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Nucleic Acids Research, 1992, Vol. 20, No. 23 6227-6233
© 1992

MOLECULAR BIOLOGY

Molecular analysis of POP2gene, a gene required for glucose-derepression of gene expression in Saccharomyces cerevisiae

Akira Sakai, Taku Chibazakura*, Yuki Shimizu and Fumio Hishinuma

Laboratory of Molecular Genetics, Mitsubishi Kasei Institute of Life Sciences 11 Minamiooya, Machida-shi, Tokyo 194, Japan

Received September 24, 1992. Revised November 5, 1992. Accepted November 5, 1992.

We have isolated a new mutant of Saccharomyces cerevisiae that exhibits a glucose-derepression resistant (and sucrose-non-fermentor) phenotype. This mutant was obtained by screening for overproduction of {alpha}-amylase in a strain containing the mouse {alpha}-amylase gene under the control of the PGK promoter. The mutation designated pop2 (PGK promoter directed over production). The pop2 mutant overproduced amylase 5–6 fold and displayed several other pieiotropic defects: (1) resistance to glucose derepression, (2) temperature-sensitive growth, (3) failure of homozygous diploid cells to sporulate and (4) reduced amount of reserve carbohydrates. We mapped pop2 to chromosome XIV, distal to Iys9 and SUP28, indicating that POP2 is a newly-identified locus. We isolated the POP2 gene from two yeast strains of different genetic backgrounds, S288C and A364A, and determined their nucleotide sequences. The predicted amino acid sequence of the POP2 protein contains three glut-amine-rich region, a proline-rich region and a serine/threonine-rich region, characteristic of many transcription factors. Steady state levels of RNA transcribed from the PGK-amylase fusion gene and from endogenous PGK gene in stationary-phase pop2 cells were 5- to 10-fold higher than those observed in wild-type cells, showing that the pop2 mutation affects transcription of the PGK gene transcription.

* Present address: Department of Genetics, Medical Research Institute, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113, Japan


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