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Compartmentation of intracellular amino acid pools has been studied under various growth conditions in wild-type strains as well as in mutants. Aspartate, glutamate, leucine and isoleucine pools are present in high concentrations in the cytoplasm, while all the other amino acids are more vacuolar. The nature of the nitrogen source for growth, the effectiveness of nitrogen assimilation, the rate of protein synthesis and the presence of high internal basic amino acid pools are important factors in the repartition of amino acid pools between the cytoplasm and the vacuole.
Messenguy et al. (Tue,) studied this question.