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Ureidosuccinic Acid Uptake in Yeast and Some Aspects of Its Regulation

Laboratoire de Génétique Physiologique, Université Louis Pasteur, 67 Strasbourg, France

ABSTRACT

Ureidosuccinic acid (USA) is an intermediary product in pyrimidine biosynthesis. When proline was the sole nitrogen source, USA uptake occurred; however, when ammonium sulfate or glutamic acid was the nitrogen source, uptake was inhibited. Thus, a ura2 strain which does not synthesize USA would not grow when this substance was supplied on an ammonium sulfate or glutamic acid medium. Mutants are described in which uptake was constitutive on such a medium. Permeaseless mutants for USA have been found, and evidence is presented for permease specificity. It is shown that all constitutive mutants use the same transport system that is missing in the permeaseless mutant. These mutants are constitutive for two permeases: the specific USA permease and the general amino acid permease. The transport system studied here, like the general amino acid transport system, is regulated by nitrogen metabolism. These facts and others suggest that our permease constitutive mutants are impaired in nitrogen metabolism.

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