3(10) -ヘリクスのモデルとして,ラクタム・ブリッジされたサイドチェーンを含むAib豊富なペプチド
E Schievano1, A Bisello, M Chorev
1University of Padova, Department of Organic Chemistry, Biopolymer Research Center, C.N.R, Via Marzolo 1, 35131 Padua, Italy.
Journal of the American Chemical Society
|July 18, 2001
まとめ
アルファ-アミノイオバター酸 (Aib) に富んだラクタムブリッジされたオリゴーマーが合成され,3(10) -ヘリックスがモデル化されました. これらのAibに富んだペプチドは,鎖の延長とともに3・10・ヘリックス形成の増加を示し,NMRとシミュレーションによって確認されています.
科学分野:
- ペプチド化学 ペプチド化学
- 構造生物学 構造生物学とは
- 生物物理化学 生物物理化学
背景:
- 3(10) - ヘリクスは,タンパク質における一般的な二次構造モチーフです.
- 特定の螺旋状構造を採用するペプチドの設計は,タンパク質の折り畳みを理解し,ペプチドベースの治療法を開発するために不可欠です.
- アルファ-アミノイオブータリック酸 (Aib) 残基は,螺旋形状を促進することが知られている.
研究 の 目的:
- 3(10) -ヘリクスのモデルとして,新しいラクタムブリッジされたオリゴマーの設計と合成を行う.
- 溶液中のこれらのペプチドの構造的好みを調査する.
- 鎖の延長が3(10) - ヘリックス形成に及ぼす影響を調査する.
主な方法:
- Aibが豊富で,サイドチェーン・ラクタム・ブリッジ・オリゴマーの合成 (n=1, 2, 3).
- 水性SDSミセルにおける円形二重化 (CD) と核磁気共鳴 (NMR) スペクトロスコーピーを用いた適合性特徴付け.
- 分子ダイナミクスシミュレーションとNOE (Nuclear Overhauser Effect) の接続性分析を含む計算分析.
主要な成果:
- NMRデータは,オリゴーマー (ダイマーとトリマー) の長さの増加とともに,3~10-ヘリックス形成の増加を示しています.
- NOEの接続性とアミド陽子の温度係数は,安定した,水素結合の螺旋構造をサポートします.
- 分子ダイナミクスのシミュレーションと水素結合の分析は,C=O(i) - - -HN(i+3) 相互作用が3(10) -ヘリクスの特徴であることを確認しています.
- CDスペクトルは,これらのペプチドの3(10) - ヘリル形状のスペクトロスコピクシグネチャーを提供します.
結論:
- Aib豊富なオリゴーマーにおけるサイドチェーン・ラクタム・ブリッジングは,3(10) -ヘリックスに対する構造的好みを効果的に高めます.
- 鎖の延長は,安定した3・10・螺旋構造の形成を著しく促進する.
- これらのモデルペプチドは,3(10) -ヘリクスのスペクトル学的および構造的特性に関する貴重な洞察を提供します.
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