インフルエンザウイルスペプチドを呈するヒトMHC分子の原子構造
M L Silver1, H C Guo, J L Strominger
1Department of Biochemistry and Molecular Biology, Harvard University, Cambridge, Massachusetts 02138.
Nature
|November 26, 1992
まとめ
細胞毒性Tリンパ球は,HLA-Aw68分子によって提示されるインフルエンザウイルスペプチドを認識します. 構造は,ウイルスのペプチド断片がHLA-Aw68に結合し,T細胞受容体認識のための抗原表面を形成する方法を明らかにします.
科学分野:
- 免疫学 免疫学とは
- 構造生物学 構造生物学とは
- ウイルス学 ウイルス学 ウイルス学
背景:
- 細胞毒性Tリンパ球 (CTLs) は,ウイルスに感染した細胞をクリアするために不可欠です.
- CTLのT細胞受容体 (TCR) は,メジャー・ヒストコンパティビリティ・コンプレックス (MHC) クラスIグリコタンパク質によって提示されるウイルスペプチドの断片を認識します.
- この相互作用の構造的基礎を理解することは,免疫反応の解読の鍵です.
研究 の 目的:
- ヒトのHLA-Aw68とインフルエンザウイルスの核タンパク質ペプチド (Np 91-99) の間に形成される複合体の原子構造を決定する.
- MHCクラスI分子へのペプチド結合の分子詳細を解明する.
- TCRによって認識される抗原表面を定義する.
主な方法:
- X線冷凍結晶学を用いて,HLA-Aw68/インフルエンザペプチド複合体の構造を決定した.
- 構造分析は,結合ペプチドの形状と,MHC結合槽内の相互作用に焦点を当てました.
主要な成果:
- インフルエンザウイルスの核タンパク質ペプチドNp 91-99に結合するヒトI級グリコプロテインHLA-Aw68の構造が決定されました.
- ウイルスのペプチドは,HLA-Aw68結合部位内で拡張した形状を採用した.
- 特定のペプチド残留物 (P4-P8) が主に暴露され,認識可能な抗原表面を形成しました.
結論:
- この研究は,インフルエンザ感染中にT細胞受容体によって認識される分子複合体の詳細な原子の見方を提供しています.
- ウイルスのペプチドがHLA-Aw68に結合する方法は,他のMHCアレルに結合する内生ペプチドと類似している.
- この構造情報は,T細胞媒介の抗ウイルス免疫を理解するために不可欠です.
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