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. 1991 May;11(5):2647–2655. doi: 10.1128/mcb.11.5.2647

A mutation in the yeast heat-shock factor gene causes temperature-sensitive defects in both mitochondrial protein import and the cell cycle.

B J Smith 1, M P Yaffe 1
PMCID: PMC360034  PMID: 2017170

Abstract

Yeast cells containing the recessive mas3 mutation display temperature-sensitive defects in both mitochondrial protein import and the cell division cycle. The import defect is characterized by two pools of mitochondrial precursors and a dramatically slower rate of posttranslational import. The effect of mas3 on cell cycle progression occurs within one cell cycle at the nonpermissive temperature and retards progression through the G2 stage. The mas3 mutation maps to the gene encoding yeast heat-shock transcription factor (HSF), and expression of wild-type HSF complements the temperature-sensitive defects. The mas3 lesion has no apparent effect on protein secretion. In mas3 cells, induction of a major heat-shock gene, SSA1, is defective at 37 degrees C. The properties of the mas3 mutant cells indicate that HSF mediates the response to stress of two basic cellular processes: mitochondrial protein import and cell cycle progression.

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