Golgi-associated RhoBTB3 targets cyclin E for ubiquitylation and promotes cell cycle progression.

Golgi-associated RhoBTB3 targets cyclin E for ubiquitylation and promotes cell cycle progression.
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DOI:
10.1083/jcb.201305158
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发表时间:
2013-10-28
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Pfeffer SR
Pfeffer SR
中科院分区:
其他
文献类型:
--
作者:
Lu A;Pfeffer SR

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高尔基体蛋白 RhoBTB3 与 CUL3 和 RBX1 复合,促进细胞周期蛋白 E 泛素化,使其在 S 期进行周转并在细胞周期中进展。 Cyclin E 调节细胞周期从 G1 期向 S 期的转变,并在进入 G2 期之前被降解。在这里,我们展示了 RhoBTB3(一种高尔基体相关、Rho 相关 ATP 酶)通过靶向 Cyclin E 进行泛素化来调节细胞周期的 S/G2 转换。 RhoBTB3 的耗尽使细胞停滞在 S 期,引发高尔基体断裂,并升高细胞周期蛋白 E 水平。在高尔基体上,RhoBTB3 与 Cyclin E 结合,作为 Cullin3 (CUL3) 依赖性 RING-E3 泛素连接酶复合物的一部分,该复合物由 RhoBTB3、CUL3 和 RBX1 组成。该复合物与高尔基体的关联是其催化细胞周期蛋白 E 泛素化并允许正常细胞周期进展的能力所必需的。这些实验揭示了 Ras 超家族成员在 S 期催化细胞周期蛋白 E 更新中的新作用,以及高尔基体作为细胞周期控制的泛素化平台的意想不到的重要作用。
The Golgi protein RhoBTB3 in complex with CUL3 and RBX1 promotes Cyclin E ubiquitylation to allow its turnover during S phase and progression through the cell cycle. Cyclin E regulates the cell cycle transition from G1 to S phase and is degraded before entry into G2 phase. Here we show that RhoBTB3, a Golgi-associated, Rho-related ATPase, regulates the S/G2 transition of the cell cycle by targeting Cyclin E for ubiquitylation. Depletion of RhoBTB3 arrested cells in S phase, triggered Golgi fragmentation, and elevated Cyclin E levels. On the Golgi, RhoBTB3 bound Cyclin E as part of a Cullin3 (CUL3)-dependent RING–E3 ubiquitin ligase complex comprised of RhoBTB3, CUL3, and RBX1. Golgi association of this complex was required for its ability to catalyze Cyclin E ubiquitylation and allow normal cell cycle progression. These experiments reveal a novel role for a Ras superfamily member in catalyzing Cyclin E turnover during S phase, as well as an unexpected, essential role for the Golgi as a ubiquitylation platform for cell cycle control.
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