The E3 Ubiquitin Ligase SCF(Cyclin F) Transmits AKT Signaling to the Cell-Cycle Machinery.

The E3 Ubiquitin Ligase SCF(Cyclin F) Transmits AKT Signaling to the Cell-Cycle Machinery.
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DOI:
10.1016/j.celrep.2017.08.099
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发表时间:
2017-09-26
期刊:
影响因子:
8.8
通讯作者:
Emanuele MJ
Emanuele MJ
中科院分区:
生物学1区
文献类型:
--
作者:
Choudhury R;Bonacci T;Wang X;Truong A;Arceci A;Zhang Y;Mills CA;Kernan JL;Liu P;Emanuele MJ

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致癌AKT激酶是细胞凋亡、细胞生长和细胞周期进程的关键调节因子。尽管AKT在增殖中发挥重要作用,但其与细胞周期的机械联系在很大程度上仍然未知。我们在这里表明,细胞周期蛋白F,E3泛素连接酶SCF家族的底物受体F盒蛋白,是一个真正的AKT底物。细胞周期蛋白F的表达在整个细胞周期中振荡,这是69种人F盒蛋白中的一种罕见特征,并且其所有已知底物都参与增殖。细胞周期蛋白F的AKT磷酸化增强其稳定性并促进组装成生产性E3连接酶复合物。重要的是,不能被AKT磷酸化的细胞周期蛋白F的突变形式的表达损害细胞周期进入。我们的数据表明,细胞周期蛋白F通过AKT传递有丝分裂原信号到核心细胞周期机制。这一发现对AKT被激活的恶性肿瘤的增殖控制具有潜在意义。Choudhury等报道,细胞周期蛋白F,一种E3泛素连接酶底物受体F盒蛋白,被致癌激酶AKT磷酸化。有趣的是,磷酸化增强细胞周期蛋白F的稳定性,促进细胞周期的进入。这些数据表明,细胞周期蛋白F桥梁生长因子的核心细胞周期机制。
The oncogenic AKT kinase is a key regulator of apoptosis, cell growth and cell cycle progression. Despite its important role in proliferation, it remains largely unknown how AKT is mechanistically linked to cell cycle. We show here that Cyclin F, a substrate receptor F-box protein for the SCF family of E3 ubiquitin ligases, is a bona fide AKT substrate. Cyclin F expression oscillates throughout the cell cycle, a rare feature among the 69 human F-box proteins, and all of its known substrates are involved in proliferation. AKT phosphorylation of Cyclin F enhances its stability and promotes assembly into productive E3 ligase complexes. Importantly, expression of mutant versions of Cyclin F that cannot be phosphorylated by AKT impair cell cycle entry. Our data suggest that Cyclin F transmits mitogen signaling through AKT to the core cell cycle machinery. This discovery has potential implications for proliferative control in malignancies where AKT is activated. Choudhury et al. report that Cyclin F, an E3 ubiquitin ligase substrate receptor F-box protein, is phosphorylated by the oncogenic kinase AKT. Intriguingly, phosphorylation enhances Cyclin F stability and promotes cell cycle entry. These data suggest that Cyclin F bridges growth factor to the core cell cycle machinery.
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