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o -Cresol and 3-methylcatechol were identified as successive transitory intermediates of toluene catabolism by the trichloroethylene-degrading bacterium G4. The absence of a toluene dihydrodiol intermediate or toluene dioxygenase and toluene dihydrodiol dehydrogenase activities suggested that G4 catabolizes toluene by a unique pathway. Formation of a hybrid species of18 O- and16 O-labeled 3-methylcatechol from toluene in an atmosphere of18 O2 and16 O2 established that G4 catabolizes toluene by successive monooxygenations at theortho andmeta positions. Detection of trace amounts of 4-methylcatechol from toluene catabolism suggested that the initial hydroxylation of toluene was not exclusively at theortho position. Further catabolism of 3-methylcatechol was found to proceed via catechol-2,3-dioxygenase and hydroxymuconic semialdehyde hydrolase activities.

Novel Pathway of Toluene Catabolism in the Trichloroethylene-Degrading Bacterium G4