Isolation and Characterization of Mutants Which Show an Oversecretion Phenotype in Saccharomyces Cerevisiae

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We have isolated mutants responsible for an oversecretion phenotype in Saccharomyces cerevisiae, using a promoter of SUC2 and the gene coding for α-amylase from mouse as a marker of secretion. These mutations defined two complementation groups, designated as ose1 (over secretion) and rgr1 (resistant to glucose repression). The ose1 mutant produced an oversecretion of amylase by 12- to 15-fold under derepressing conditions; however, the amylase mRNA was present at nearly the same amount as it was in the parent cells. No expression of the amylase gene was detected under repressing conditions. The rgr1 mutant oversecreted amylase by 11- to 13-fold under repressing conditions and by 15- to 18-fold under derepressing conditions. The rgr1 mutant showed pleiotropic effects on the following cellular functions: (1) resistance to glucose repression, (2) temperature-sensitive lethality, (3) sporulation deficiency in homozygous diploid cells, and (4) abnormal cell morphology. The rgr1 mutation was not allelic with ssn6 and cyc9, and failed to suppress snf1.

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