3つの同質のタンパク質複合体の深層変異スキャニングを通じて,上下結合する風景を登る
Michael Heyne1,2, Jason Shirian1, Itay Cohen2
1Department of Biological Chemistry, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, 9190401, Israel.
Journal of the American Chemical Society
|October 5, 2021
まとめ
研究者は高度な方法を使用して,タンパク質とタンパク質の相互作用 (PPI) をマッピングしました. これらの相互作用の進化の経路が 結合特性や変異効果を 大きく左右することを発見しました
科学分野:
- 生物化学
- 構造生物学
- 進化生物学
背景:
- タンパク質とタンパク質の相互作用 (PPI) は細胞機能にとって極めて重要です.
- PPIは,構造的に類似したペアでも,幅広い結合親和性を表しています.
- 結合親和性の進化を理解することは,PPIメカニズムを解読する鍵です.
研究 の 目的:
- PPIの構造,結合親和性,進化史との関係を調査する.
- ホモログのプロテアゼ阻害剤PPIの結合パターンを定量的にマッピングする.
- 進化の最適性が結合に及ぼす変異効果を特定する.
主な方法:
- タンパク質のランダム化と親密な分類で ミュータントライブラリを生成する
- 何千もの変異の結合親和性を定量化するための ディープシーケンシング
- 結合自由エネルギー変化 (ΔΔGbind) を単一および二重変異体で計算する.
- 変異結合とエピスタシスのパターンの分析
主要な成果:
- 3つの同類のプロテアゼ阻害剤PPIの定量結合パターンが生成され,結合親和度は9桁の大きさであった.
- 各PPIの進化的最適度と相関する重要な違いを示した.
- 異変結合 (エピスタシス) の明確なパターンが観察され,ホットスポットでのネガティブなエピスタシスと,冷たいスポットでのポジティブなエピスタシスが観察されました.
結論:
- PPIの進化の軌道は,その結合パターンや変異感受性に大きな影響を及ぼします.
- エピスタシスのパターンは,PPI内の特定のアミノ酸の機能的重要性に関連しています.
- 観察されたPPIの進化傾向は,他の生物学的分子複合体に適用できる一般的原理を表す可能性があります.
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