アルファキラル,アロマティックサイドチェーンを持つペプトイドオリゴーマー: 鎖の長さの二次構造への影響
C W Wu1, T J Sanborn, R N Zuckermann
1Department of Chemical Engineering, Northwestern University, Evanston, Illinois 60208, USA.
Journal of the American Chemical Society
|July 18, 2001
まとめ
チラルペプトイド (N置換グリシン) オリゴーマーが安定したヘリクスを形成します. 螺旋状の構造と二次的形状は鎖の長さに左右され,安定した螺旋状は13個の残留物を形成する.
科学分野:
- 超分子化学 超分子化学
- 有機化学 オーガニック・ケミストリー
- バイオマテリアル科学 バイオマテリアル科学
背景:
- N置換のグリシン (ペプトイド) は,脊髄キラリティや水素結合なしに安定したヘリクスを形成することができます.
- 螺旋の安定性は,ステリック回避と静電抵抗の影響を受けます.
- ペプチドヘリクスは,ペプチドアルファヘリクスのような明確な円形二重化 (CD) のスペクトルを示しています.
研究 の 目的:
- オリゴマーの長さ,濃度,および温度が,有機溶性ペプトイドホモオリゴマーのキラル二次構造に与える影響を調査する.
- 安定したペプトイドヘリックス形成に必要な最小鎖の長さを決定する.
- 溶液中のこれらのペプトイドヘリクスの集積行動を評価する.
主な方法:
- サーキュラー・ディクロイズム (CD) スペクトロスコーピーを用いた体系的な研究.
- (R) -N-(1-フェニルエチル) グリシン (Nrpe) オリゴマーの合成と分析,長さは3から20モノマー.
- 構造変化を観察するためにオリゴマーの濃度と温度を変化させる.
主要な成果:
- Nrpeオリゴーマーで4~12残留の間でCDスペクトル特性の有意な進化が観察されました.
- このスペクトル変化は,シス/トランスアミド結合を持つ,鎖長に依存するコンフォマー群に起因する.
- 安定したポリ (Nrpe) ヘリクには,約13個の残留物の最小鎖長が必要です.
- Nrpeヘクサマーは,濃度に依存するCD変化を示せず,溶液中のモノメリック行動を示した.
結論:
- ペプトイドヘリックス形成と安定性は,オリゴーマー鎖の長さに極めて依存しています.
- 観測されたCDスペクトルの変化は,アミド結合構成に関連する二次構造の移行を反映しています.
- これらの発見は,安定した螺旋構造を持つバイオミメティックペプトイドの設計に不可欠です.
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