Structural basis for the restoration of TCR recognition of an MHC allelic variant by peptide secondary anchor substitution.

Structural basis for the restoration of TCR recognition of an MHC allelic variant by peptide secondary anchor substitution.
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DOI:
10.1084/jem.20040217
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发表时间:
2004-12-06
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Fremont DH
Fremont DH
中科院分区:
其他
文献类型:
--
作者:
Miley MJ;Messaoudi I;Metzner BM;Wu Y;Nikolich-Zugich J;Fremont DH

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主要组织相容性复合物 (MHC) I 类变体 H-2Kb 和 H-2Kbm8 的主要区别在于肽结合沟的 B 口袋,该口袋用于隔离 P2 二级锚定残基。这种多态性通过调节 T 细胞对免疫显性糖蛋白 B498-505 表位 (HSV8) 的反应来决定对致命性单纯疱疹病毒 (HSV-1) 感染的抵抗力。我们研究了这些效应的分子基础,并证实针对 Kb-HSV8 产生的 T 细胞受体不能识别 H-2Kbm8-HSV8。然而,将 SerP2 替换为 GluP2(肽 H2E)会逆转 T 细胞受体 (TCR) 识别; H-2Kbm8–H2E 被识别,而 H-2Kb–H2E 未被识别。通过确定与结合肽 (pMHC) 复合的所有四种 MHC I 类分子的晶体结构,深入了解了这种区分的结构基础。令人惊讶的是,我们没有发现一致的 pMHC 表面差异可以解释 TCR 识别的差异。然而,识别数据与 B 袋的潜在肽结合沟化学之间存在明显的相关性,表明二级锚定残基可以通过与 pMHC 表面静息态构象的改变不同的机制深刻影响 TCR 结合。
Major histocompatibility complex (MHC) class I variants H-2Kb and H-2Kbm8 differ primarily in the B pocket of the peptide-binding groove, which serves to sequester the P2 secondary anchor residue. This polymorphism determines resistance to lethal herpes simplex virus (HSV-1) infection by modulating T cell responses to the immunodominant glycoprotein B498-505 epitope, HSV8. We studied the molecular basis of these effects and confirmed that T cell receptors raised against Kb–HSV8 cannot recognize H-2Kbm8–HSV8. However, substitution of SerP2 to GluP2 (peptide H2E) reversed T cell receptor (TCR) recognition; H-2Kbm8–H2E was recognized whereas H-2Kb–H2E was not. Insight into the structural basis of this discrimination was obtained by determining the crystal structures of all four MHC class I molecules in complex with bound peptide (pMHCs). Surprisingly, we find no concerted pMHC surface differences that can explain the differential TCR recognition. However, a correlation is apparent between the recognition data and the underlying peptide-binding groove chemistry of the B pocket, revealing that secondary anchor residues can profoundly affect TCR engagement through mechanisms distinct from the alteration of the resting state conformation of the pMHC surface.
主要组织相容性复合肽复合物的构象差异会导致同种异体。
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