Structural insight into the Ragulator complex which anchors mTORC1 to the lysosomal membrane.

Structural insight into the Ragulator complex which anchors mTORC1 to the lysosomal membrane.
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深入了解将 mTORC1 锚定到溶酶体膜的 Ragulator 复合物。

DOI:
10.1038/celldisc.2017.49
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发表时间:
2017
期刊:
影响因子:
33.5
通讯作者:
Wu G
Wu G
中科院分区:
生物学1区
文献类型:
--
作者:
Mu Z;Wang L;Deng W;Wang J;Wu G

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雷帕霉素(mTOR)信号转导途径的机制靶点在调节代谢过程的许多方面发挥着关键作用。mTOR信号传导途径的中心参与者mTOR复合物1(mTORC 1)被五聚体Ragulator复合物和异二聚体Rag GT3复合物募集到溶酶体膜,然后被激活。在这里,我们确定了人类Ragulator复合物的晶体结构,这表明Lamtor 1具有带状形状,并包裹着其他四个亚基。Lamtor 1和Lamtor 2-Lamtor 3、Lamtor 4-Lamtor 5路障结构域蛋白对之间发生广泛的疏水相互作用,而Lamtor 2-Lamtor 3和Lamtor 4-Lamtor 5亚复合物之间没有实质性接触。有趣的是,来自Lamtor 1的α-螺旋占据了Lamtor 4和Lamtor 5上的每个位置,相当于Lamtor 2和Lamtor 3的α3-螺旋,从而稳定了Lamtor 4和Lamtor 5。Ragulator和酵母Ego 1-Ego 2-Ego 3三元复合物(Ego-TC)之间的结构比较表明,Ego-TC仅对应于Ragulator复合物的一半。耦合的事实,在自我TC结构,自我2和自我3是孤独的路障结构域蛋白,没有另一个路障结构域蛋白与他们配对,我们建议,酵母自我复合物的其他组件可能存在。
The mechanistic target of rapamycin (mTOR) signal-transduction pathway plays a key role in regulating many aspects of metabolic processes. The central player of the mTOR signaling pathway, mTOR complex 1 (mTORC1), is recruited by the pentameric Ragulator complex and the heterodimeric Rag GTPase complex to the lysosomal membrane and thereafter activated. Here, we determined the crystal structure of the human Ragulator complex, which shows that Lamtor1 possesses a belt-like shape and wraps the other four subunits around. Extensive hydrophobic interactions occur between Lamtor1 and the Lamtor2-Lamtor3, Lamtor4-Lamtor5 roadblock domain protein pairs, while there is no substantial contact between Lamtor2-Lamtor3 and Lamtor4-Lamtor5 subcomplexes. Interestingly, an α-helix from Lamtor1 occupies each of the positions on Lamtor4 and Lamtor5 equivalent to the α3-helices of Lamtor2 and Lamtor3, thus stabilizing Lamtor4 and Lamtor5. Structural comparison between Ragulator and the yeast Ego1-Ego2-Ego3 ternary complex (Ego-TC) reveals that Ego-TC only corresponds to half of the Ragulator complex. Coupling with the fact that in the Ego-TC structure, Ego2 and Ego3 are lone roadblock domain proteins without another roadblock domain protein pairing with them, we suggest that additional components of the yeast Ego complex might exist.
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