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整合多种MS技术进行深入抗体糖化分析:揭示糖化依赖的结构和功能性质
Yuye Zhou1,2, Sophia Schedin Weiss3, Congrui Tan1
1Department of Chemistry and Applied Biosciences, ETH Zurich, CH-8093 Zürich, Switzerland.
Analytical chemistry
|September 11, 2025
概括
在COVID-19患者中改变蛋白质糖化影响免疫细胞结合和蛋白质稳定性. 我们的综合质谱 (MS) 平台揭示了这些甘氨酸变化及其功能后果.
科学领域:
- 生物化学 生物化学
- 免疫学 免疫学 免疫学
- 分析化学 分析化学
背景情况:
- 糖基化显著影响蛋白质的结构,稳定性和功能.
- 为了系统地描述糖基化效应的综合工具是有限的.
- 了解糖化在疾病中的作用对于治疗的发展至关重要.
研究的目的:
- 开发和应用一个集成的质谱 (MS) 平台,用于全面分析依赖于糖化酶的蛋白质变化.
- 为了研究COVID-19患者改变糖基化对人类IgG Fc结构和功能的影响.
- 为了将特定的糖甘变化与蛋白质构成,稳定性和受体结合的变化相关联.
主要方法:
- 多种MS技术的整合:高分辨率纳米电子喷雾电离MS (nESI-MS),交联MALDI-TOFMS (XL-MALDI-MS),本地MS,离子移动MS (IM-MS).
- 使用碰撞诱导的展开和温度控制的nESI源进行详细的结构和稳定性分析.
- 将平台应用于来自住院COVID-19患者和健康对照组的人类IgG Fc.
主要成果:
- 在COVID-19患者的IgG Fc糖化中发现了显著的变化,包括核心化,银河糖化和化损失.
- 观察到afucosylation与增强的FcγRIIIa结合相关.
- 发现糖化变化与更开放的Fc构造和减少蛋白质稳定性有关.
结论:
- 糖化是免疫失调的关键因素,在严重的COVID-19中观察到.
- 集成的MS平台有效地揭示了甘氨酸变化的结构和功能后果.
- 这个平台对糖蛋白分析,糖基工程质量控制和传染病研究具有广泛的应用.
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