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对1型脊髓灰质炎稳定病毒样颗粒的组合和D抗原性的结构洞察

Qin Hong¹, Tian Chen², Wenyu Han^3,4

¹Key Laboratory of RNA Science and Engineering, Shanghai Institute of Biochemistry and Cell Biology, Center for Excellence in Molecular Cell Science, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai, China.

|February 24, 2026

概括

类似于脊髓灰质炎病毒的工程颗粒 (VLPs) 显示了增强的热稳定性,保持了下一代疫苗的免疫性. 这一突破为稳定的肠道病毒疫苗和质量控制试剂提供了一条道路.

科学领域:

病毒学病毒学
结构生物学结构生物学
疫苗开发疫苗开发

背景情况:

脊髓灰质炎病毒囊的不稳定性给开发有效的根除后疫苗带来了挑战.
野生型病毒样颗粒 (VLP) 呈现不稳定性,失去免疫性.
为了克服这些局限性,正在探索一种热稳定型VLP (sVLP) 方法.

研究的目的:

为了设计和结构性地描述一个热稳定型脊髓灰质炎病毒VLP (sVLP).
评估与野生型VLP (wtVLP) 相比,工程化sVLP的免疫性.
阐明sVLP稳定和D抗原识别的结构基础.

主要方法:

一种热稳定型脊髓灰质炎病毒血清型1 (PV1) 马霍尼-SC7突变sVLP的工程.
在Pichia pastoris酵母中生产sVLP.
电子显微镜 (cryo-EM) 用于在2.43 Å和2.60 Å分辨率下进行结构确定.
用小鼠进行免疫研究,以评估中和抗体反应.

主要成果:

在Pichia pastoris.中生产高产的sVLP.
设计的sVLP保持了原生D-抗原构造,并引起了小鼠的强烈中和抗体反应.
冷-电磁结构揭示了七种稳定突变,增强了质体间接触和硬化表面环.
确定了sVLP与D抗原特异性中和单克隆抗体 (3G10) 复合的结构,阐明了抗原识别机制.

结论:

设计的sVLP为脊髓灰质炎病毒疫苗提供了一个稳定且具有免疫性的平台.
这些结构性见解为开发针对脊髓灰质炎病毒和其他肠道病毒的稳定疫苗提供了蓝图.
该sVLP作为一个有价值的试剂用于疫苗质量控制.

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