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在类风湿性关节炎中,具有多个翻译后修饰的皮质上部位的结构研究
María José Gómara1, Cristina García-Moreno1, Oriol Bárcenas2,3
1Unit of Synthesis and Biomedical Applications of Peptides, IQAC-CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain.
International journal of molecular sciences
|September 27, 2025
概括
类风湿性关节炎 (RA) 中的翻译后修饰 (PTM) 改变了它们的结构和自身抗体识别. 不同的PTM,如素,影响结合,解释了RA患者的自身抗体反应.
科学领域:
- 生物化学 生物化学
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
背景情况:
- 对后翻译修改 (PTMs) 如何影响蛋白质结构和抗原识别的理解有限.
- 类风湿性关节炎 (RA) 与向素的自身抗体有关.
研究的目的:
- 研究与RA相关的PTMs对α-纤维素 (617-631) 的构造和自身抗体识别的影响.
- 为了将PTMs诱导的结构变化与RA患者的自身抗体结合模式相关联.
主要方法:
- 合成十个的不同数量和类型的PTMs (氨酸,同氨酸,乙-氨酸).
- 分析RA患者血清对的识别.
- 使用循环二元论 (CD) 的形态分析.
- 通过核磁共振 (NMR) 和增强采样分子动力学 (MD) 模拟进行结构确定.
主要成果:
- 与含有甲素和/或乙-素的相比,与抗改蛋白抗体 (AMPA) 的结合率更高.
- 结合模式因PTM类型及其在序列中的位置而异.
- 在Lys620-Arg630区域中,CD和NMR表明了半转形状.
- MD模拟显示,PTMs通过改变分子内相互作用和键来诱导更多的崩形状.
- 带有PTM的体与未经修改的体采用了不同的构造,这可能是由于降低了净电荷.
结论:
- PTMs显著影响α-纤维素抗原的构造.
- 由PTMs引起的结构变化会影响RA中的自身抗体识别.
- PTMs的特定类型和位置决定了形状变化和随后的自身抗体结合,为RA病原体提供了洞察力.
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