Phosphorylation of Ser72 is dispensable for Skp2 assembly into an active SCF ubiquitin ligase and its subcellular localization.

Phosphorylation of Ser72 is dispensable for Skp2 assembly into an active SCF ubiquitin ligase and its subcellular localization.
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DOI:
10.4161/cc.9.5.10914
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发表时间:
2010-03-01
期刊:
Cell cycle (Georgetown, Tex.)
影响因子:
--
通讯作者:
Pagano M
Pagano M
中科院分区:
其他
文献类型:
--
作者:
Bashir T;Pagan JK;Busino L;Pagano M

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F-box 蛋白是 SCF(Skp1、Cul1、F-box 蛋白)泛素连接酶复合物的底物识别亚基。 Skp2 是一种核 F-box 蛋白,以 CDK 抑制剂 p27 为靶点,进行泛素和蛋白酶体依赖性降解。在细胞周期的 G0 和 G1 期,Skp2 通过 APC/CCdh1 泛素连接酶降解,从而稳定 p27 并抑制 CDK,从而促进 G0/G1 状态的维持。 APC/CCdh1 通过 N 末端结构域(人 Skp2 中的氨基酸 46-94)结合 Skp2。研究表明,该结构域中 Ser64 和 Ser72 的磷酸化可将 Skp2 与 APC/C 分离。最近,有人提出 Akt/PKB 对 Ser72 位点上的 Skp2 进行磷酸化,使 Skp2 与 Skp1 结合,促进活性 SCFSkp2 泛素连接酶的组装,以及 Skp2 重新定位/保留到细胞质中,通过未知机制促进细胞迁移。根据这些报道,Skp2 突变体(其中 Ser72 被 Ala 取代)无法促进细胞增殖并失去其致癌潜力。鉴于对比报告,我们重新审视这些结果并得出结论,Skp2 在 Ser72 上的磷酸化不会控制 Skp2 与 Skp1 和 Cul1 的结合,对 SCFSkp2 泛素连接酶活性没有影响,并且不会影响 Skp2 的亚细胞定位。
F-box proteins are the substrate recognition subunits of SCF (Skp1, Cul1, F-box protein) ubiquitin ligase complexes. Skp2 is a nuclear F-box protein that targets the CDK inhibitor p27 for ubiquitin- and proteasome-dependent degradation. In G0 and during the G1 phase of the cell cycle, Skp2 is degraded via the APC/CCdh1 ubiquitin ligase to allow stabilization of p27 and inhibition of CDKs, facilitating the maintenance of the G0/G1 state. APC/CCdh1 binds Skp2 through an N-terminal domain (amino acids 46–94 in human Skp2). It has been shown that phosphorylation of Ser64 and Ser72 in this domain dissociates Skp2 from APC/C. More recently, it has instead been proposed that phosphorylation of Skp2 on Ser72 by Akt/ PKB allows Skp2 binding to Skp1, promoting the assembly of an active SCFSkp2 ubiquitin ligase, and Skp2 relocalization/ retention into the cytoplasm, promoting cell migration via an unknown mechanism. According to these reports, a Skp2 mutant in which Ser72 is substituted with Ala is unable to promote cell proliferation and loses its oncogenic potential. Given the contrasting reports, we revisited these results and conclude that phosphorylation of Skp2 on Ser72 does not control Skp2 binding to Skp1 and Cul1, has no influence on SCFSkp2 ubiquitin ligase activity, and does not affect the subcellular localization of Skp2.
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