Abstract
The hybrid pathway for chlorobenzoate metabolism was studied in WR211 and WR216, which were derived from Pseudomonas sp. B13 by acquisition of TOL plasmid pWW0 from Pseudomonas putida mt-2. Chlorobenzoates are utilized readily by these strains when meta cleavage of chlorocatechols is suppressed. When WR211 utilizes 3-chlorobenzoate (3CB), the expression of catechol 2,3-dioxygenase (C23O) and the catabolic activities for chloroaromatics via the ortho pathway coexist as a consequence of inactivation of the meta cleavage activity by 3-chlorocatechol. Utilization of 4-chlorobenzoate (4CB) by WR216 presupposes the suppression of C23O by a spontaneous mutation in the structural gene, so that 4-chlorocatechol is not misrouted into the meta pathway. Such C23O- mutants were also selected when WR211 was grown continuously on 3CB. Our data explain why the phenotypic characters 3CB+ and Mtol+ (m-toluate) are compatible, whereas 4CB+ and Mtol+ are incompatible.
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