阐明mWT1瘤相关抗原和HLA-A*24:02之间的结合机制,亲和力和复杂结构
Gert-Jan Bekker1, Nobutaka Numoto2, Maki Kawasaki3
1Institute for Protein Research, Osaka University, Suita, Osaka, Japan.
Protein science : a publication of the Protein Society
|September 4, 2023
概括
我们使用先进的模拟来揭示一种修改后的威尔姆斯瘤1 (mWT1) 酸如何与HLA-A24分子结合. 结合涉及最初的相互作用与一个关闭的主要基因相容性复合体 (MHC) 形状,随后是开放的稳定复合体形成.
科学领域:
- 免疫学 免疫学 免疫学
- 计算生物学 计算生物学
- 结构生物学 结构生物学
背景情况:
- 威尔姆斯瘤1 (WT1) 蛋白在癌症中起作用,其修饰后的表位 (mWT1) 是免疫治疗的点.
- 人类白细胞抗原HLA-A*24:02 (HLA-A24) 是亚洲人群中普遍存在的一种主要基因相容性复合体 (MHC) 分子,对于向T细胞呈现抗原至关重要.
- 了解mWT1表位素与HLA-A24的结合对于开发有效的癌症疫苗和免疫疗法至关重要.
研究的目的:
- 通过HLA-A24分子,研究一种经过修改的威尔姆斯瘤1 (mWT1) 的详细结合机制和结构动态.
- 通过将模拟结果与实验性X射线晶体结构进行比较来验证计算发现.
- 阐明控制-MHC结合的原子级相互作用,并确定影响结合亲和力的关键因素.
主要方法:
- 利用基于多规范分子动力学 (McMD) 的动态对接来进行途径和机制分析.
- 采用路径采样分子动力学 (MD) 模拟来捕获结合过程的原子细节.
- 通过与实验确定的X射线晶体结构进行比较,验证了模拟结果.
主要成果:
- 确定了由mWT1的N端和HLA-A24表面之间的静电相互作用所驱动的初始遭遇复杂形成.
- 观察到主要基因相容性复合体 (MHC) 分子更喜欢初始结合的闭合构造.
- 证明结合部位以热带方式开放,允许稳定的本地复合物形成.
- 序列和结构分析表明,固有的-MHC亲和力是结合稳定性的主要决定因素.
结论:
- mWT1与HLA-A24的结合是一个多步骤的过程,涉及MHC分子的初始静电相互作用和结构变化.
- 计算工具,包括McMD和路径采样MD,对于研究-MHC结合机制是有效的.
- 这些发现可以为更好的癌症免疫疗法和个性化医学方法提供更高亲和度的设计信息.
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