Multiple allelic states of the cyh2 gene cause low- and high-level cycloheximide resistance in Saccharomyces cerevisiae.

At least four different mutations at the cyh2 locus (rp1X; gene product: YL24) of Saccharomyces cerevisiae confer cycloheximide resistance. The mutant YL24 proteins are either more basic (high-level resistant phenotype), more acidic (low-level resistant phenotype), or unchanged in their electrophoretic mobility (both low-and high-level resistant phenotypes). None of the mutations at other loci seem to induce high-level resistance to cycloheximide.