促进蛋白质-多电解质相互作用的HMGB1B盒域协同物
Marten Kagelmacher1,2, Marina Pigaleva1, Ricardo Zarate1
1Institute of Chemistry and Biochemistry, Freie Universität Berlin, 14195 Berlin, Germany.
The journal of physical chemistry. B
|September 6, 2025
概括
高移动性组盒1 (HMGB1) 蛋白的自我结合,特别是通过其B盒域,增强了肝素的结合. 这种多元化会产生充电区域,改善与肝素等多离子的相互作用,这对免疫调节至关重要.
科学领域:
- 生物化学
- 分子生物学
- 免疫学
背景情况:
- 高流动性组盒1 (HMGB1) 是一个作为细胞外警报剂的核蛋白.
- HMGB1信号可以驱动炎症,这种炎症由聚离子结合调节.
- HMGB1经历了与其功能相关的相分离,可能涉及其B盒域.
研究的目的:
- 研究HMGB1B盒域在蛋白质自我结合中的作用.
- 确定HMGB1自我关联如何影响其与肝素的相互作用.
- 阐明 HMGB1- 肝素相互作用的结构机制.
主要方法:
- 对HMGB1B盒域的蛋白自我关联分析.
- 电子磁共振 (EPR) 光谱用于研究蛋白质 - 肝素相互作用.
- 预测结构变化和电荷分布.
主要成果:
- HMGB1 B-盒域形成稳定的30nm自我关联.
- 与单个链相比,蛋白质关联物显著增强肝素结合.
- 阿尔法模型显示,多元化会产生扩展的正电荷区域,增强聚离子的结合.
结论:
- 通过B盒域介导的HMGB1自我关联对于增强的肝素结合至关重要.
- 多元化诱导的电荷再分配解释了对像氨酸这样的多离子的增强亲和力.
- 这些发现为HMGB1在免疫调节和相分离中的作用提供了结构性见解.
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