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- W2085165798 abstract "Cyclin(-D-)-dependent kinase (Cdk) inhibitors of the Ink4 family specifically bind to Cdk4 and Cdk6, but not to other Cdks. Ink4c and Ink4d mRNAs are maximally and periodically expressed during the G2/M phase of the cell division cycle, but the abundance of their encoded proteins is regulated through distinct mechanisms. Both proteins undergo polyubiquitination, but the half life of p18Ink4c (~10 hours) is much longer than that of p19Ink4d (~2.5 hours). Lysines 46 and 112 are preferred sites of ubiquitin conjugation in p18Ink4c, although substitution of these and other lysine residues with arginine, particularly in combination, triggers protein misfolding and accelerates p18Ink4c degradation. When tethered to either catalytically active or inactive Cdk4 or Cdk6, polyubiquitination of p18Ink4c is inhibited, and the protein is further stabilized. Conversely, in competing with p18Ink4c for binding to Cdks, cyclin D1 accelerates p18Ink4c turnover. In direct contrast, polyubiquitination of p19Ink4d is induced by its association with Cdks, whereas cyclin D1 overexpression retards p19Ink4d degradation. Although it has been generally assumed that p18Ink4c and p19Ink4d are biochemically similar Cdk inhibitors, the major differences in their stability and turnover are likely key to understanding their distinct biological functions." @default.
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- W2085165798 date "2008-12-01" @default.
- W2085165798 modified "2023-10-11" @default.
- W2085165798 title "Differential post-transcriptional regulation of two Ink4 proteins, p18Ink4c and p19Ink4d" @default.
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- W2085165798 doi "https://doi.org/10.4161/cc.7.23.7187" @default.
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