Abstract
Pseudomonas putida NCIB 10015 metabolizes phenol and the cresols (methylphenols) by the meta pathway and metabolizes benzoate by the ortho pathway. Growth on catechol, an intermediate in the metabolism of both phenol and benzoate, induces both ortho and meta pathways; growth on 3- or 4-methylcatechols, intermediates in the metabolism of the cresols, induces only the meta pathway to a very limited degree. Addition of catechol at a growth-limiting rate induces virtually no meta pathway enzymes, but high levels of ortho pathway enzymes. The role of catechol and the methylcatechols as inducers is discussed. A method is described for assaying low levels of catechol 1,2-oxygenase in the presence of high levels of catechol 2,3-oxygenase and vice versa.
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