クラトリンの原子構造:ベータプロペラ端末ドメインがアルファジグザグリンクヤーに結合する
E ter Haar1, A Musacchio, S C Harrison
1Department of Cell Biology and Center for Blood Research, Harvard Medical School, Boston, Massachusetts 02115-5701, USA.
Cell
|November 25, 1998
まとめ
クラトリンの重鎖のN端の断片の結晶構造は,ベータプロペラ端領域を明らかにする. この構造は,アダプタータンパク質とアストリンとの相互作用を容易にし,コーティングピット組織と膜取引に不可欠です.
科学分野:
- 構造生物学 構造生物学とは
- 細胞生物学 細胞生物学
- バイオケミストリー バイオケミストリー
背景:
- クラトリントリスケイオンは,コーティングピッツのタンパク質格子を形成するために不可欠です.
- このグリッドは,タンパク質の徴集を組織し,エンドサイトーシス中の脂質二重層ベジキュレーションを駆動します.
- クラトリンの構造を理解することは,細胞の密輸メカニズムを解読する鍵です.
研究 の 目的:
- クラトリン重鎖のN端の断片の結晶構造を決定する.
- クラトリンの他の細胞成分との相互作用の構造的基礎を解明する.
- クラトリンの網羅の組織に関する洞察を提供するために.
主な方法:
- 3D構造を決定するために,X線結晶学を用いた.
- 190kDaのクラスリン重鎖の55kDaのN端の断片が結晶化されました.
- 結晶構造の解像度は2.6 Å.と決定されました.
主要な成果:
- 結晶構造は,端末領域のための7刃のベータプロペラ折れを明らかにしました.
- アルファヘリコプター状のジグザグを特徴とするリンク器領域は,端末領域をトリスケリオンの足と接続します.
- ベータプロペラ構造は,複数のタンパク質パートナーを結合するのに適しています.
結論:
- N端の断片構造は,タンパク質の徴募におけるクラトリンの役割の分子基盤を提供する.
- 特定された構造は,AP-1/AP-2などの分類アダプターと非視覚アレストインとの相互作用を容易にする.
- 提案された螺旋型のジグザグモチーフは,クラトリンの足に沿って伸び,格子形成に貢献する可能性があります.
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