タイロシン・フォスファタゼの粘着相互作用の構造は,スペーサー・クランプメカニズムを明らかにする
A Radu Aricescu1, Christian Siebold, Kaushik Choudhuri
1Cancer Research UK Receptor Structure Research Group, University of Oxford, Henry Wellcome Building of Genomic Medicine, Division of Structural Biology, Roosevelt Drive, Oxford OX3 7BN, UK.
Science (New York, N.Y.)
|September 1, 2007
まとめ
ヒトのRPTPmuは,タンパク質チロシン・フォスファタゼで,固体ジマーを形成し,分子ルールの役割を果たします. この構造は,アデレンス接合点の細胞間の距離を制御することによって,細胞間の粘着を調節するのに役立ちます.
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:
- 細胞と細胞の接触は,多細胞生物にとって極めて重要です.
- 人間のRPTPmuは,受容体タンパク質チロシンフォスファタゼであり,細胞粘着の調節に関与しています.
- カデリン-カテニン複合体を脱酸化する.
研究 の 目的:
- RPTPmu ectodomainの結晶構造を決定するために.
- 細胞粘着におけるRPTPmuの役割の構造的基礎を理解する.
- RPTPmuが細胞間間隔をどのように調節するかを調査する.
主な方法:
- X線結晶学 (3.1アングストーム解像度).
- RPTPmu エクトドメインの構造と二分化の分析.
- 細胞間間隔を測定するための消去構造の細胞表面表現.
主要な成果:
- RPTPmuエクトドメインは,同型トランス (反並列) ダイマーを形成する.
- ダイマーは拡張され,頑丈なアーキテクチャを示し,結合寸法にマッチングします.
- 削除構造によって誘発される細胞間距離は,エクトドメインの長さと相関する.
結論:
- RPTPmu エクトドメインは距離計として機能します.
- フォスファタゼをアデレンス接合点に配置する上で重要な規制的役割を果たします.
- この構造的な洞察は,細胞粘着を制御するRPTPmuのメカニズムを明確にします.
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