CryoEM Structure of an Influenza Virus Receptor-Binding Site Antibody-Antigen Interface.

CryoEM Structure of an Influenza Virus Receptor-Binding Site Antibody-Antigen Interface.
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DOI:
10.1016/j.jmb.2017.05.011
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发表时间:
2017-06-16
影响因子:
5.6
通讯作者:
Grigorieff N
Grigorieff N
中科院分区:
生物学2区
文献类型:
--
作者:
Liu Y;Pan J;Jenni S;Raymond DD;Caradonna T;Do KT;Schmidt AG;Harrison SC;Grigorieff N

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基于结构的疫苗设计依赖于对抗原-抗体复合体的广泛结构分析。单粒子电子冷冻显微镜(CryoEM)可以绕过X射线结晶学的一些问题,作为获得所需结构的管道。通过研究一种在人类对流感疫苗的免疫反应的扩展项目中未能结晶的复合体,我们研究了单颗粒低温EM在确定流感病毒血凝素(HA):单链抗体(ScFv)复合体结构的潜力。结果表明,尽管棒状HA三聚体扭曲程度的微小变化将总分辨率限制在约4.5奥时,但结合低温EM和分子建模可以得到抗原:抗体界面的细节。对主要3D类别的比较提出了修改HA三聚体以克服这一限制的方法。来自同一捐赠者的密切相关抗体在与同一HA结合时确实产生晶体,使我们能够独立验证冷冻EM结果。这两种结构还增强了我们对抗体识别受体结合部位的理解,这些抗体中和了广泛的流感病毒变体。
Structure-based vaccine design depends on extensive structural analyses of antigen-antibody complexes. Single-particle electron cryomicroscopy (cryoEM) can circumvent some of the problems of x-ray crystallography as a pipeline for obtaining the required structures. We have examined the potential of single-particle cryoEM for determining the structure of influenza-virus hemagglutinin (HA):single-chain Fv (scFv) complexes, by studying a complex we failed to crystallize in pursuing an extended project of the human immune response to influenza vaccines. The result shows that a combination of cryoEM and molecular modeling can yield details of the antigen:antibody interface, although small variation in the twist of the rod-like HA trimer limited the overall resolution to about 4.5Å. Comparison of principal 3D classes suggests ways to modify the HA trimer to overcome this limitation. A closely related antibody from the same donor did yield crystals when bound with the same HA, giving us an independent validation of the cryoEM results The two structures also augment our understanding of receptor-binding site recognition by antibodies that neutralize a wide range of influenza-virus variants.
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