Structure of the human mTOR complex I and its implications for rapamycin inhibition.

Structure of the human mTOR complex I and its implications for rapamycin inhibition.
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DOI:
10.1016/j.molcel.2010.05.017
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发表时间:
2010-06-11
期刊:
影响因子:
16
通讯作者:
Kang SA
Kang SA
中科院分区:
生物学1区
文献类型:
--
作者:
Yip CK;Murata K;Walz T;Sabatini DM;Kang SA

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哺乳动物雷帕霉素靶蛋白复合物1(mTORC 1)调节细胞生长,以响应细胞的营养和能量状态,其失调在人类癌症中很常见。很少有人知道的整体架构和亚基组织的这一重要的信号复合物。我们已经确定了三维(3D)结构的完全组装的人mTORC 1冷冻电子显微镜(cryo-EM)。我们的分析表明,mTORC 1是一个专性二聚体与整体菱形形状和中央腔。二聚体界面通过mTOR和raptor亚基之间的互锁相互作用形成。与FKBP 12-雷帕霉素的延长孵育以逐步的方式损害mTORC 1的结构完整性,这使得我们提出了一种模型,其中雷帕霉素通过不同的机制抑制mTORC 1介导的4 E-BP 1和S6 K1的磷酸化。
The mammalian Target of Rapamycin Complex 1 (mTORC1) regulates cell growth in response to the nutrient and energy status of the cell, and its deregulation is common in human cancers. Little is known about the overall architecture and subunit organization of this essential signaling complex. We have determined the three-dimensional (3D) structure of the fully assembled human mTORC1 by cryo-electron microscopy (cryo-EM). Our analyses reveal that mTORC1 is an obligate dimer with an overall rhomboid shape and a central cavity. The dimeric interfaces are formed by interlocking interactions between the mTOR and raptor subunits. Extended incubation with FKBP12-rapamycin compromises the structural integrity of mTORC1 in a stepwise manner, leading us to propose a model in which rapamycin inhibits mTORC1-mediated phosphorylation of 4E-BP1 and S6K1 through different mechanisms.
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