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:
The Journal of cell biology
影响因子:
--
通讯作者:
Assoian RK
Assoian RK
中科院分区:
其他
文献类型:
--
作者:
Yung Y;Walker JL;Roberts JM;Assoian RK

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我们描述了一个自放大的反馈回路,在G1期进展过程中自动诱导Skp 2。该环包含Skp 2本身、p27 kip 1(p27)、细胞周期蛋白E-细胞周期蛋白依赖性激酶2和视网膜母细胞瘤蛋白,通过Skp 2启动子中新鉴定的保守E2 F位点闭合。通过敲入Skp 2抗性p27突变体(p27 T187 A)干扰环,延迟通过限制点,但在连续血清刺激下不干扰S期进入。Skp 2敲低抑制非转化小鼠胚胎成纤维细胞进入S期,但不抑制表达人乳头状瘤病毒E7的成纤维细胞进入S期。我们建议,Skp 2依赖性降解p27的重要作用是在形成一个自动诱导循环,选择性地控制过渡到分裂原的独立性,和Skp 2依赖性蛋白水解可能会被破坏时,口袋蛋白组成性失活。
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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