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. 1989 Apr;55(4):887–892. doi: 10.1128/aem.55.4.887-892.1989

Bacterial dehalogenation of chlorobenzoates and coculture biodegradation of 4,4'-dichlorobiphenyl.

P Adriaens 1, H P Kohler 1, D Kohler-Staub 1, D D Focht 1
PMCID: PMC184219  PMID: 2499257

Abstract

Acinetobacter sp. strain 4CB1 was isolated from a polychlorobiphenyl-contaminated soil sample by using 4-chlorobenzoate as a sole source of carbon and energy. Resting cells of Acinetobacter sp. strain 4CB1 hydrolytically dehalogenated 4-chlorobenzoate under aerobic and anaerobic conditions, but 4-hydroxybenzoate accumulated only under anaerobic conditions. Cell extracts of Acinetobacter sp. strain 4CB1 oxidized 4-hydroxybenzoate by an NADH-dependent monooxygenase to form protocatechuate, which was subsequently oxidized by both ortho- and meta-protocatechuate dioxygenase reactions. When grown on biphenyl, Acinetobacter sp. strain P6 cometabolized 4,4'-dichlorobiphenyl primarily to 4-chlorobenzoate; however, when this strain was grown in a coculture with Acinetobacter sp. strain 4CB1, 4-chlorobenzoate did not accumulate but was converted to inorganic chloride. When resting cells of Acinetobacter sp. strain 4CB1 were incubated anaerobically with 3,4-dichlorobenzoate, they accumulated 4-carboxy-1,2-benzoquinone as a final product. Since 3,4-dichlorobenzoate is a product that is formed from the cometabolism of 3,4-dichloro-substituted tetrachlorobiphenyls by Acinetobacter sp. strain P6, the coculture has a potential application for dehalogenation and mineralization of specific polychlorobiphenyl congeners.

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Selected References

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