Efficient initiation of S-phase in yeast requires Cdc40p, a protein involved in pre-mRNA splicing |
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Authors: | E Boger-Nadjar N Vaisman S Ben-Yehuda Y Kassir and M Kupiec |
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Institution: | (1) Dept. of Biology, Technion, Haifa 32000, Israel e-mail: ykassir@tx.technion.ac.il; Fax: +972-4-8225153 , IL;(2) Dept. of Molecular Microbiology and Biotechnology Tel-Aviv University, Ramat-Aviv 69978, Israel, IL |
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Abstract: | The S. cerevisiae CDC40 gene was originally identified as a cell-division-specific gene that is essential only at elevated temperatures. Cells carrying
mutations in this gene arrest with a large bud and a single nucleus with duplicated DNA content. Cdc40p is also required for
spindle establishment or maintenance. Sequence analysis reveals that CDC40 is identical to PRP17, a gene involved in pre-mRNA splicing. In this paper, we show that Cdc40p is required at all temperatures for efficient entry
into S-phase and that cell cycle arrest associated with cdc40 mutations is independent of all the known checkpoint mechanisms.
Using immunofluorescence, we show that Cdc40p is localized to the nuclear membrane, weakly associated with the nuclear pore.
Our results point to a link between cell cycle progression, pre-mRNA splicing, and mRNA export.
Received: 9 April 1998 / Accepted: 10 August 1998 |
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Keywords: | Cell cycle mRNA splicing Saccharomyces cerevisiae |
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