抗体/MHC-I复合体的实验结构揭示了计算预测忽视的表位的细节
Lisa F Boyd1, Jiansheng Jiang1, Javeed Ahmad1
1Molecular Biology Section, Laboratory of Immune System Biology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda MD, 20892-1892.
bioRxiv : the preprint server for biology
|December 18, 2023
概括
对与/MHC-I结合的单克隆抗体 (mAbs) 的结构研究揭示了特定的结合部位. 计算模型虽然预测了异构体,但未能准确地识别MHC-I分子上的抗体对接点.
科学领域:
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
- 计算生物学 计算生物学
背景情况:
- 针对主要基因相容性复合体I类 (MHC-I) 的单克隆抗体 (mAbs) 对组织类型和理解免疫识别至关重要.
- 阐明这些mAbs在MHC-I上的精确结合点 (表位) 对推动免疫学研究至关重要.
研究的目的:
- 阐明各种抗MHC-I mAbs在/MHC-I (pMHC-I) 综合体上的精确结合点.
- 将实验确定结构与计算生成的模型进行比较,以预测mAb-pMHC-I相互作用的准确性.
主要方法:
- 采用X射线晶体学来确定与pMHC-I复合的四个抗MHC-I抗体碎片 (Fab) 的结构.
- 使用AlphaFold Multimer (AF-M) 的计算建模用于预测pMHC-I结构和mAb对接站点.
主要成果:
- 实验结构证实了抗H2-Dd,抗MHC-I α3域和抗β2-微球蛋白mAbs的特定结合点,解释了等位基特异性.
- 虽然AF-M准确地预测了pMHC-I异构体结构,但它未能正确识别pMHC-I复合体上的mAbs的对接点.
结论:
- 实验结构为mAb-pMHC-I相互作用提供了宝贵的见解.
- 突出了当前纯计算方法预测抗体-表位相互作用的局限性.
- 建议对抗体-抗原复合体预测的计算建模进行改进.
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