血管細胞粘着分子-1のインテグリン結合断片の結晶構造は1.8A解像度で
E Y Jones1, K Harlos, M J Bottomley
1Laboratory of Molecular Biophysics, Oxford Centre for Molecular Sciences, UK.
Nature
|February 9, 1995
まとめ
血管細胞粘着分子-1 (VCAM-1) は,VLA-4インテグリンと結合する. 結晶構造は,VCAM-1のインテグリン結合モチーフがドメイン1で露出していることを明らかにしています.
科学分野:
- 免疫学 免疫学とは
- 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:
- 血管細胞粘着分子-1 (VCAM-1) は,細胞表面のグリコタンパク質であり,細胞間粘着を媒介する.
- VCAM-1は免疫グロブリンスーパーファミリーに属し,炎症および病原体の細胞受容体として役割を果たします.
- VCAM-1のインビヴォの有力な形態は,7ドメインの細胞外領域を特徴とし,ドメイン1と4でインテグリン結合モチーフが保存されている.
研究 の 目的:
- VCAM-1のVLA-4結合断片の結晶構造を決定する.
- VLA-4がVCAM-1に結合する構造的基礎を解明する.
- インテグリン結合モチーフの特定の形状と位置を特定するために.
主な方法:
- X線結晶学を用いて,VCAM-1 (ドメイン1と2) のVLA-4結合断片の構造を決定した.
- インテグリン結合モチーフとその形状を特定するために結晶構造の分析.
- VCAM-1構造のVLA-4結合部位のマッピング VCAM-1構造のVLA-4結合部位のマッピング
主要な成果:
- VCAM-1の最初の2つのドメインの結晶構造が決定されました.
- ループのN端部に位置するドメイン1で,高露出性のインテグリン結合モチーフ (Q38IDSPL) が特定されました.
- VLA-4結合部位は,CFGベータシートの面にマッピングされ,免疫グロブリン超家族相互作用に関する以前の発見と一致しました.
結論:
- VCAM-1ドメイン1の暴露されたインテグリン結合モチーフは,特徴的な形状を採用しています.
- この形状は,インテグリン結合免疫グロブリンスーパーファミリー分子に共通すると予測されています.
- この研究は,VLA-4/VCAM-1の相互作用に関する構造的な洞察を提供し,細胞結合と炎症を理解するために重要である.
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