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Saccharomyces cerevisiae responds to nitrogen availability in several ways. (i) The cell is able to distinguish good nitrogen sources from poor ones through a process designated nitrogen catabolite repression (NCR). Good and poor nitrogen sources do not demonstrably affect the cell cycle other than to influence the cell’s doubling time. (ii) Nitrogen starvation promotes the initiation of sporulation and pseudohyphal growth. (iii) Nitrogen starvation strongly affects the cell cycle; nitrogen-starved cells arrest in G1 . A specific allele of theSUP70/CDC65 tRNAGln gene (sup70-65 ) has been reported to be defective in nitrogen signaling associated with pseudohyphal formation, sporulation, and NCR. Our data confirm that pseudohyphal growth occurs gratuitously insup70-65 mutants cultured in nitrogen-rich medium at 30°C. However, we find neither any defect in NCR in thesup70-65 mutant nor any alteration in the control ofYVH1 expression, which has been previously shown to be specifically induced by nitrogen starvation.

journal of bacteriology

Control of Nitrogen Catabolite Repression Is Not Affected by the tRNA <sup>Gln-CUU</sup> Mutation, Which Results in Constitutive Pseudohyphal Growth of <i>Saccharomyces cerevisiae</i>

Control of Nitrogen Catabolite Repression Is Not Affected by the tRNA Gln-CUU Mutation, Which Results in Constitutive Pseudohyphal Growth of Saccharomyces cerevisiae

Control of Nitrogen Catabolite Repression Is Not Affected by the tRNA ^Gln-CUU Mutation, Which Results in Constitutive Pseudohyphal Growth of Saccharomyces cerevisiae