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Pubmed ID :9296388
Publication Date : //

A yeast heat shock transcription factor (Hsf1) mutant is defective in both Hsc82/Hsp82 synthesis and spindle pole body duplication.


Cdc28 is a cyclin-dependent protein kinase of Saccharomyces cerevisiae that is required for the G1/S and G2/M transitions of the cell division cycle. All previously described cdc28 mutants aside from cdc28-1N arrest division specifically in the G1 phase. cdc28-1N arrests division in G2/mitosis. We show here that the cdc28-109 mutant exhibits a mixed cell division arrest at 37 degrees C with cells in both the G1 and G2 phases. In order to identify proteins that functionally interact with Cdc28, we isolated mutants that are colethal with cdc28-109 at its permissive temperature. We describe here our phenotypic analysis of two such mutants, hsf1-82 and ydj1-10, that affect the heat shock transcription factor and a yeast dnaj-like protein chaperone, respectively. hsf1-82 and ydj1-10 temperature-sensitive mutants arrest the cell division cycle at several stages. However, one predominant class of cells in both mutants was arrested with a large bud and a single vertex of microtubules. Electron microscopic analysis of such hsf1-82 cells showed that they contained an unduplicated spindle pole body with an enlarged half-bridge. Two-dimensional gel electrophoresis of total cell proteins revealed that the hsf1-82 cells were specifically defective in the expression of the Hsc82 and Hsp82 proteins. Furthermore, the hsf1-82 mutation was suppressed by the HSC82 gene on a multicopy plasmid that restored Hsc82 protein to high levels in these cells. These results show that Hsf1 is required for spindle pole body duplication at 37 degrees C.

Authors : Zarzov P , Boucherie H , Mann C ,

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