- EMDB-65166: Cryo-EM structure of SARS-CoV-2 XBB.1.5 S trimer in the early fus... -
+
データを開く
IDまたはキーワード:
読み込み中...
-
基本情報
登録情報
データベース: EMDB / ID: EMD-65166
タイトル
Cryo-EM structure of SARS-CoV-2 XBB.1.5 S trimer in the early fusion intermediate conformation (E-FIC) complexed with ACE2 and 76E1-Fab (focused refinement of the S2-76E1)
マップデータ
試料
複合体: the local S2-76E1 map of the XBB.1.5 E-FIC-76E1 structure
タンパク質・ペプチド: Spike glycoprotein
タンパク質・ペプチド: heavy chain of 76E1 Fab
タンパク質・ペプチド: light chain of 76E1 Fab
リガンド: 2-acetamido-2-deoxy-beta-D-glucopyranose
キーワード
Spike / ACE2 / and 76E1-Fab complex / VIRAL PROTEIN / IMMUNE SYSTEM / VIRAL PROTEIN-IMMUNE SYSTEM complex
機能・相同性
機能・相同性情報
symbiont-mediated disruption of host tissue / Maturation of spike protein / Translation of Structural Proteins / Virion Assembly and Release / host cell surface / host extracellular region / symbiont-mediated-mediated suppression of host tetherin activity / Induction of Cell-Cell Fusion / structural constituent of virion / positive regulation of viral entry into host cell ...symbiont-mediated disruption of host tissue / Maturation of spike protein / Translation of Structural Proteins / Virion Assembly and Release / host cell surface / host extracellular region / symbiont-mediated-mediated suppression of host tetherin activity / Induction of Cell-Cell Fusion / structural constituent of virion / positive regulation of viral entry into host cell / membrane fusion / host cell endoplasmic reticulum-Golgi intermediate compartment membrane / Attachment and Entry / entry receptor-mediated virion attachment to host cell / receptor-mediated virion attachment to host cell / host cell surface receptor binding / symbiont-mediated suppression of host innate immune response / endocytosis involved in viral entry into host cell / receptor ligand activity / fusion of virus membrane with host plasma membrane / fusion of virus membrane with host endosome membrane / viral envelope / symbiont entry into host cell / virion attachment to host cell / host cell plasma membrane / SARS-CoV-2 activates/modulates innate and adaptive immune responses / virion membrane / membrane / identical protein binding / plasma membrane 類似検索 - 分子機能
National Natural Science Foundation of China (NSFC)
32100751, 92469108
中国
引用
ジャーナル: Nature / 年: 2026 タイトル: Steric hindrance of antibody binding in an Omicron spike fusion intermediate. 著者: Zhiheng Bao / Zhimin Liu / Zhaoyong Zhang / Xuanjia Wang / Xiaohui Jin / Jiaxiu Bai / Hanwen Ma / Yaxin Li / Chunyan Yi / Zhiyang Ling / Zhong Huang / Lu Zhang / Zhenguo Chen / Youhua Xie / ...著者: Zhiheng Bao / Zhimin Liu / Zhaoyong Zhang / Xuanjia Wang / Xiaohui Jin / Jiaxiu Bai / Hanwen Ma / Yaxin Li / Chunyan Yi / Zhiyang Ling / Zhong Huang / Lu Zhang / Zhenguo Chen / Youhua Xie / Yanqun Wang / Lei Sun / Xiaoyu Sun / 要旨: Understanding conformational changes of the coronavirus spike protein is critical for developing broad-spectrum therapies. The pan-coronavirus epitope spike residues 815-825 (centred on the S2' site) ...Understanding conformational changes of the coronavirus spike protein is critical for developing broad-spectrum therapies. The pan-coronavirus epitope spike residues 815-825 (centred on the S2' site) are buried in the prefusion spike but are transiently exposed upon ACE2 binding. Here, using integrated functional and structural analyses, we demonstrate that 76E1, an antibody targeting spike residues 815-825, specifically recognizes an open early fusion intermediate conformation in which this epitope adopts a helical conformation, designated the S2'-helix. SARS-CoV-2 Omicron variants evade such antibodies via steric hindrance resulting from S2'-helix shifts and restricted S1-ACE2 distancing in the early fusion intermediate conformation, together with increased reliance on cathepsin-mediated entry that impairs 76E1 inhibition of S2' cleavage. The H655Y mutation is central to this evasion. Antibody size directly affects its access to the S2'-helix. Crucially, antibody size minimization reversed the evasion mechanisms and significantly enhanced neutralizing activity against authentic Omicron variants and other human coronaviruses, including SARS-CoV-1 and HCoV-229E. These findings establish small-molecule targeting of the S2'-helix as a strategy for pan-coronavirus therapies.