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The Equilibrium Binding Constant and Binding Strength02:18

The Equilibrium Binding Constant and Binding Strength

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The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:
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A TIRF Microscopy Technique for Real-time, Simultaneous Imaging of the TCR and its Associated Signaling Proteins
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在TCR:pMHC-I结合接口中量化构造变化.

Benjamin McMaster1,2, Christopher J Thorpe3,4, Jamie Rossjohn5,6

  • 1Koohy Lab, Medical Research Council Translational Immune Discovery Unit (MRC TIDU), Weatherall Institute of Molecular Medicine (WIMM), Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom.

Frontiers in immunology
|December 17, 2024
PubMed
概括
此摘要是机器生成的。

与-MHC I类 (pMHC-I) 的T细胞抗原受体 (TCR) 相互作用涉及结构变化,特别是在CDR3循环中,影响T细胞识别和抗原特异性建模.

关键词:
哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈在MHC中,MHC是MHC.T细胞抗原特异性T细胞抗原特异性在TCR中,可以使用TCR.形状的变化 形状的变化这是一种类.结构生物学结构生物学

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Using X-ray Crystallography, Biophysics, and Functional Assays to Determine the Mechanisms Governing T-cell Receptor Recognition of Cancer Antigens
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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:

  • T细胞对于适应性免疫至关重要,通过与-MHC (pMHC) 分子相互作用的T细胞受体 (TCR) 识别抗原.
  • TCR:pMHC接口的结构动态对于T细胞激活至关重要,但仍然不完全理解.
  • 之前对TCR:pMHC-I相互作用的研究给出了关于接口形状变化的混合结果,缺乏广泛的统计验证.

研究的目的:

  • 量化分析TCR:pMHC-I结合接口中的构造变化.
  • 阐明在结合时经历构造变化的TCR和pMHC-I的特定区域.
  • 为了解T细胞抗原特异性建立结构基础.

主要方法:

  • 编制了391个结构的数据集,包括22个TCR,19个MHC等位基因和79个无结合 (apo) 和结合 (holo) 状态的.
  • 分析结构数据以量化TCR:pMHC-I复合体中的构造变化.
  • 绘制了分子间接触的地图,以确定关键的结合接口和相互作用模式.

主要成果:

  • 所有互补性决定区域 (CDR) 循环都表现出一些运动;在pMHC-I结合时,CDR3α和CDR3β循环显著改变其形状.
  • 创建了一个新的TCR:pMHC-I相互作用指纹,显示CDR3α与N端结合,CDR3β与C端结合.
  • 形变化发生在TCR参与时,其程度取决于在MHC结合内固定.

结论:

  • TCR:pMHC-I结合涉及CDR循环和的动态形状变化,这对于T细胞识别至关重要.
  • 这些发现提供了对T细胞抗原特异性机制的见解.
  • 这项工作有助于开发用于预测T细胞抗原特异性的计算模型,解决免疫学的一个主要挑战.