Summary
A spontaneous high-level cycloheximide-resistant mutant of the yeast Saccharomyces cerevisiae (strain cy32) is found to have an altered protein of the large subunit (60S) of cytoplasmic ribosomes, namely protein L29. The resistance character segregates together with this biochemical defect and is semidominant in heterozygous diploids. Judged from in vitro susceptibility to inhibition by cycloheximide there are at least 50% resistant ribosomes present in such diploid strains. From these results it is concluded that cycloheximide resistance of mutant cy32 is caused by mutation of a single gene and that it is the structural gene for L29 which is affected.
Preliminary genetic mapping data are also reported. They indicate a location of cyhx-32 marker on chromosome 7 near met13.
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Some of the data delt with in this paper were reported on the IX. Steenbock Symposium on Ribosomes, July 5th to 8th, 1979, Madison (Wisc.), U.S.A.
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Stöcklein, W., Piepersberg, W. Altered ribosomal protein L29 in a cycloheximide-resistant strain of Saccharomyces cerevisiae . Curr Genet 1, 177–183 (1980). https://doi.org/10.1007/BF00390941
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DOI: https://doi.org/10.1007/BF00390941