Structural basis of DEPTOR to recognize phosphatidic acid using its tandem DEP domains.

Structural basis of DEPTOR to recognize phosphatidic acid using its tandem DEP domains.
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DEPTOR 使用其串联 DEP 结构域识别磷脂酸的结构基础。

DOI:
10.1016/j.jmb.2021.166989
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发表时间:
2021
影响因子:
5.6
通讯作者:
Yingfang Liu
Yingfang Liu
中科院分区:
生物学2区
文献类型:
--
作者:
Z. Weng;X. Shen;Jiefu Zheng;Huanhuan Liang;Yingfang Liu

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含DEP结构域的mTOR相互作用蛋白(DEPTOR)是mTOR信号通路的内源性抑制剂,在调节代谢、生长、自噬和凋亡等方面发挥重要作用。在mTOR信号传导的第二信使磷脂酸的激活下,DEPTOR以未知的机制从mTORC 1复合物中解离。在这里,我们提出了一个1.5 μ m分辨率的晶体结构,这表明hDEPTOR的N-末端两个串联DEP结构域折叠成哑铃形结构,突出的DEP结构域的特征β-发夹臂的每一侧。DEP 2末端的18个氨基酸DDEX基序与DEP 1相互作用并稳定结构。生化研究表明,串联DEP结构域直接相互作用与磷脂酸使用两个不同的正电荷补丁。这些结果提供了对磷脂酸刺激后mTOR活化的见解。
DEP domain containing mTOR-interacting protein (DEPTOR) plays pivotal roles in regulating metabolism, growth, autophagy and apoptosis by functions as an endogenous inhibitor of mTOR signaling pathway. Activated by phosphatidic acid, a second messenger in mTOR signaling, DEPTOR dissociates from mTORC1 complex with unknown mechanism. Here, we present a 1.5 Å resolution crystal structure, which shows that the N-terminal two tandem DEP domains of hDEPTOR fold into a dumbbell-shaped structure, protruding the characteristic β-hairpin arms of DEP domains on each side. An 18 amino acids DDEX motif at the end of DEP2 interacts with DEP1 and stabilizes the structure. Biochemical studies showed that the tandem DEP domains directly interact with phosphatidic acid using two distinct positively charged patches. These results provide insights into mTOR activation upon phosphatidic acid stimulation.
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