Structure of TOR and its complex with KOG1

Structure of TOR and its complex with KOG1
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DOI:
10.1016/j.molcel.2007.05.040
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发表时间:
2007-08-03
期刊:
影响因子:
16
通讯作者:
Llorca, Oscar
Llorca, Oscar
中科院分区:
生物学1区
文献类型:
--
作者:
Adami, Alessandra;Garcia-Alvarez, Begona;Llorca, Oscar

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雷帕霉素 (TOR) 的靶标是一种大型 (281 kDa) 保守的 Ser/Thr 蛋白激酶,其功能是细胞生长的中央控制器。 TOR 组装成两个不同的多蛋白复合物:TORC1 和 TORC2。 TORC1 的一个决定性特征是 TOR 与 KOG1(哺乳动物中的 Raptor)的相互作用及其对雷帕霉素-FKBP12 复合物的敏感性。在这里,我们使用电子显微镜在三个维度上重建了内源芽殖酵母 TOR1 和 TOR-KOG1 复合物的 25 A 分辨率结构。 TOR 具有独特的 N 端 HEAT 重复序列,形成弯曲的管状结构域,与 KOG1 的 C 端 WD40 重复结构域相关。 KOG1 的 N 末端靠近 TOR 激酶结构域,可能起到将底物带入催化区域附近的作用。提出了 TOR-KOG1 复合物分子结构的模型,解释其对雷帕霉素的敏感性。
The target of rapamycin (TOR) is a large (281 kDa) conserved Ser/Thr protein kinase that functions as a central controller of cell growth. TOR assembles into two distinct multiprotein complexes: TORC1 and TORC2. A defining feature of TORC1 is the interaction of TOR with KOG1 (Raptor in mammals) and its sensitivity to a rapamycin-FKBP12 complex. Here, we have reconstructed in three dimensions the 25 A resolution structures of endogenous budding yeast TOR1 and a TOR-KOG1 complex, using electron microscopy. TOR features distinctive N-terminal HEAT repeats that form a curved tubular-shaped domain that associates with the C-terminal WD40 repeat domain of KOG1. The N terminus of KOG1 is in proximity to the TOR kinase domain, likely functioning to bring substrates into the vicinity of the catalytic region. A model is proposed for the molecular architecture of the TOR-KOG1 complex explaining its sensitivity to rapamycin.