Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

 3D View: Structure | Electron Density

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 86.62 kDa 
• Atom Count: 6232 
• Residue Count: 760 
• Unique protein chains: 3

3BEW

10mer Crystal Structure of chicken MHC class I haplotype B21

• DOI: 10.2210/pdb3BEW/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Gallus gallus
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2007-11-20 Released: 2008-01-01 
• Deposition Author(s): Koch, M., Camp, S., Collen, T., Avila, D., Salomonsen, J., Wallny, H.J., van Hateren, A., Hunt, L., Jacob, J.P., Johnston, F., Marston, D.A., Shaw, I., Dunbar, P.R., Cerundolo, V., Jones, E.Y., Kaufman, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.295 
• R-Value Work: 0.234 
• R-Value Observed: 0.237 

Literature

Structures of an MHC class I molecule from b21 chickens illustrate promiscuous Peptide binding

Koch, M., Camp, S., Collen, T., Avila, D., Salomonsen, J., Wallny, H.-J., van Hateren, A., Hunt, L., Jacob, J.P., Johnston, F., Marston, D.A., Shaw, I., Dunbar, P.R., Cerundolo, V., Jones, E.Y., Kaufman, J.

(2007) Immunity 27: 885-899

• PubMed: 18083574 
• DOI: 10.1016/j.immuni.2007.11.007
• Primary Citation of Related Structures:  
  3BEV, 3BEW


• PubMed Abstract: 
  

Little is known about the structure of major histocompatibility complex (MHC) molecules outside of mammals. Only one class I molecule in the chicken MHC is highly expressed, leading to strong genetic associations with infectious pathogens. Here, we report two structures of the MHC class I molecule BF2*2101 from the B21 haplotype, which is known to confer resistance to Marek's disease caused by an oncogenic herpesvirus. The binding groove has an unusually large central cavity, which confers substantial conformational flexibility to the crucial residue Arg9, allowing remodeling of key peptide-binding sites. The coupled variation of anchor residues from the peptide, utilizing a charge-transfer system unprecedented in MHC molecules, allows peptides with conspicuously different sequences to be bound. This promiscuous binding extends our understanding of ways in which MHC class I molecules can present peptides to the immune system and might explain the resistance of the B21 haplotype to Marek's disease.

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Organizational Affiliation: 

Cancer Research UK Receptor Structure Research Group, The Henry Wellcome Building for Genomic Medicine, Roosevelt Drive, Headington, Oxford OX3 7BN, UK.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Major histocompatibility complex class I glycoprotein haplotype B21	A, D	271	Gallus gallus	Mutation(s): 0  Gene Names: BFIV21, B-FIV, BF2
Find proteins for Q95601 (Gallus gallus) Explore Q95601  Go to UniProtKB:  Q95601

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Beta-2-microglobulin	B, E	99	Gallus gallus	Mutation(s): 0  Gene Names: B2M
Find proteins for P21611 (Gallus gallus) Explore P21611  Go to UniProtKB:  P21611

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
10-mer from Tubulin beta-6 chain	C, F	10	N/A	Mutation(s): 0
Find proteins for P09207 (Gallus gallus) Explore P09207  Go to UniProtKB:  P09207

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.295 
• R-Value Work: 0.234 
• R-Value Observed: 0.237 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 57.393	α = 90
b = 88.711	β = 80.01
c = 100.23	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
PDB_EXTRACT	data extraction
ADSC	data collection
DENZO	data reduction
SCALEPACK	data scaling
MOLREP	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2007-11-20 
• Released Date: 2008-01-01 
Deposition Author(s): Koch, M., Camp, S., Collen, T., Avila, D., Salomonsen, J., Wallny, H.J., van Hateren, A., Hunt, L., Jacob, J.P., Johnston, F., Marston, D.A., Shaw, I., Dunbar, P.R., Cerundolo, V., Jones, E.Y., Kaufman, J.

Revision History 

• Version 1.0: 2008-01-01
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance