4G42

Structure of the Chicken MHC Class I Molecule BF2*0401 complexed to pepitde P8D


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.294 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.196 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

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:  

  • 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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MHC class I alpha chain 2
A, D
275Gallus gallusMutation(s): 1 
Gene Names: B-FIV (BF2)
Find proteins for O46790 (Gallus gallus)
Go to UniProtKB:  O46790
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Beta-2 microglobulin
B, E
101Gallus gallusMutation(s): 0 
Gene Names: B2M
Find proteins for P21611 (Gallus gallus)
Go to Gene View: B2M
Go to UniProtKB:  P21611
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
8-MERIC PEPTIDE P8D
C, F
8Gallus gallusMutation(s): 0 
Find proteins for Q6J4Y8 (Gallus gallus)
Go to UniProtKB:  Q6J4Y8
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.294 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.196 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 165.832α = 90.00
b = 40.108β = 119.56
c = 130.952γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
CNSrefinement
HKL-2000data reduction
CNSphasing
HKL-2000data scaling
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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