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Derivatives of Pseudomonas sp. B13 which had acquired the capability to utilize 4-chloro- and 3,5-dichlorobenzoate as a consequence of the introduction of genes of the TOL plasmid of Pseudomonas putida mt-2 were studied. The utilization of these substrates, a property not shared by the parent strains, was shown to depend upon the combined activities of enzymes from the donor and from the recipient. During growth on 3-chloro-, 4-chloro-, and 3,5-dichlorobenzoate, predominantly the toluate 1,2-deoxygenase and both dihydrodihydroxybenzoate dehydrogenases of the parent strains were induced. On the other hand, no catechol 2,3-dioxygenase from P. putida mt-2 was detectable, so that degradation of chlorocatechols by the nonproductive meta-cleavage pathway was avoided. Instead of that, chlorocatechols were subject to ortho cleavage and totally degraded by the preexisting enzymes of Pseudomonas sp. B13.

Hybrid pathway for chlorobenzoate metabolism in Pseudomonas sp. B13 derivatives