Mechanistic understanding of N-glycosylation in Ebola virus glycoprotein maturation and function

Mechanistic understanding of N-glycosylation in Ebola virus glycoprotein maturation and function
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埃博拉病毒糖蛋白成熟和功能中 N-糖基化的机制理解

DOI:
10.1074/jbc.m116.768168
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发表时间:
2017-02
影响因子:
4.8
通讯作者:
Yong-Hui Zheng
Yong-Hui Zheng
中科院分区:
生物学2区
文献类型:
--
作者:
Bin Wang;Yujie Wang;Dylan Frubutt;Xihe Zhang;Xiaoyu Yao;Dan Hu;Zhuo Zhang;Chaonan Liu;Shimin Zheng;Shi-Hua Xiang;Yong-Hui Zheng

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埃博拉病毒(EBOV)三聚体包膜糖蛋白(GP)前体被切割成受体结合GP 1和融合介导GP 2亚基,并掺入病毒体中以启动感染。GP 1和GP 2分别形成具有15个或两个N-糖基化位点(NGS)的异二聚体。在这里,我们研究了如何N-糖基化有助于GP的表达,成熟和功能的机制。如前所述,我们发现,虽然GP 1 NGS不是关键的,但两个GP 2 NGS,Asn 563和Asn 618,对于GP功能是必需的。进一步的分析发现,Asn 563和Asn 618调节GP加工,甘露糖基化,寡聚化和构象。因此,这两个NGS是GP掺入EBOV样颗粒和HIV 1型(HIV-1)假病毒体所必需的,并决定了病毒转导效率。使用CRISPR/Cas9技术,我们敲除了两种经典的内质网伴侣钙连接蛋白(CNX)和/或钙网蛋白(CRT),发现CNX和CRT都增加了GP的表达。然而,GP与CNX或CRT的相互作用不需要NGS。总之,我们得出结论,虽然Asn 563和Asn 618不是EBOV GP表达所必需的,但它们协同调节其成熟,这决定了其功能。
The Ebola virus (EBOV) trimeric envelope glycoprotein (GP) precursors are cleaved into the receptor-binding GP1 and the fusion-mediating GP2 subunits and incorporated into virions to initiate infection. GP1 and GP2 form heterodimers that have 15 or two N-glycosylation sites (NGSs), respectively. Here we investigated the mechanism of how N-glycosylation contributes to GP expression, maturation, and function. As reported before, we found that, although GP1 NGSs are not critical, the two GP2 NGSs, Asn563 and Asn618, are essential for GP function. Further analysis uncovered that Asn563 and Asn618 regulate GP processing, demannosylation, oligomerization, and conformation. Consequently, these two NGSs are required for GP incorporation into EBOV-like particles and HIV type 1 (HIV-1) pseudovirions and determine viral transduction efficiency. Using CRISPR/Cas9 technology, we knocked out the two classical endoplasmic reticulum chaperones calnexin (CNX) and/or calreticulin (CRT) and found that both CNX and CRT increase GP expression. Nevertheless, NGSs are not required for the GP interaction with CNX or CRT. Together, we conclude that, although Asn563 and Asn618 are not required for EBOV GP expression, they synergistically regulate its maturation, which determines its functionality.
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