4HUW

Crystal Structure of H2Db-NPM6T

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.16 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.181 

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This is version 1.3 of the entry. See complete history. 


Literature

Preemptive priming readily overcomes structure-based mechanisms of virus escape.

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.

(2013) Proc Natl Acad Sci U S A 110: 5570-5575

  • DOI: 10.1073/pnas.1302935110
  • Primary Citation of Related Structures:  
    4HUU, 4HUV, 4HUW, 4HUX, 4HV8

  • 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 ...

    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.

    Organizational Affiliation: 

    Department of Microbiology and Immunology, University of Melbourne, Parkville, VIC 3010, Australia.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
H-2 class I histocompatibility antigen, D-B alpha chainA, C, E, G281Mus musculusMutation(s): 0 
Gene Names: H2-D1
UniProt
Find proteins for P01899 (Mus musculus)
Explore P01899 
Go to UniProtKB:  P01899
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UniProt GroupP01899
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-2-microglobulinB, D, F, H100Mus musculusMutation(s): 0 
Gene Names: B2m
UniProt & NIH Common Fund Data Resources
Find proteins for P01887 (Mus musculus)
Explore P01887 
Go to UniProtKB:  P01887
IMPC:  MGI:88127
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UniProt GroupP01887
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
NPM6T variant peptideI, J, K, L9N/AMutation(s): 0 
UniProt
Find proteins for Q5Q157 (Influenza A virus)
Explore Q5Q157 
Go to UniProtKB:  Q5Q157
Entity Groups  
UniProt GroupQ5Q157
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.16 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.181 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.93α = 90
b = 84.68β = 90.93
c = 136.42γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PHASERphasing
BUSTER-TNTrefinement
PDB_EXTRACTdata extraction
Blu-Icedata collection
XDSdata reduction
BUSTERrefinement

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-02-27
    Type: Initial release
  • Version 1.1: 2013-03-27
    Changes: Database references
  • Version 1.2: 2013-04-24
    Changes: Database references
  • Version 1.3: 2017-11-15
    Changes: Advisory, Refinement description