期刊
CELL CYCLE
卷 9, 期 4, 页码 689-699出版社
TAYLOR & FRANCIS INC
DOI: 10.4161/cc.9.4.10611
关键词
CDK4; CDK6; p27; CAK; CDK7; cell cycle signalling
类别
资金
- Communaute franaise de Belgique-Actions de Recherches Concertees
- Belgian Fund for Scientific Medical Research (FRSM)
- National Fund for Scientific Research (FRS-FNRS, Belgium)
Cyclin-dependent kinase (CDK) 4 is a master integrator that couples mitogenic/oncogenic signalling cascades with the inactivation of the central oncosuppressor Rb and the cell cycle. Its activation requires binding to a D-type cyclin and then T-loop phosphorylation at T172 by the only identified CDK-activating kinase in animal cells, cyclin H-CDK7. In contrast with the observed constitutive activity of cyclin H-CDK7, we have recently identified the T172-phosphorylation of cyclin D-bound CDK4 as a crucial cell cycle regulatory target. Intriguingly, the homologous T177-phosphorylation of CDK6 is weak in several systems and does not present this regulation. In this Perspective, we review the recent advances and debates on the multistep mechanism leading to activation of D-type cyclin-CDK4 complexes. This involves a re-evaluation of the implication of Cip/Kip CDK inhibitors and CDK7 in this process.
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