4E0R

Structure of the chicken MHC class I molecule BF2*0401


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.26 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.200 

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Literature

Narrow Groove and Restricted Anchors of MHC Class I Molecule BF2*0401 Plus Peptide Transporter Restriction Can Explain Disease Susceptibility of B4 Chickens.

Zhang, J.Chen, Y.Qi, J.Gao, F.Liu, Y.Liu, J.Zhou, X.Kaufman, J.Xia, C.Gao, G.F.

(2012) J Immunol 189: 4478-4487

  • DOI: 10.4049/jimmunol.1200885
  • Primary Citation of Related Structures:  
    4G42, 4G43, 4E0R

  • PubMed Abstract: 
  • The MHC has genetic associations with many diseases, often due to differences in presentation of antigenic peptides by polymorphic MHC molecules to T lymphocytes of the immune system. In chickens, only a single classical class I molecule in each MHC ...

    The MHC has genetic associations with many diseases, often due to differences in presentation of antigenic peptides by polymorphic MHC molecules to T lymphocytes of the immune system. In chickens, only a single classical class I molecule in each MHC haplotype is expressed well due to coevolution with the polymorphic TAPs which means that resistance and susceptibility to infectious pathogens are particularly easy to observe. Previously, structures of chicken MHC class I molecule BF2*2101 from B21 haplotype showed an unusually large peptide-binding groove that accommodates a broad spectrum of peptides to present as epitopes to CTLs, explaining the MHC-determined resistance of B21 chickens to Marek's disease. In this study, we report the crystal structure of BF2*0401 from the B4 (also known as B13) haplotype, showing a highly positively charged surface hitherto unobserved in other MHC molecules, as well as a remarkably narrow groove due to the allele-specific residues with bulky side chains. Together, these properties limit the number of epitope peptides that can bind this class I molecule. However, peptide-binding assays show that in vitro, BF2*0401 can bind a wider variety of peptides than are found on the surface of B4 cells. Thus, a combination of the specificities of the polymorphic TAP and the MHC results in a very limited set of BF2*0401 peptides with negatively charged anchors to be presented to T lymphocytes.


    Organizational Affiliation

    Department of Microbiology and Immunology, College of Veterinary Medicine, China Agricultural University, Beijing 100094, China.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MHC class I alpha chain 2AD275Gallus gallusMutation(s): 1 
Gene Names: B-FIVBF2
Find proteins for O46790 (Gallus gallus)
Explore O46790 
Go to UniProtKB:  O46790
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-2 microglobulinBE101Gallus gallusMutation(s): 0 
Gene Names: B-F-S-b2m02B2M
Find proteins for P21611 (Gallus gallus)
Explore P21611 
Go to UniProtKB:  P21611
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
8-MERIC PEPTIDE (FUS/TLS)CF8Gallus gallusMutation(s): 0 
Find proteins for Q6J4Y8 (Gallus gallus)
Explore Q6J4Y8 
Go to UniProtKB:  Q6J4Y8
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.26 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.200 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 166.196α = 90
b = 40.286β = 119.71
c = 131.585γ = 90
Software Package:
Software NamePurpose
CrystalCleardata collection
AMoREphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-11-21
    Type: Initial release