Abstract
The metabolic fate of acetate, produced during taurine catabolism in Pseudomonas aeruginosa TAU-5, appear to involve the glyoxylate cycle. Organisms grown on taurine have significantly higher levels of malate synthetase and isocitrate lyase than cells grown on nutrient broth, but were comparable to the levels found in acetate-grown organisms. Itaconate, an isocitrate lyase inhibitor, produced a prolonged lag phase and reduced the growth rate of organisms when it was present in the taurine or acetate growth medium. Ethylmethanesulfonate treatment of TAU-5 yielded mutant strains unable to grow on taurine or acetate as sole carbon sources, due to a lack of either malate synthetase or isocitrate lyase. Spontaneous revertants derived from these mutant strains regained the missing enzyme activity and the ability to grow on taurine or acetate.
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