まとめ
研究者らは,T細胞受容体アルファ鎖のcDNAクローンを特定し,その構造と遺伝子再編成を明らかにした. この発見は,T細胞の認識と免疫グロブリンとの関連に関する理解を深める.
科学分野:
- 免疫学 免疫学とは
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- T細胞受容体 (TCR) は,メジャー・ヒストコンパティビリティ・コンプレックス (MHC) 限定抗原認識を媒介する.
- TCRは,構造的には免疫グロブリンに類似した,ディスルフィード結合アルファおよびベータグリコペプチドで構成されています.
研究 の 目的:
- 人間のT細胞受容体のアルファ鎖をコードするcDNAクローンを識別する.
- TCR媒介抗原認識の分子基礎を調査する.
主な方法:
- ヒトとネズミのT細胞クローンからTCRを分離し,特徴づけるために,抗TCRモノクローナル抗体を利用した.
- TCRアルファ鎖の遺伝子発現と再配列を分析するために,cDNAプローブを含む分子クローン技術を使用した.
主要な成果:
- HPB-MLT細胞系からヒトT細胞受容体のアルファ鎖をコードする単離および特徴づけられたcDNAクローン.
- アルファ鎖mRNA発現とV遺伝子セグメントの再編成は,T細胞においてのみ発生することを実証した.
- アルファ鎖の予測されたタンパク質配列は,特に変数 (V) と結合 (J) セグメントにおいて,TCRベータ鎖と免疫グロブリン鎖とのホモロジーを示している.
結論:
- T細胞受容体のアルファ鎖は,免疫グロブリン鎖と進化的,構造的に類似している.
- V遺伝子セグメントの遺伝子再編成は,T細胞における機能的なT細胞受容体アルファ鎖発現に不可欠である.
- これらの発見は,T細胞の認識と免疫反応の基礎となる分子機構の理解に貢献します.
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関連する概念動画
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...
