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. 1994 Oct;60(10):3833–3839. doi: 10.1128/aem.60.10.3833-3839.1994

Construction of a Novel Polychlorinated Biphenyl-Degrading Bacterium: Utilization of 3,4′-Dichlorobiphenyl by Pseudomonas acidovorans M3GY

M V McCullar 1, Vladimir Brenner 2, Randy H Adams 2,†, D D Focht 1,2,*
PMCID: PMC201892  PMID: 16349419

Abstract

Pseudomonas acidovorans M3GY is a recombinant bacterium with the novel capacity to utilize a biphenyl congener chlorinated on both rings, 3,4′-dichlorobiphenyl (3,4′-DCBP), as a sole carbon and energy source. Strain M3GY was constructed with a continuous amalgamated culture apparatus (L. Kröckel and D. D. Focht, Appl. Environ. Microbiol. 53:2470-2475, 1987) with P. acidovorans CC1(19), a chloroacetate and biphenyl degrader, and Pseudomonas sp. strain CB15(1), a biphenyl and 3-chlorobenzoate degrader. Genetic and phenotypic data showed the recipient parental strain to be P. acidovorans CC1 and the donor parental strain to be Pseudomonas sp. strain CB15. In growth experiments with 3,4′-DCBP as a sole source of carbon, cultures of strain M3GY increased in absorbance from 0.07 to 0.39 in 29 days while reaching a protein concentration of 58 μg ml-1 and 67% substrate dehalogenation. 4-Chlorobenzoate was identified from culture supernatants of strain M3GY by gas chromatography-infrared spectrometry-mass spectrometry; this would be consistent with the oxidation of the m-chlorinated ring through the standard biphenyl pathway. 4-Chlorobenzoate was converted to 4-chlorocatechol, which was metabolized through the meta-fission pathway. The construction of P. acidovorans M3GY, with the novel capability to utilize 3,4′-DCBP, thus involves the complete use of meta-fission pathways for sequential rupture of the biphenyl and chlorobenzoate rings.

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Selected References

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