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受容体活性化のためのSmadアンカーによるSmad2認識の構造的基礎

G Wu¹, Y G Chen, B Ozdamar

¹Department of Molecular Biology, Princeton University, Lewis Thomas Laboratory, Princeton, NJ 08544, USA.

Science (New York, N.Y.)

|December 30, 1999

まとめ

Smadアンカー・フォー・レセプター・アクティベーション (SARA) はSmad2と結合し,成長因子β (TGFβ) のシグナリング特異性と親和性を変換するのに重要な構造的詳細を明らかにします. この構造的な洞察は,受容体調節されたSmad認識の理解を助けます.

科学分野:

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
細胞シグナル伝達細胞信号伝達

背景:

Smadタンパク質は,成長因子β (TGFβ) 信号伝達の変換の重要な媒介者である.
Smadアンカー・フォー・レセプター・アクティベーション (SARA) は,Smad2のTGFβ受容体への勧誘を容易にする.

研究の目的:

SARA Smad-binding domain (SBD) と複合したSmad2 MH2ドメインの結晶構造を決定する.
Smad2-SARAの結合特異性と親和性を支配する分子相互作用を解明する.

主な方法:

2.2アングストームの解像度のX線結晶学.
タンパク質とタンパク質の相互作用の構造分析.

主要な成果:

SARA SBDは拡張された形状を採用し,Smad2のβシートと3ヘリックスバンドルと相互作用します.
特定の認識には,SARAの硬いコイルとSmad2βシートが含まれています.
高結合親和性は,SARAベータ鎖とSmad2の3ヘリックスバンドルの間の相互作用によって媒介されます.

結論:

決定された構造は,Smad2-SARA相互作用の詳細な分子基礎を提供します.
この構造情報は,受容体調節されたSmadsがI型受容体によって認識される方法についての洞察を提供します.

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