研究揭示漢坦病毒表面糖蛋白晶格及其融合控制機制
作者:
小柯機器人發布時間:2020/9/17 16:08:45
近日,法國巴斯德研究所Pablo Guardado-Calvo、Felix A. Rey等研究人員合作揭示漢坦病毒表面糖蛋白晶格及其融合控制機制。這一研究成果於2020年9月15日在線發表在《細胞》上。
研究人員表示,漢坦病毒是齧齒動物傳播的病毒,在世界範圍內引起嚴重的人畜共患病爆發,目前尚無治療方法。漢坦病毒顆粒是多形的,並顯示出特徵性的方形表面晶格。包膜糖蛋白Gn和Gc形成異二聚體,這些異二聚體進一步組裝成四聚體峰,即晶格結構單元。糖蛋白是中和抗體的唯一靶標,它通過受體介導的內吞作用和內吞體膜融合來驅動病毒進入。
研究人員描述了Gc和Gn的同源四聚體以及Gn基底異源二聚體的高解析度X射線結構。它們對接到漢坦病毒表面的11.4Å解析度冷凍電子斷層掃描圖說明了病毒糖蛋白殼的完整膜外部分,並可以詳細描述這些多形病毒體的表面組織。這些結果進一步揭示了控制Gc膜插入來融合的內在機制,從而為設計免疫原來預防病原性漢坦病毒鋪平了道路。
附:英文原文
Title: The Hantavirus Surface Glycoprotein Lattice and Its Fusion Control Mechanism
Author: Alexandra Serris, Robert Stass, Eduardo A. Bignon, Nicolás A. Muena, Jean-Claude Manuguerra, Rohit K. Jangra, Sai Li, Kartik Chandran, Nicole D. Tischler, Juha T. Huiskonen, Felix A. Rey, Pablo Guardado-Calvo
Issue&Volume: 2020-09-15
Abstract: Hantaviruses are rodent-borne viruses causing serious zoonotic outbreaks worldwidefor which no treatment is available. Hantavirus particles are pleomorphic and displaya characteristic square surface lattice. The envelope glycoproteins Gn and Gc formheterodimers that further assemble into tetrameric spikes, the lattice building blocks.The glycoproteins, which are the sole targets of neutralizing antibodies, drive virusentry via receptor-mediated endocytosis and endosomal membrane fusion. Here we describethe high-resolution X-ray structures of the heterodimer of Gc and the Gn head andof the homotetrameric Gn base. Docking them into an 11.4--resolution cryoelectrontomography map of the hantavirus surface accounted for the complete extramembraneportion of the viral glycoprotein shell and allowed a detailed description of thesurface organization of these pleomorphic virions. Our results, which further revealeda built-in mechanism controlling Gc membrane insertion for fusion, pave the way forimmunogen design to protect against pathogenic hantaviruses.
DOI: 10.1016/j.cell.2020.08.023
Source: https://www.cell.com/cell/fulltext/S0092-8674(20)31064-3
Cell:《細胞》,創刊於1974年。隸屬於細胞出版社,最新IF:36.216