Abstract:
:The Cip/Kip family of cyclin-dependent kinase (Cdk) inhibitors includes p21(Cip1), p27(Kip1) and p57(Kip2). Their kinase inhibitory activities are mediated by a homologous N-terminal kinase inhibitory domain. The Cdk inhibitory activity and stability of p27 have been shown to be regulated by a two-step phosphorylation mechanism involving a tyrosine residue within the kinase inhibitory domain and a threonine residue within the flexible C-terminus. We show that these residues are conserved in p21 and p57, suggesting that a similar phosphorylation cascade regulates these Cdk inhibitors. However, the presence of a cyclin binding motif within its C-terminus alters the regulatory interplay between p21 and Cdk2/cyclin A, as well as its responses to tyrosine phosphorylation and altered p21:Cdk2/cyclin A stoichiometry. We also show that the Cip/Kip proteins can be phosphorylated in vitro by representatives of many non-receptor tyrosine kinase (NRTK) sub-families, suggesting that NRTKs may generally regulate the activity and stability of these Cdk inhibitors. Our results further suggest that the Cip/Kip proteins integrate signals from various NRTK pathways and cell cycle regulation.
journal_name
J Mol Bioljournal_title
Journal of molecular biologyauthors
Huang Y,Yoon MK,Otieno S,Lelli M,Kriwacki RWdoi
10.1016/j.jmb.2014.11.011subject
Has Abstractpub_date
2015-01-30 00:00:00pages
371-386issue
2eissn
0022-2836issn
1089-8638pii
S0022-2836(14)00591-9journal_volume
427pub_type
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