o-, m- and p-hydroxybenzoate degradative pathways in Rhodococcus erythropolis.

Rhodococcus erythropolis strain S1 uses the gentisate pathway to metabolize salicylate and m-hydroxybenzoate and the protocatechuate pathway to degrade p-hydroxybenzoate. m-Hydroxybenzoate 6-hydroxylase was induced by growth on m-hydroxybenzoate or gentisate, and salicylate 5-hydroxylase only by growth on salicylate. p-Hydroxybenzoate 3-hydroxylase could be induced only by growth on p-hydroxybenzoate. m-Hydroxybenzoate or p-hydroxybenzoate could repress the induction of salicylate 5-hydroxylase. Maleylpyruvate isomerase in the gentisate pathway did not require reduced glutathione.