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. 1985 Dec;5(12):3357–3360. doi: 10.1128/mcb.5.12.3357

Diphtheria toxin-resistant mutants of Saccharomyces cerevisiae.

J Y Chen, J W Bodley, D M Livingston
PMCID: PMC369163  PMID: 3915773

Abstract

We developed a selection procedure based on the observation that diphtheria toxin kills spheroplasts of Saccharomyces cerevisiae (Murakami et al., Mol. Cell. Biol. 2:588-592, 1982); this procedure yielded mutants resistant to the in vitro action of the toxin. Spheroplasts of mutagenized S. cerevisiae were transformed in the presence of diphtheria toxin, and the transformed survivors were screened in vitro for toxin-resistant elongation factor 2. Thirty-one haploid ADP ribosylation-negative mutants comprising five complementation groups were obtained by this procedure. The mutants grew normally and were stable to prolonged storage. Heterozygous diploids produced by mating wild-type sensitive cells with the mutants revealed that in each case the resistant phenotype was recessive to the sensitive phenotype. Sporulation of these diploids yielded tetrads in which the resistant phenotype segregated as a single Mendelian character. From these observations, we concluded that these mutants are defective in the enzymatic steps responsible for the posttranslational modification of elongation factor 2 which is necessary for recognition by diphtheria toxin.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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