フィブロブラスト成長因子受容体エクトドメインの結晶構造は,リガンドとヘパリンに結合する
L Pellegrini1, D F Burke, F von Delft
1Department of Biochemistry, University of Cambridge, UK. luca@cryst.bioc.cam.ac.uk
Nature
|November 9, 2000
まとめ
この研究は,線維細胞成長因子 (FGF) 信号複合体の結晶構造を明らかにしています. この構造は,細胞シグナル伝達のためのFGFと受容体相互作用を媒介するヘパラン硫酸の重要な役割を明らかにしています.
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- 構造生物学 構造生物学とは
背景:
- 線維細胞成長因子 (FGF) は,さまざまな生理学的および病理学的プロセスに関与する重要なタンパク質です.
- FGFのシグナリングは,FGFの三元複合体,その受容体チロシンキナーゼ (FGFR),およびヘパラン硫酸タンパク質グリカンに依存しています.
- このシグナル伝達複合体の正確な分子構造は,ほとんど不明のままである.
研究 の 目的:
- FGFシグナル伝達複合体の分子構造を解明する.
- FGF1とヘパリンに結合するFGFR2エクトドメインの結晶構造を決定する.
- FGF信号伝達におけるヘパラン硫酸塩の役割の構造的基礎を提供すること.
主な方法:
- X線結晶学を用いて,三元複合体の構造を決定した.
- 複合体は,FGFR2エクトドメイン,FGF1,およびヘパリンデカサカリドで構成されていました.
- 構造分析は,組み立てられた信号複合体内の相互作用に焦点を当てた.
主要な成果:
- 結晶構造は,FGF1とヘパリン結合によって誘発されるFGFR2エクトドメインの二次元形を示した.
- 中央ヘパリン分子は2つのFGF1リガンドを橋渡しし,それらは2つの受容体鎖を結びつける.
- ヘパリンの結合は非対称で,FGF1の両方の分子と相互作用するが,1つの受容体鎖のみと相互作用した.
結論:
- 決定された構造は,FGF-FGFR-ヘパラン硫酸塩三重複合体の最初の詳細な分子画像を提供します.
- この構造は,FGFシグナル伝達に不可欠な分子支架としてのヘパラン硫酸塩の重要な役割を強調しています.
- この発見は,FGF媒介の生物学的活動を理解するための構造的基盤を提供する.
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