4HUX

Crystal Structure of H2Db-H155A-NP

4HUX の概要

• エントリーDOI: 10.2210/pdb4hux/pdb
• 関連するPDBエントリー: 1hoc 3cpl 4HUU 4HUV 4HUW 4HV8
• 分子名称: H-2 class I histocompatibility antigen, D-B alpha chain, Beta-2-microglobulin, NP peptide, ... (6 entities in total)
• 機能のキーワード: viral immunity, t cell, h2db, influenza, viral escape, immune system
• 由来する生物種: Mus musculus (mouse); 詳細
• 細胞内の位置: Membrane; Single-pass type I membrane protein: P01899; Secreted: P01887
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 45332.72

構造登録者

Gras, S.,Twist, K.A.,Rossjohn, J. (登録日: 2012-11-05, 公開日: 2013-02-27, 最終更新日: 2024-10-30)

主引用文献

Valkenburg, S.A.,Gras, S.,Guillonneau, C.,Hatton, L.A.,Bird, N.A.,Twist, K.A.,Halim, H.,Jackson, D.C.,Purcell, A.W.,Turner, S.J.,Doherty, P.C.,Rossjohn, J.,Kedzierska, K.
Preemptive priming readily overcomes structure-based mechanisms of virus escape.
Proc.Natl.Acad.Sci.USA, 110:5570-5575, 2013

PubMed Abstract: A reverse-genetics approach has been used to probe the mechanism underlying immune escape for influenza A virus-specific CD8(+) T cells responding to the immunodominant D(b)NP366 epitope. Engineered viruses with a substitution at a critical residue (position 6, P6M) all evaded recognition by WT D(b)NP366-specific CD8(+) T cells, but only the NPM6I and NPM6T mutants altered the topography of a key residue (His155) in the MHC class I binding site. Following infection with the engineered NPM6I and NPM6T influenza viruses, both mutations were associated with a substantial "hole" in the naïve T-cell receptor repertoire, characterized by very limited T-cell receptor diversity and minimal primary responses to the NPM6I and NPM6T epitopes. Surprisingly, following respiratory challenge with a serologically distinct influenza virus carrying the same mutation, preemptive immunization against these escape variants led to the generation of secondary CD8(+) T-cell responses that were comparable in magnitude to those found for the WT NP epitope. Consequently, it might be possible to generate broadly protective T-cell immunity against commonly occurring virus escape mutants. If this is generally true for RNA viruses (like HIV, hepatitis C virus, and influenza) that show high mutation rates, priming against predicted mutants before an initial encounter could function to prevent the emergence of escape variants in infected hosts. That process could be a step toward preserving immune control of particularly persistent RNA viruses and may be worth considering for future vaccine strategies.

PubMed: 23493558
DOI: 10.1073/pnas.1302935110

実験手法

X-RAY DIFFRACTION (2.2 Å)