3OXS

Crystal Structure of HLA A*02:07 Bound to HBV Core 18-27


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 

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This is version 1.1 of the entry. See complete history


Literature

Structural insights into the binding of hepatitis B virus core peptide to HLA-A2 alleles: Towards designing better vaccines.

Liu, J.Chen, K.Y.Ren, E.C.

(2011) Eur J Immunol 41: 2097-2106

  • DOI: 10.1002/eji.201041370
  • Primary Citation of Related Structures:  
    3OX8, 3OXR, 3OXS

  • PubMed Abstract: 
  • Binding of specific antigenic peptides with human leukocyte antigen (HLA) molecules is a prerequisite for the initiation of T-cell responses and structural information about the peptide-HLA complex is essential for the detailed understanding of such ...

    Binding of specific antigenic peptides with human leukocyte antigen (HLA) molecules is a prerequisite for the initiation of T-cell responses and structural information about the peptide-HLA complex is essential for the detailed understanding of such interactions. HLA-A2 is the most prevalent HLA allele globally but aside from A*02:01 there is a significant lack of crystal structures, particularly for alleles that occur in high frequencies among Asian populations. Here, we report three HLA-A2 structures with the immunodominant hepatitis B core antigen 18-27 (HBcAg18-27) epitope, namely A*02:03, A*02:06, and A*02:07 at resolutions of 2.16, 1.70, and 1.75 Å respectively. This comparative analysis reveals that minor polymorphic residue changes between different HLA alleles can induce significant alterations in the major histocompatibility complex-peptide interface, and introduce conformational changes in the p3-p8 peptide region. Circular dichroism analysis demonstrated the HLA-A2-peptide complexes to have a hierarchy of thermostability and binding affinity in the order of A*02:06>A*02:07>A*02:01>A*02:03. Our findings provide structural insights into the varied HLA-A2 allele binding of the hepatitis B core antigen 18-27 epitope and the data suggest that chemical modifications of the peptide side chains could be a promising strategy to modulate and improve HLA-A2-peptide binding affinity for vaccine design.


    Organizational Affiliation

    Singapore Immunology Network, A*STAR, Immunos, Singapore.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MHC class I antigenA275Homo sapiensMutation(s): 0 
Gene Names: HLA-AMHC HLA-A*02:07
Find proteins for Q861F6 (Homo sapiens)
Explore Q861F6 
Go to UniProtKB:  Q861F6
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-2-microglobulinB100Homo sapiensMutation(s): 0 
Gene Names: B2MBETA 2-MICROGLOBULINCDABP0092HDCMA22P
Find proteins for P61769 (Homo sapiens)
Explore P61769 
Go to UniProtKB:  P61769
NIH Common Fund Data Resources
PHAROS  P61769
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
10mer peptide from Pre-core-proteinC10Hepatitis B virusMutation(s): 0 
Find proteins for P0C6H2 (Hepatitis B virus genotype C (isolate Vietnam/3270/2000))
Explore P0C6H2 
Go to UniProtKB:  P0C6H2
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.21α = 90
b = 79.06β = 90
c = 110γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
AMoREphasing
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-05-04
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance