高親和性相互作用のための構造再折り畳みを誘導する抗PD-1抗体の計算進化
Yuanjun Shi1, Yeil Kim2, Pulan Liu3
1Department of Chemistry, Yale University, New Haven, Connecticut 06511, United States.
Biochemistry
|February 11, 2026
まとめ
計算手法により、柔軟なPD-1タンパク質を標的とする新しい抗体が進化しました。変異体であるm7p.5はピコモル親和性を達成し、タンパク質間相互作用療法のための新しいツールを提供します。
科学分野:
- 免疫学
- 計算生物学
- 構造生物学
背景:
- PD-1/PD-L1軸を標的とするチェックポイント阻害剤は、重要な免疫療法です。
- PD-1の動的で柔軟な性質は、抗体工学に課題をもたらします。
研究 の 目的:
- 計算アプローチを使用してPD-1に対する結合親和性を強化したペンブロリズマブ変異体を進化させること。
- 柔軟なタンパク質インターフェースを標的とするための統合計算方法の有用性を示すこと。
主な方法:
- 計算飽和変異誘発
- AlphaFold予測
- 分子動力学(MD)シミュレーション
- 抗体-タンパク質構造相互作用の分析
主要な成果:
- 7つの工学抗体が、追加の塩橋と疎水性接触を通じて結合能の改善を示しました。
- 1つの変異体、m7p.5は、二相性運動学と高親和性結合(KD,apparent = 62 pM)を示しました。
- 観察された構造変化には、抗体重鎖のαヘリックスからループへの遷移と、PD-1ループの顕著なシフトが含まれていました。
結論:
- 計算進化は、従来の設計の限界を克服し、本質的に柔軟な標的のための高親和性抗体を生成できます。
- MDシミュレーションを含む統合計算アプローチは、新規ピコモル親和性抗体の発見のための費用効果の高い方法を提供します。
- この研究は、PD-1およびその他のタンパク質間相互作用に対するAI駆動型抗体生成のための貴重なツールを提供します。
関連する概念動画
Antibody Structure
65.7K
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...
65.7K
Affinity and Avidity
39.2K
Overview
39.2K
The Evidence for Evolution
48.4K
Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
48.4K
Antibody Structure and Classes
9.4K
Antibodies, also known as immunoglobulins, are produced by B cells in response to foreign substances, such as bacteria and viruses. These proteins are critical for recognizing and neutralizing these substances, protecting the body from potential harm.
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.
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.
9.4K
Convergent Evolution
33.1K
Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
33.1K
Electron Affinity
43.7K
The electron affinity (EA) is the energy change for adding an electron to a gaseous atom to form an anion (negative ion).
43.7K


