在T细胞激活蛋白表面的V-域免疫球蛋白抑制剂上绘制结合热点和短暂的结合口袋
Bingjie Li1, Lixiu Xu1, Chu Chen1
1School of Pharmacy, Inflammation and Immune Mediated Diseases Laboratory of Anhui Province, Anhui Medical University, Hefei 230032, China.
ACS omega
|December 16, 2024
概括
确定V-域免疫球蛋白抑制T细胞激活 (VISTA) 的关键相互作用点对于开发新的癌症疗法至关重要. 这项研究绘制了VISTA/VSIG-3热点地图,揭示了新型免疫检查点抑制剂的潜在目标.
科学领域:
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
- 计算化学计算化学
背景情况:
- 维域免疫球蛋白抑制T细胞激活 (VISTA) 是免疫和瘤细胞的免疫检查点,显示癌症治疗的前景.
- VSIG-3作为VISTA的抑制性联体,抑制T细胞的增殖.
- 由于缺乏复杂的结构数据,VISTA和VSIG-3之间的精确交互地点 (热点) 尚未确定.
研究的目的:
- 确定和描述VISTA/VSIG-3蛋白质与蛋白质相互作用中的界面残留物的能量贡献.
- 为了绘制VISTA热点的地图,参与绑定VSIG-3.
- 探索VISTA/VSIG-3综合体内潜在的可用药物口袋,以进行治疗开发.
主要方法:
- 蛋白质对接被用来构建VISTA/VSIG-3复杂模型.
- 进行了分子动力学模拟来分析复杂的.
- 结合性自由能量分解和氨酸扫描被用来识别关键残留物.
- 使用TRAPP工具来识别暂时的子口袋.
主要成果:
- 假设的VISTA热点包括His32,Tyr37,Thr35,Glu47,Val48,Gln49,Glu53,Arg54,Gln73,His122和His126.这些残留物.
- 这些热点被分为两个不同的区域 (热点区域I和II).
- 在这些热区域内确定了短暂的子口袋,其中一些表现出比在晶体结构中观察到的更高的可药性.
结论:
- 这项研究成功地确定了对VISTA/VSIG-3相互作用有贡献的关键残留物和区域.
- 这些发现为理解VISTA/VSIG-3绑定提供了结构和能量基础.
- 已确定的热点和可用药的口袋为开发用于癌症免疫治疗的新型VISTA/VSIG-3抑制剂提供了有希望的目标.
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