概括
研究人员确定了T细胞受体α链的cDNA克隆,揭示了它的结构和基因重排. 这一发现促进了对T细胞识别及其与免疫球蛋白的联系的理解.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- T细胞受体 (TCR) 调解主要基因相容性复合体 (MHC) 限制的抗原识别.
- TCRs由二硫化物结合的α和β糖组成,其结构类似于免疫球蛋白.
研究的目的:
- 为了识别编码人类T细胞受体α链的cDNA克隆.
- 研究TCR介导的抗原识别的分子基础.
主要方法:
- 利用抗TCR单克隆抗体,从人类和小鼠T细胞克隆中分离和表征TCRs.
- 采用分子克隆技术,包括cDNA探针,分析TCRαα链基因表达和重组.
主要成果:
- 从HPB-MLT细胞系中分离和特征化编码人类T细胞受体α链的cDNA克隆.
- 证明α链mRNA表达和V基因段重组仅在T细胞中发生.
- 阿尔法链的预测蛋白序列与TCRβ链和免疫球蛋白链具有同质性,特别是在变量 (V) 和连接 (J) 段.
结论:
- T细胞受体的α链与免疫球蛋白链具有进化和结构的相似之处.
- 对V基因段的基因重组对于T细胞中的功能T细胞受体α链表达至关重要.
- 这些发现有助于理解T细胞识别和免疫反应背后的分子机制.
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相关概念视频
Protein Organization
Overview
Protein Organization
Overview
Antibody Structure
Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
Protein Organization
Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.
The primary structure of a protein is its amino acid sequence.
Protein Organization
Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.
The primary structure of a protein is its amino acid sequence.
Diversity of Antigen Receptors
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...
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...
