Abstract
The pathways used by three bacterial strains of the genus Bacillus to degrade 4-hydroxybenzoate are delineated. When B. brevis strain PHB-2 is grown on 4-hydroxybenzoate, enzymes of the protocatechuate branch of the beta-ketoadipate pathway are induced. In contrast, B. circulans strain 3 contains high levels of the enzymes of the protocatechuate 2,3-dioxygenase pathway after growth on 4-hydroxybenzoate. B. laterosporus strain PHB-7a degrades 4-hydroxybenzoate by a novel reaction sequence. After growth on 4-hydroxybenzoate, strain PHB-7a contains high levels of gentisate oxygenase (EC 1.13.11.4) and maleylpyruvate hydrolase. Whole cells of strain PHB-7a (grown on 4-hydroxylbenzoate) accumulate 2,5-dihydroxybenzoate (gentisate) from 4-hydroxybenzoate when incubated in the presence of 1mM alpha,alpha'-dipyridyl. Thus, strain PHB-7a appears to convert 4-hydroxybenzoate to gentisate, which is further degraded by the glutathione-independent gentisic acid pathway. These pathway delineations provide evidence that Bacillus species are derived from a diverse evolutionary background.
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