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Four thermotolerant actinomycetes from soil, identified as Streptomyces albulus 321, Streptomyces sioyaensis P5, Streptomyces viridosporus T7A, and Streptomyces sp. V7, were grown at 45 degrees C in media containing either benzoic acid or hydroxyl- and methoxyl-substituted benzoic acids as the principal carbon sources. Benzoic acid was converted to catechol; p-hydroxybenzoic, vanillic, and veratric acids were converted to protocatechuic acid; and m-hydroxybenzoic acid was converted to gentisic acid. Catechol, protocatechuic acid, and gentisic acid were cleaved by catechol 1,2-dioxygenase, protocatechuate 3,4-dioxygenase, and gentisate 1,2-dioxygenase, respectively. Dioxygenases appeared only in induced cultures. m-Hydroxybenzoic, m-anisic, and p-anisic acids were gratuitous inducers of dioxygenases in some strains. One strain converted vanillic acid to guaiacol.

Catabolism of Substituted Benzoic Acids by Streptomyces Species