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
中科院分区:
文献类型:
--
作者:
Wang, Feng;He, Qing;Zhan, Wenhu;Yu, Ziqi;Finkin-Groner, Efrat;Ma, Xiaojing;Lin, Gang;Li, Huilin
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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发表时间:
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10.1073/pnas.0510664103
发表时间:
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