ジャーナル: Mol Cell / 年: 2025 タイトル: A structural basis for chaperone repression of stress signaling from the endoplasmic reticulum. 著者: Lisa Neidhardt / Joanne Tung / Miriam Kuchersky / Jakub Milczarek / Vasileios Kargas / Katherine Stott / Rina Rosenzweig / David Ron / Yahui Yan / 要旨: The endoplasmic reticulum (ER) unfolded protein response (UPR) is tuned by the balance between unfolded proteins and chaperones. Reserve chaperones suppress UPR transducers via their stress-sensing ...The endoplasmic reticulum (ER) unfolded protein response (UPR) is tuned by the balance between unfolded proteins and chaperones. Reserve chaperones suppress UPR transducers via their stress-sensing luminal domains, but the underlying mechanisms remain unclear. The ER chaperone AGR2 is known to repress the UPR transducer IRE1β. Here, structural prediction, X-ray crystallography, and NMR spectroscopy identify critical interactions between an AGR2 monomer and a regulatory loop in IRE1β's luminal domain. However, in the repressive complex, it is an AGR2 dimer that binds IRE1β. Cryoelectron microscopy (cryo-EM) reconstruction explains this feature: one AGR2 protomer engages the regulatory loop, while the second asymmetrically binds IRE1β's luminal domain's C terminus, blocking IRE1β-activating dimerization. Molecular dynamic simulations indicate that the second, disruptive AGR2 protomer exploits rare fluctuations in the IRE1β dimer that expose its binding site. Thus, AGR2 disrupts IRE1β dimers to suppress the UPR, priming the system for activation by chaperone clients that compete for AGR2.
構造決定の手法: 分子置換 / 解像度: 1.9→67.76 Å / Cor.coef. Fo:Fc: 0.949 / Cor.coef. Fo:Fc free: 0.924 / SU B: 4.957 / SU ML: 0.13 / 交差検証法: THROUGHOUT / ESU R: 0.151 / ESU R Free: 0.14 / 立体化学のターゲット値: MAXIMUM LIKELIHOOD / 詳細: HYDROGENS HAVE BEEN USED IF PRESENT IN THE INPUT
Rfactor
反射数
%反射
Selection details
Rfree
0.2341
2862
5 %
RANDOM
Rwork
0.19948
-
-
-
obs
0.20116
54791
99.57 %
-
溶媒の処理
イオンプローブ半径: 0.8 Å / 減衰半径: 0.8 Å / VDWプローブ半径: 1.2 Å / 溶媒モデル: MASK