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Journal of Bacteriology, April 1999, p. 2472-2476, Vol. 181, No. 8
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

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

Alexander E. Beeser and Terrance G. Cooper*

Department of Microbiology and Immunology, University of Tennessee, Memphis, Tennessee 38163

Received 8 December 1998/Accepted 9 February 1999

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 the SUP70/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 in sup70-65 mutants cultured in nitrogen-rich medium at 30°C. However, we find neither any defect in NCR in the sup70-65 mutant nor any alteration in the control of YVH1 expression, which has been previously shown to be specifically induced by nitrogen starvation.

* Corresponding author. Phone: (901) 448-6175. Fax: (901) 448-8462. E-mail: tcooper{at}utmem1.utmem.edu.

Journal of Bacteriology, April 1999, p. 2472-2476, Vol. 181, No. 8
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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