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Updated: May 27, 2025

Reverse Genetics Mediated Recovery of Infectious Murine Norovirus

Reverse Genetics Mediated Recovery of Infectious Murine Norovirus

Published on: June 24, 2012

鼠类诺罗病毒所有菌逃生突变体模仿肠道激活

Michael B Sherman, Hong Q Smith, Faith Cox

bioRxiv : the preprint server for biology

|February 20, 2025

概括

鼠诺病毒 (MNV) 囊突变使其能够保持激活状态,避免抗体中和. 这一发现为设计更有效的诺罗病毒疫苗提供了洞察力.

科学领域:

病毒学病毒学
结构生物学结构生物学
免疫学免疫学免疫学

背景情况:

鼠类诺病毒 (MNV) 呈现出其囊体 (VP1蛋白) 的显著构造变化,以应对环境条件.
囊体的突出的 (P) 域从中性条件下的松散绑定状态转变为模拟肠道条件下的激活状态,增强受体结合和阻断抗体.

研究的目的:

通过确定两个逃生突变 (V339I和D348E) 的冷电子显微镜 (cryo-EM) 结构来研究诺罗病毒免疫逃避的结构基础.
了解体结构变化背后的全体机制及其对抗体中和的影响.

主要方法:

在中性pH下确定MNV逃生突变V339I和D348E的冷-EM结构,有或没有金属离子和胆汁盐.
执行了MNV P域的动态模拟,以分析形状灵活性和过渡动态.

主要成果:

V339I和D348E突变体在活性体状态中,即使没有金属离子或胆汁盐等环境触发物.
动态模拟表明,CD循环运动对于形状转变至关重要,V339I突变通过增加循环运动来促进这种转变.

结论:

MNV的异种脱离突变体被锁定在一个激活的构造中,这解释了它们对中和的抵抗力.
了解这些构造动态是开发诺罗病毒疫苗的关键,这些疫苗可以引起对野生类型菌株的广泛保护性免疫力.

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Plaque Assay for Murine Norovirus

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Published on: August 22, 2012

Quantifying Human Norovirus Virus-like Particles Binding to Commensal Bacteria Using Flow Cytometry

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