Regulation of the CRL4(Cdt2) ubiquitin ligase and cell-cycle exit by the SCF(Fbxo11) ubiquitin ligase.

Regulation of the CRL4(Cdt2) ubiquitin ligase and cell-cycle exit by the SCF(Fbxo11) ubiquitin ligase.
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DOI:
10.1016/j.molcel.2013.02.004
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发表时间:
2013-03-28
期刊:
影响因子:
16
通讯作者:
Pagano, Michele
Pagano, Michele
中科院分区:
生物学1区
文献类型:
--
作者:
Rossi, Mario;Duan, Shanshan;Jeong, Yeon-Tae;Horn, Moritz;Saraf, Anita;Florens, Laurence;Washburn, Michael P.;Antebi, Adam;Pagano, Michele

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F-box蛋白和DCAF蛋白分别是SCF(Skp 1-Cul 1-F-box蛋白)和CRL 4(Cul 4-RING蛋白连接酶)泛素连接酶复合物的底物结合亚基。使用亲和纯化和质谱,我们确定了F-box蛋白FBXO 11与CDT 2相互作用,CDT 2是一种控制细胞周期进程的DCAF蛋白,并将CDT 2招募到SCFFBXO 11复合物中以促进其蛋白酶体降解。与大多数SCF底物(其表现出与F-box蛋白的磷酸化降解决定子依赖性结合)相反,CDT 2降解决定子中存在的CDK介导的Thr 464磷酸化抑制FBXO 11的识别。最后,我们的研究结果表明,FBXO 11和CDT 2之间的功能相互作用是进化保守的蠕虫到人类,并在调节细胞周期退出的时间起着重要的作用。
F-box proteins and DCAF proteins are the substrate binding subunits of SCF (Skp1-Cul1-F-box protein) and CRL4 (Cul4-RING protein Ligase) ubiquitin ligase complexes, respectively. Using affinity purification and mass spectrometry, we determined that the F-box protein FBXO11 interacts with CDT2, a DCAF protein that controls cell cycle progression, and recruits CDT2 to the SCFFBXO11 complex to promote its proteasomal degradation. In contrast to most SCF substrates, which exhibit phosphodegrondependent binding to F-box proteins, CDK-mediated phosphorylation of Thr464 present in the CDT2 degron inhibits recognition by FBXO11. Finally, our results show that the functional interaction between FBXO11 and CDT2 is evolutionary conserved from worms to humans and plays an important role in regulating the timing of cell cycle exit.
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