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PubMed1972

Genetic control of enzyme induction in the -ketoadipate pathway of Pseudomonas putida: deletion mapping of cat mutations.

A number of spontaneous mutant strains of Pseudomonas putida, obtained by repeated selection for inability to grow with cis,cis-muconate, have been shown to carry deletions in catB, the structural gene for muconate lactonizing enzyme. These strains have been employed for deletion mapping of the genetic region containing catB and catC (the structural gene for muconolactone isomerase, the synthesis of which is coordinate with that of muconate lactonizing enzyme). All deletions that overlap mutant sites located on the left side of the genetic map, as well as the point mutations in that region, lead to a pleiotropic loss of both catB and catC activities. We propose that this region to the left of catB has a regulatory function. Although the details of regulation at the molecular level are unclear, our data indicate that catB and catC may well be controlled by a mechanism unlike any yet described by workers on enteric bacteria.

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