6VK3

CryoEM structure of Hrd3/Yos9 complex

6VK3 の概要

• エントリーDOI: 10.2210/pdb6vk3/pdb
• EMDBエントリー: 21224
• 分子名称: Hrd3, Protein OS-9 homolog (2 entities in total)
• 機能のキーワード: retro-translocation, erad, protein degradation, ubiquitination, glycan recognition, protein transport
• 由来する生物種: Saccharomyces cerevisiae (Baker's yeast); 詳細
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 145639.31

構造登録者

Wu, X.,Rapoport, T.A. (登録日: 2020-01-18, 公開日: 2020-04-29, 最終更新日: 2024-10-23)

主引用文献

Wu, X.,Siggel, M.,Ovchinnikov, S.,Mi, W.,Svetlov, V.,Nudler, E.,Liao, M.,Hummer, G.,Rapoport, T.A.
Structural basis of ER-associated protein degradation mediated by the Hrd1 ubiquitin ligase complex.
Science, 368:-, 2020

PubMed Abstract: Misfolded luminal endoplasmic reticulum (ER) proteins undergo ER-associated degradation (ERAD-L): They are retrotranslocated into the cytosol, polyubiquitinated, and degraded by the proteasome. ERAD-L is mediated by the Hrd1 complex (composed of Hrd1, Hrd3, Der1, Usa1, and Yos9), but the mechanism of retrotranslocation remains mysterious. Here, we report a structure of the active Hrd1 complex, as determined by cryo-electron microscopy analysis of two subcomplexes. Hrd3 and Yos9 jointly create a luminal binding site that recognizes glycosylated substrates. Hrd1 and the rhomboid-like Der1 protein form two "half-channels" with cytosolic and luminal cavities, respectively, and lateral gates facing one another in a thinned membrane region. These structures, along with crosslinking and molecular dynamics simulation results, suggest how a polypeptide loop of an ERAD-L substrate moves through the ER membrane.

PubMed: 32327568
DOI: 10.1126/science.aaz2449

実験手法

ELECTRON MICROSCOPY (3.7 Å)