,4-dienoate hydrolase (bphD), have been located. The complete sequences of bphB, bphC and bphD are reported. Taken together with the data of Erickson and Mondello [J. Bacteriol. 174 (1992) 2903-2912], Pseudomonas sp. LB400 is now the first strain for which the sequences of all genes encoding the catabolism from biphenyls to benzoates have been determined. Comparisons of the deduced amino acid (aa) sequences of BphB, BphC and BphD with those of related proteins led to predictions about catalytically important aa residues. Six Bph have been detected and identified. Five of them could be obtained as the most abundant proteins when their genes were expressed in Escherichia coli.

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