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  • Title: A meta cleavage pathway for 4-chlorobenzoate, an intermediate in the metabolism of 4-chlorobiphenyl by Pseudomonas cepacia P166.
    Author: Arensdorf JJ, Focht DD.
    Journal: Appl Environ Microbiol; 1995 Feb; 61(2):443-7. PubMed ID: 7574580.
    Abstract:
    Bacterial degradation of biphenyl and polychlorinated biphenyls proceeds by a well-studied pathway which produces benzoate and 2-hydroxypent-2,4-dienoate (or, in the case of polychlorinated biphenyls, the chlorinated derivatives of these compounds). Pseudomonas cepacia P166 utilizes 4-chlorobiphenyl for growth and produces 4-chlorobenzoate as a central intermediate. In this study we found that strain P166 further transforms 4-chlorobenzoate to 4-chlorocatechol, which is mineralized by a meta cleavage pathway. Key metabolites which we identified include the meta cleavage product (5-chloro-2-hydroxymuconic semialdehyde), 5-chloro-2-hydroxymuconate, 5-chloro-2-oxopent-4-enoate, 5-chloro-4-hydroxy-2-oxopentanoate, and chloroacetate. Chloroacetate accumulated transiently, and slow but stoichiometric dehalogenation was observed.
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