用超长CDRH3对19种牛抗体进行分子动力学比较研究
Olena Denysenko1, Anselm H C Horn1,2, Heinrich Sticht1,2
1Bioinformatics, Institute of Biochemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054 Erlangen, Germany.
Antibodies (Basel, Switzerland)
|August 22, 2025
概括
牛产生具有旋域的超长CDRH3段 (ulCAB) 的抗体. 分子动力学模拟显示了溶液中的显著旋和茎的灵活性,挑战了晶体结构的刚性,并突出了序列的多样性
科学领域:
- 免疫学
- 结构生物学
- 计算生物学
背景情况:
- 牛具有具有超长CDRH3段 (ulCABs) 的独特抗体.
- 这些ulCAB具有二硫化物稳定旋域,通过β链茎连接到抗体核心.
- 晶体结构表明硬,延伸的茎形状,但由于晶体包装文物而受到质疑.
研究的目的:
- 研究超长CDRH3段 (ulCAB) 的溶液动力学.
- 为了比较19个独特的ulCAB的结构稳定性和旋域动力学.
- 分析分子内旋相互作用及其对ULCAB结构的影响.
主要方法:
- 针对19个ulCAB系统在明确溶剂中进行了一微秒分子动力学 (MD) 模拟.
- 分析了形状稳定性,旋域动力学和茎的灵活性.
- 进行了分子内旋相互作用的能量分析.
主要成果:
- 在溶液中没有保持延伸的茎形状; 观察到显著的动态.
- 在ULCAB中,旋动态,方向,茎的灵活性和运动频率存在实质性的差异.
- 在大约一半的模拟ULCAB中发现了旋和轻链之间的相互作用.
结论:
- 凸显的旋动态是ULCAB的一般特征,而不是例外.
- 旋运动的程度取决于系统,反映ulCAB CDRH3区域的序列多样性.
- 观察到的旋-LC相互作用可以稳定特定的旋方向,而MD数据可以指导微型抗体的设计.
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