Structural basis for broad neutralization of ebolaviruses by an antibody targeting the glycoprotein fusion loop.

Structural basis for broad neutralization of ebolaviruses by an antibody targeting the glycoprotein fusion loop.
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DOI:
10.1038/s41467-018-06113-4
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发表时间:
2018-09-26
影响因子:
16.6
通讯作者:
Ofek G
Ofek G
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Janus BM;van Dyk N;Zhao X;Howell KA;Soto C;Aman MJ;Li Y;Fuerst TR;Ofek G

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2014-2016 年西非埃博拉病毒爆发的严重性加快了治疗方法和疫苗的临床开发,尽管现有的对策大多是单一特异性的,并且对之前出现的其他埃博拉病毒物种缺乏疗效。最近的研究表明,埃博拉病毒糖蛋白(GP)融合环是交叉保护性抗体的目标。在这里,我们报告了一种此类交叉保护抗体 CA45 的 3.72 Å 分辨率晶体结构,该抗体与埃博拉病毒 (EBOV) GP 的胞外域结合。 CA45 表位跨越融合环茎的多个面,跨越 GP1 和 GP2 亚基,在 > 99.5% 的已知埃博拉病毒分离株中,约 68% 的残基相同。 GP 上的泛埃博拉病毒小分子抑制剂结合空腔内广泛的抗体相互作用将该空腔定义为免疫脆弱性的新位点。该结构通过 GP 上高度保守的表位阐明了广泛的埃博拉病毒中和作用,并进一步实现了广泛保护性疫苗和疗法的合理设计和开发。埃博拉病毒糖蛋白是交叉保护性抗体的目标。在这里,Janus 等人。报告了与糖蛋白保守表位结合的泛反应性抗体的抗原结合片段的晶体结构,有助于交叉保护性疫苗和治疗方法的合理设计。
The severity of the 2014–2016 ebolavirus outbreak in West Africa expedited clinical development of therapeutics and vaccines though the countermeasures on hand were largely monospecific and lacked efficacy against other ebolavirus species that previously emerged. Recent studies indicate that ebolavirus glycoprotein (GP) fusion loops are targets for cross-protective antibodies. Here we report the 3.72 Å resolution crystal structure of one such cross-protective antibody, CA45, bound to the ectodomain of Ebola virus (EBOV) GP. The CA45 epitope spans multiple faces of the fusion loop stem, across both GP1 and GP2 subunits, with ~68% of residues identical across > 99.5% of known ebolavirus isolates. Extensive antibody interactions within a pan-ebolavirus small-molecule inhibitor binding cavity on GP define this cavity as a novel site of immune vulnerability. The structure elucidates broad ebolavirus neutralization through a highly conserved epitope on GP and further enables rational design and development of broadly protective vaccines and therapeutics. The Ebola virus glycoprotein is a target for cross-protective antibodies. Here, Janus et al. report the crystal structure of the antigen-binding fragment of a pan-reactive antibody bound to a conserved epitope of the glycoprotein, facilitating rational design of cross-protective vaccines and therapeutics.
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