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在AD样本中对蛋白N-糖化酶的综合性和特异性特征化揭示了其在蛋白质聚合和突触功能障碍中的潜在作用

Xing Xu¹, Haiyan Tan², Kejun Yin¹

¹School of Chemistry and Biochemistry and the Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

Analytical chemistry

|October 3, 2025

概括

蛋白N-糖化变化与阿尔茨海默氏症 (AD) 病原发生有关. 在AD大脑中减少的糖化损害了突触功能,促进了蛋白质聚合,这表明N-糖化作为治疗点.

科学领域:

神经科学是一个神经科学.
生物化学生物化学
蛋白质组学是指蛋白质组学.

背景情况:

阿尔茨海默病 (AD) 是一种神经退行性疾病,其特征是认知能力下降.
蛋白质糖化被越来越多地认为是AD的一个因素.
在AD中特定于位点的N-糖化变化需要进一步调查.

研究的目的:

系统地分析人类AD脑组织中特定部位的N-糖化变化.
为了研究AD病变发生过程中这些糖化变化的功能后果.

主要方法:

采用了基于树突分子酸 (DBA) 的丰富策略.
采用多重蛋白质组学来对N-糖基化进行系统分析.
分析了阿尔茨海默病例和健康对照患者的死后人类大脑组织.

主要成果:

在1,299个糖蛋白上确定了3,105个N-糖化位点.
在AD中发现胆固醇外流糖蛋白的上调和突触传输/离子运输糖蛋白的下调.
观察到广泛的N-糖基化失调,特别是在ConA类的莱克/葡萄糖酶和Zn依赖的外酶领域.
在容易聚合的区域 (APR) 中确定了161个N-糖化位点,其中减少的糖化可能与斑块形成有关.
在突触蛋白,包括离子通道和受体中发现了下调的N-糖化位点的丰富,这表明在突触功能障碍中发挥了作用.

结论:

损失N-糖基化有助于AD的发病因子通过损害突触传输和促进蛋白质聚合.
提供了对依赖于糖化酶的神经退行机制的新见解.
突出了N-甘化作为阿尔茨海默病的潜在治疗点.

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