A Skp2 autoinduction loop and restriction point control.
A Skp2 autoinduction loop and restriction point control.
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DOI:
10.1083/jcb.200703034
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发表时间:
2007-08-27
期刊:
影响因子:
--
通讯作者:
Assoian RK
中科院分区:
文献类型:
--
作者:
Yung Y;Walker JL;Roberts JM;Assoian RK
We describe a self-amplifying feedback loop that autoinduces Skp2 during G1 phase progression. This loop, which contains Skp2 itself, p27kip1 (p27), cyclin E–cyclin dependent kinase 2, and the retinoblastoma protein, is closed through a newly identified, conserved E2F site in the Skp2 promoter. Interference with the loop, by knockin of a Skp2-resistant p27 mutant (p27T187A), delays passage through the restriction point but does not interfere with S phase entry under continuous serum stimulation. Skp2 knock down inhibits S phase entry in nontransformed mouse embryonic fibroblasts but not in human papilloma virus–E7 expressing fibroblasts. We propose that the essential role for Skp2-dependent degradation of p27 is in the formation of an autoinduction loop that selectively controls the transition to mitogen-independence, and that Skp2-dependent proteolysis may be dispensable when pocket proteins are constitutively inactivated.
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