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Physiological Advantage of the Mechanism of the Tryptophan Synthetase Reaction

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PMC
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  • Physiology And Metabolism

Abstract

Indole-accumulating and indole-utilizing tryptophan synthetase mutants of Saccharomyces cerevisiae were found to form complementing diploids with unusual growth properties. These strains grew at nearly the wild-type exponential rate, but only after an abnormally prolonged lag period of a duration that depended on the initial cell density. The exaggerated lag was reduced by adding low concentrations of indole in the medium. The growth properties were interpreted to be a consequence of the inability of these strains to synthesize tryptophan by the normal mechanism.

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