タイプIIカデリンエクトドメイン構造:古典的なカデリン特異性への影響
Saurabh D Patel1, Carlo Ciatto, Chien Peter Chen
1Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA.
Cell
|March 28, 2006
まとめ
クラシックなカデリン (タイプIとII) は細胞結合を媒介する. 構造分析は,交換されたベータ鎖と保存されたトリプトファンの残留物によって駆動され,細胞特異性を決定する,タイプIIカデリンにおけるユニークな粘着性インターフェースを明らかにします.
科学分野:
- 細胞生物学 細胞生物学
- 構造生物学 構造生物学とは
- バイオケミストリー バイオケミストリー
背景:
- 古典的なカデリン (タイプIとII) は,重要な細胞粘着分子である.
- 細胞外ドメインは,細胞間の認識と特異性を決定する.
研究 の 目的:
- タイプIIの古典的なカデリンの細胞粘着特異性の構造的基礎を解明する.
- タイプIとタイプIIのカデリンの接着剤インターフェイスを比較するために.
主な方法:
- 3つのタイプIIカデリンからエクトドメイン領域の結晶構造の決定.
- タンパク質のインターフェースと保存された残留物の分析.
- キメリックカデリンを用いたインビトロおよびインビボ機能性アッセイ.
主要な成果:
- II型カデリンは,細胞外カデリン-1 (EC1) ドメインの交換されたN端ベータ鎖を介して,粘着ジマーを形成する.
- これらのインターフェースには,2つの保存されたトリプトファン残留物と,タイプIカデリンとは異なるユニークな水害性領域が特徴です.
- タイプIとタイプIIのカデリンの両方のEC1ドメインは,細胞の粘着特異性をin vitroで決定する.
- 化学カデリンの実験では,EC1ドメインの同一性が,体内におけるモーターニューロン分離におけるタイプIIカデリンの機能に決定的であることを示しています.
結論:
- EC1ドメイン,特に構造的に定義された粘着性インターフェースは, in vivo でタイプIIカデリンに対する機能的特異性をコードします.
- EC1ドメインのインターフェースの構造的な違いは,タイプIとタイプIIのカデリンの固着性特性に寄与する.
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