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- W2167826437 abstract "Abstract Microtubules in yeast are functional components of the mitotic and meiotic spindles and are essential for nuclear movement during cell division and mating. We have isolated 70 conditional-lethal mutations in the TUB1 alpha-tubulin gene of the yeast Saccharomyces cerevisiae using a plasmid replacement technique. Of the 70 mutations isolated, 67 resulted in cold-sensitivity, one resulted in temperature-sensitivity, and two resulted in both. Fine-structure mapping revealed that the mutations were located throughout the TUB1 gene. We characterized the phenotypes caused by 38 of the mutations after shifts of mutants to the nonpermissive temperature. Populations of temperature-shifted mutant cells contained an excess of large-budded cells with undivided nuclei, consistent with the previously determined role of microtubules in yeast mitosis. Several of the mutants arrested growth with a sufficiently uniform morphology to indicate that TUB1 has at least one specific role in the progression of the yeast cell cycle. A number of the mutants had gross defects in microtubule assembly at the restrictive temperature, some with no microtubules and some with excess microtubules. Other mutants contained disorganized microtubules and nuclei. There were no obvious correlations between these phenotypes and the map positions of the mutations. Greater than 90% of the mutants examined were hypersensitive to the antimicrotubule drug benomyl. Mutations that suppressed the cold-sensitive phenotypes of two of the TUB1 alleles occurred in TUB2, the single structural gene specifying beta-tubulin." @default.
- W2167826437 created "2016-06-24" @default.
- W2167826437 creator A5049485062 @default.
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- W2167826437 date "1988-11-01" @default.
- W2167826437 modified "2023-10-16" @default.
- W2167826437 title "Isolation and characterization of conditional-lethal mutations in the TUB1 alpha-tubulin gene of the yeast Saccharomyces cerevisiae." @default.
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- W2167826437 doi "https://doi.org/10.1093/genetics/120.3.681" @default.
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