Structure of the human UBR5 E3 ubiquitin ligase.

Structure of the human UBR5 E3 ubiquitin ligase.
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DOI:
10.1016/j.str.2023.03.010
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发表时间:
2023-05-04
期刊:
影响因子:
5.7
通讯作者:
Li, Huilin
Li, Huilin
中科院分区:
生物学2区
文献类型:
--
作者:
Wang, Feng;He, Qing;Zhan, Wenhu;Yu, Ziqi;Finkin-Groner, Efrat;Ma, Xiaojing;Lin, Gang;Li, Huilin

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人UBR 5是哺乳动物胚胎发育所必需的单链多肽HECT型E3泛素连接酶。UBR 5的功能失调,就像一种癌蛋白,促进癌症的生长和转移。在这里,我们报告UBR 5组装成二聚体和四聚体。我们的cryo-EM结构揭示了两个新月形UBR 5单体头对尾组装形成二聚体,并且两个二聚体面对面结合形成笼状四聚体,其中所有四个催化HECT结构域面向中心腔。重要的是,一个亚基的N-末端区域和另一个亚基的HECT在二聚体中形成“分子间钳口”。我们发现颚衬残基是重要的功能,这表明分子间颚功能,以招募泛素负载的E2 UBR 5。需要进一步的工作来了解寡聚化如何调节UBR 5连接酶活性。这项工作为基于结构的抗癌药物开发提供了一个框架,并有助于对E3连接酶多样性的日益重视。
The human UBR5 is a single polypeptide chain HECT-type E3 ubiquitin ligase essential for embryonic development in mammals. Dysregulated UBR5 functions like an oncoprotein to promote cancer growth and metastasis. Here we report that UBR5 assembles into a dimer and tetramer. Our cryo-EM structures reveal that two crescent-shaped UBR5 monomers assemble head-to-tail to form the dimer, and two dimers bind face-to-face to form the cage-like tetramer with all four catalytic HECT domains facing the central cavity. Importantly, the N-terminal region of one subunit and the HECT of the other form an “intermolecular jaw” in the dimer. We show the jaw-lining residues are important for function, suggesting that the intermolecular jaw functions to recruit ubiquitin-loaded E2 to UBR5. Further work is needed to understand how oligomerization regulates the UBR5 ligase activity. This work provides a framework for structure-based anticancer drug development and contributes to a growing appreciation of E3 ligase diversity.
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