Abstract:
:The kinase Cdc2p is a central regulator of entry into and progression through nuclear division during mitosis and meiosis in eukaryotes. Cdc2p is activated at the onset of mitosis by dephosphorylation on tyrosine-15, the phosphorylation status of which is determined mainly by the kinase Wee1p and the phosphatase Cdc25p. In fission yeast, the forkhead-type transcription factor Mei4p is required for expression of many genes during meiosis, with mei4 mutant cells arresting before meiosis I. The mechanism of cell cycle arrest in mei4 cells has remained unknown, however. We now show that cdc25(+) is an important target of Mei4p in control of entry into meiosis I. Forced dephosphorylation of Cdc2p on tyrosine-15 thus induced meiosis I in mei4 mutant cells without a delay, although no spores were formed. We propose that Mei4p acts as a rate-limiting regulator of meiosis I by activating cdc25(+) transcription in coordination with other meiotic events.
journal_name
Proc Natl Acad Sci U S Aauthors
Murakami-Tonami Y,Yamada-Namikawa C,Tochigi A,Hasegawa N,Kojima H,Kunimatsu M,Nakanishi M,Murakami Hdoi
10.1073/pnas.0702906104subject
Has Abstractpub_date
2007-09-11 00:00:00pages
14688-93issue
37eissn
0027-8424issn
1091-6490pii
0702906104journal_volume
104pub_type
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