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相关概念视频

T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
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Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

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Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
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相关实验视频

Updated: Jun 29, 2025

Non-Viral Engineering of Primary Human T Cells via Homology-Mediated End-Joining Targeted Integration of Large DNA Templates
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通过框架工程来增强T细胞受体特异性.

Aaron M Rosenberg1, Cory M Ayres1, Angélica V Medina-Cucurella2

  • 1Department of Chemistry and Biochemistry and the Harper Cancer Research Institute, University of Notre Dame, Notre Dame, IN, United States.

Frontiers in immunology
|March 28, 2024
PubMed
概括
此摘要是机器生成的。

工程T细胞受体 (TCRs) 用于免疫疗法是具有挑战性的,因为交叉反应. 这项研究发现,框架突变,而不是结合部位,可以通过控制循环运动来增强TCR特异性,从而提供一种新的治疗策略.

关键词:
T细胞受体受体的 T 细胞受体.框架区域 框架区域 区域 框架区域分子动力学分子动力学蛋白质工程工程 蛋白质工程特殊性的特异性

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科学领域:

  • 免疫学 免疫学 免疫学
  • 蛋白质工程是指蛋白质工程.
  • 计算生物学 计算生物学

背景情况:

  • T细胞受体 (TCRs) 对于适应性免疫至关重要,但它们固有的交叉反应性阻碍了作为免疫治疗药物的发展.
  • 提高TCR特异性是很困难的;与抗体不同,增强的亲和力不能保证更好的特异性.
  • 对于TCRs,现有的蛋白质设计策略可能会产生意想不到的后果,例如扩大特异性或新的反应性.

研究的目的:

  • 调查TCR特异性是否可以通过远离绑定接口的框架区域的突变来调节.
  • 探索一种替代方法来增强超越传统接口工程的TCR特异性.

主要方法:

  • 在868 TCR上使用了深度突变扫描,该扫描识别了由HLA-A2.2呈现的HIV SL9表位.
  • 引入了框架和接口突变,并分析了它们对结合亲和力,功能狂热度和对表位变异的特异性的影响.
  • 用分子模拟来理解特异性调制的机制.

主要成果:

  • 在CDR3β循环上方的一个框架突变 (Glycine to Proline) 增强了TCR特异性,但没有改变目标SL9表位的亲和力或功能性.
  • 这种框架突变削弱了SL9逃生变体的识别,并减少了定位扫描库中的响应.
  • 相比之下,CDR3α尖端附近的界面突变具有相似的亲和力/贪性,特异性降低.
  • 模拟表明增强特异性的突变限制了TCR循环运动,限制了连接体适应.

结论:

  • 通过控制TCR循环动态,框架工程提出了一个潜在的策略,以提高基于TCR的免疫疗法的特异性.
  • 这种方法可以克服以接口为重点的工程的局限性,并为开发更安全,更有效的TCR疗法提供可行的途径.
  • 结果突出了全效应对TCR功能和特异性的重要性.