Abstract：
:Eukaryotic cell cycles are controlled by the activities of cyclin-dependent kinases (cdks). The major cdk in budding yeast, Saccharomyces cerevisiae, is Cdc28p. Activation of Cdc28p requires phosphorylation on threonine 169 and binding to a cyclin. Thr-169 is phosphorylated by the cdk-activating kinase (CAK), Cak1p, which was recently identified as the physiological CAK in budding yeast. Here we present our further characterization of yeast Cak1p. We have found that Cak1p is dispersed throughout the cell as shown by immunofluorescence; biochemical subcellular fractionation confirmed that most of the Cak1p is found in the cytoplasm. Cak1p is a monomeric enzyme in crude yeast lysates. Mutagenesis of potential sites of activating phosphorylation had little effect on the activity of Cak1p in vitro or in vivo. Furthermore, Cak1p contains no posttranslational modifications detectable by two-dimensional isoelectric focusing. We found that Cak1p is a stable protein during exponential growth but that its expression decreases considerably when cells enter stationary phase. In contrast, Cak1p levels oscillate dramatically during meiosis, reflecting regulation at both the transcriptional and post-translational level. The localization and regulation of Cak1p are in contrast to those of the known vertebrate CAK, p40(MO15).
journal_name
J Cell Scijournal_title
Journal of cell scienceauthors
Kaldis P,Pitluk ZW,Bany IA,Enke DA,Wagner M,Winter E,Solomon MJsubject
Has Abstractpub_date
1998-12-18 00:00:00pages
3585-96eissn
0021-9533issn
1477-9137journal_volume
111 ( Pt 24)pub_type
杂志文章abstract：:division abnormally delayed (dally) encodes an integral membrane proteoglycan of the glypican family that affects a number of patterning events during both embryonic and larval development. Earlier studies demonstrated that Dally regulates cellular responses to Wingless (Wg) and Decapentaplegic (Dpp) in a tissue-speci...
journal_title：Journal of cell science
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pub_type： 杂志文章,评审
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journal_title：Journal of cell science
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pub_type： 杂志文章
doi：10.1242/jcs.116533
更新日期：2012-12-15 00:00:00
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journal_title：Journal of cell science
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journal_title：Journal of cell science
pub_type： 杂志文章
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journal_title：Journal of cell science
pub_type： 杂志文章
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pub_type： 杂志文章,评审
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更新日期：2018-04-13 00:00:00
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journal_title：Journal of cell science
pub_type： 杂志文章
doi：
更新日期：1994-08-01 00:00:00
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pub_type： 杂志文章,评审
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更新日期：2015-06-15 00:00:00
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journal_title：Journal of cell science
pub_type： 杂志文章
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更新日期：2011-08-01 00:00:00
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pub_type： 杂志文章
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journal_title：Journal of cell science
pub_type： 杂志文章
doi：
更新日期：1990-05-01 00:00:00
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journal_title：Journal of cell science
pub_type： 杂志文章
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更新日期：2010-12-15 00:00:00
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journal_title：Journal of cell science
pub_type： 杂志文章
doi：
更新日期：1997-11-01 00:00:00
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journal_title：Journal of cell science
pub_type： 杂志文章
doi：10.1242/jcs.02349
更新日期：2005-05-15 00:00:00
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journal_title：Journal of cell science
pub_type： 杂志文章
doi：
更新日期：1991-05-01 00:00:00
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journal_title：Journal of cell science
pub_type： 杂志文章
doi：
更新日期：1996-07-01 00:00:00
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journal_title：Journal of cell science
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doi：
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journal_title：Journal of cell science
pub_type： 杂志文章
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更新日期：2008-06-15 00:00:00
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journal_title：Journal of cell science
pub_type： 杂志文章
doi：
更新日期：1999-05-01 00:00:00
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journal_title：Journal of cell science
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journal_title：Journal of cell science
pub_type： 杂志文章
doi：
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journal_title：Journal of cell science
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