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J Bacteriol. 1972 March; 109(3): 1139-1143
Copyright © 1972 American Society for Microbiology. All Rights Reserved.

Uninducible Mutants in the gal i Locus of Saccharomyces cerevisiae

Department of Microbiology, University of Washington, Seattle, Washington 98105
Department of Genetics, University of Washington, Seattle, Washington 98105

ABSTRACT

Uninducible galactose nonfermenter mutants of Saccharomyces cerevisiae have been isolated and mapped in the gal i locus. They appear to be analogous to the i^s mutations found in the regulatory genes of the Escherichia coli lactose and galactose systems. The susceptibility to suppression by an ochre suppressor of an i allele in an i^si^– double mutant suggests that the i locus in S. cerevisiae codes for a protein.

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