形状的多様性によって媒介される抗体の多種性
Leo C James1, Pietro Roversi, Dan S Tawfik
1Centre for Protein Engineering, Medical Research Council Centre, Hills Road, Cambridge CB2 2HQ, UK.
まとめ
単一の抗体は,結合部位の形を変えて,異なる抗原と相互作用することができます. この形状の多様性は,抗体レパートリーを拡大しますが,自己免疫疾患やアレルギーの発生にも寄与します.
科学分野:
- 免疫学 免疫学とは
- 構造生物学 構造生物学とは
- バイオケミストリー バイオケミストリー
背景:
- 抗体は,特定の抗原を認識し,適応免疫に不可欠です.
- 伝統的な見解では,抗体は単一の,固定された結合部位の適合性を有する.
研究 の 目的:
- 単一の抗体の形状の柔軟性を調査する.
- 形状の変化が抗原結合と抗体機能にどのように影響するかを理解する.
主な方法:
- 抗体構造を決定するためのX線結晶学.
- 結合ダイナミクスを分析するための安定状態前運動学.
- 特定の抗体と抗原の相互作用を特定するためのレパートリー選択.
主要な成果:
- 単一の抗体は,結合部位の形状をはっきりと示し,無関係な抗原に結合することを可能にしました.
- 抗体同位体間の均衡が確認され,1つの同位体が低親和性の乱交的結合を示した.
- 誘発的適合性イソメリゼーションは,深い狭い場所での高親近性結合をもたらしました.
- タンパク質抗原は,幅広く浅い結合部位を持つ異なる抗体同位体を使用した.
結論:
- 抗体構成の多様性は,単一の抗体配列が複数の機能を実行することを可能にします.
- この柔軟性は,抗体レパートリーの有効なサイズを高めます.
- しかし,形状の多様性により,自己免疫性やアレルギーに罹患する傾向もある.
関連する概念動画
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The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
Cross-reactivity
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...
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The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
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The basic structure of an antibody consists of four protein chains: two identical heavy chains and two identical light chains. These chains are held together by disulfide bonds and other non-covalent interactions, forming a Y-shaped structure.
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