プロリン残基のシス・トランス・イソメリゼーションは,ブラジキニンの形状の鍵です
Nicholas A Pierson1, Liuxi Chen, David H Russell
1Department of Chemistry, Indiana University, Bloomington, Indiana 47405, USA.
Journal of the American Chemical Society
|February 5, 2013
まとめ
ブラジキニン (BK) のプロリン残基は,その構成群を決定する. アラニン置換は,シス・トランス・プロリン構成がペプチド構造と溶液中の相互変換にどのように影響するかを明らかにします.
科学分野:
- 化学物理 化学物理
- 生物物理化学 生物物理化学
- マススペクトロメトリーによる質量スペクトロメトリーです.
背景:
- ノンアペプチドのブラジキニン (BK) は,溶液の組成に依存する複数の形状を示す.
- これらの形状を理解することは,ペプチドの行動と機能を明らかにするために非常に重要です.
研究 の 目的:
- BKの形状の多様性を確立するプロリン残留物の特定の役割を調査する.
- 観察されたペプチド構造とプロリン・シス・トランス・イソメリズムを相関させるため.
主な方法:
- イオン移動質量スペクトロメトリー (IM-MS) を用いて,BKとその類型を分析した.
- プロリン残基のアラニン置換による7つのアナログペプチドが合成され,分析されました.
- IM-MSデータを比較して,プロリン構成に起因する構造的な違いを特定しました.
主要な成果:
- IM-MS分布は,BKおよびその類似体の異なる構成群を明らかにした.
- プロリンにアラニンを代用することで,形状的景観が変化した.
- データによると,シスとトランスプロリン形態の特定の組み合わせは,異なるペプチド構造と関連している.
結論:
- プロリン残留物,特にそのシス・トランス・アイソメリスムは,ブラジキニンの構成的異質性の重要な決定因子である.
- この研究は,プロリン構成に基づいて観察されたペプチド群の割り当てを提供します.
- 衝突活性化研究は,プロリンイソメリズムに関連した異なる構成状態間の接続性を実証しています.
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