利用库贝病毒平台绘制埃博拉病毒糖蛋白的免疫学、宿主受体结合决定簇和组织蛋白酶切割位点图谱。

Mapping Immunological, Host Receptor Binding Determinants, and Cathepsin Cleavage Site of EBOV Glycoprotein Utilizing the Qubevirus Platform.

作者信息

Ntemafack Augustin, Dzelamonyuy Aristide, Nchinda Godwin, Bopda Waffo Alain

机构信息

Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, 635 Barnhill, Indianapolis, Indiana46202-3082, United States.

Laboratory of Vaccinology and Biobanking, CIRCB, BP 3077 Messa, Yaoundé 03077, Cameroon.

出版信息

ACS Omega. 2025 Mar 31;10(14):14283-14295. doi: 10.1021/acsomega.5c00408. eCollection 2025 Apr 15.

Abstract

Ebola virus (EBOV) remains a highly infectious human pathogen that causes a severe and lethal disease known as Ebola virus disease (EVD), despite recent progress in vaccine development based on its only surface glycoprotein (GP). In this study, we modeled and inserted four overlapping fragments (F1-4) of the EBOV GP at the C-terminus of the A protein of Qubevirus (Qβ) and used the platform to investigate the tropism and immunological functions of the GP by displaying the peptides with 30 overlapping amino acids. The resulting recombinant phages were used to determine their reactivity with GP-specific antibodies and their binding to the recombinant Niemann-Pick C1 (rNPC1) receptor in an immunoassay. In addition, modified, truncated, and C-terminus-tagged fragment F1 named F5 was utilized to map the cathepsin cleavage sites in an enzymatic assay. We demonstrated that a large GP peptide of 200 AA could be fused to A and exposed on the Qβ platform in an accessible manner without significantly affecting its viability and infectivity. Fragments F1 (GP1-200), F2 (GP170-370), and F3 (GP350-550) were shown to contain important immune epitopes through binding to anti-GP-specific antibodies. Further, F1 was found to bind rNPC1, thereby suggesting a receptor binding determinant of the GP that was further confirmed in a competitive assay where the recombinant phages bearing the F1 fragment reduced the infectivity of EBOV pseudovirus by 27%. In addition, the viral infectivity was shown to be reduced by 46.39% by a cyclic peptide selected from an RNA Qβ library. Finally, F5 showed the cleavage sites to be AA191-192 and AA194-195 for CatB and L, respectively, which were further validated using a recombinant EBOV glycoprotein. These results provide insights into the antigenicity and tropism characteristic of the glycoprotein, with implications for the development of subunit vaccines or other biologics against Ebola virus disease.

摘要

尽管基于埃博拉病毒(EBOV)唯一的表面糖蛋白(GP)在疫苗开发方面取得了进展,但埃博拉病毒仍是一种极具传染性的人类病原体,可引发一种严重的致命疾病,即埃博拉病毒病(EVD)。在本研究中,我们将EBOV GP的四个重叠片段(F1 - 4)建模并插入到噬菌体Qβ病毒(Qβ)A蛋白的C末端,并利用该平台通过展示具有30个重叠氨基酸的肽段来研究GP的嗜性和免疫功能。所得重组噬菌体用于在免疫测定中确定它们与GP特异性抗体的反应性以及它们与重组尼曼 - 皮克C1(rNPC1)受体的结合。此外,利用修饰、截短并在C末端标记的片段F1(命名为F5)在酶促测定中绘制组织蛋白酶切割位点。我们证明了一个200个氨基酸的大GP肽可以与A融合并以可及的方式暴露在Qβ平台上,而不会显著影响其活力和感染性。片段F1(GP1 - 200)、F2(GP170 - 370)和F3(GP350 - 550)通过与抗GP特异性抗体结合显示含有重要的免疫表位。此外,发现F1与rNPC1结合,从而提示了GP的受体结合决定簇,这在竞争性测定中得到进一步证实,其中携带F1片段的重组噬菌体使EBOV假病毒的感染性降低了27%。此外, 从RNA Qβ文库中选择的一个环肽使病毒感染性降低了46.39%。最后,F5显示CatB和L的切割位点分别为AA191 - 192和AA194 - 195,这使用重组EBOV糖蛋白进一步得到验证。这些结果为糖蛋白的抗原性和嗜性特征提供了见解,对埃博拉病毒病亚单位疫苗或其他生物制品的开发具有启示意义。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b33e/12004191/1175bcc95568/ao5c00408_0001.jpg

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