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• W1899541567 abstract "Temperature-sensitive mutations were generated in the Saccharomyces cerevisiae PPH22 gene that, together with its homologue PPH21, encode the catalytic subunit of type 2A protein phosphatase (PP2A). At the restrictive temperature (37°), cells dependent solely on pph22ts alleles for PP2A function displayed a rapid arrest of proliferation. Ts– pph22 mutant cells underwent lysis at 37°, showing an accompanying viability loss that was suppressed by inclusion of 1 m sorbitol in the growth medium. Ts– pph22 mutant cells also displayed defects in bud morphogenesis and polarization of the cortical actin cytoskeleton at 37°. PP2A is therefore required for maintenance of cell integrity and polarized growth. On transfer from 24° to 37°, Ts– pph22 mutant cells accumulated a 2N DNA content indicating a cell cycle block before completion of mitosis. However, during prolonged incubation at 37°, many Ts– pph22 mutant cells progressed through an aberrant nuclear division and accumulated multiple nuclei. Ts– pph22 mutant cells also accumulated aberrant microtubule structures at 37°, while under semi-permissive conditions they were sensitive to the microtubule-destabilizing agent benomyl, suggesting that PP2A is required for normal microtubule function. Remarkably, the multiple defects of Ts– pph22 mutant cells were suppressed by a viable allele (SSD1-v1) of the polymorphic SSD1 gene." @default.
• W1899541567 created "2016-06-24" @default.
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• W1899541567 date "1997-02-01" @default.
• W1899541567 modified "2023-10-10" @default.
• W1899541567 title "Mutations in the <i>Saccharomyces cerevisiae</i> Type <i>2A</i> Protein Phosphatase Catalytic Subunit Reveal Roles in Cell Wall Integrity, Actin Cytoskeleton Organization and Mitosis" @default.
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• W1899541567 doi "https://doi.org/10.1093/genetics/145.2.227" @default.
• W1899541567 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1207790" @default.
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