Biological Assembly 1  

 3D View: Structure | Electron Density

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

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

Macromolecule Content

• Total Structure Weight: 45045.00 
• Atom Count: 3222 
• Residue Count: 385 
• Unique protein chains: 3

3KPO

Crystal Structure of HLA B*4403 in complex with EEYLKAWTF, a mimotope

• DOI: 10.2210/pdb3KPO/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Homo sapiens
• Expression System: Escherichia coli


• Deposited: 2009-11-16 Released: 2009-12-22 
• Deposition Author(s): Macdonald, W.A., Chen, Z., Gras, S., Archbold, J.K., Tynan, F.E., Clements, C.S., Bharadwaj, M., Kjer-Nielsen, L., Saunders, P.M., Wilce, M.C., Crawford, F., Stadinsky, B., Jackson, D., Brooks, A.G., Purcell, A.W., Kappler, J.W., Burrows, S.R., Rossjohn, J., McCluskey, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.3 Å
• R-Value Free: 0.263 
• R-Value Work: 0.200 

Literature

T cell allorecognition via molecular mimicry.

Macdonald, W.A., Chen, Z., Gras, S., Archbold, J.K., Tynan, F.E., Clements, C.S., Bharadwaj, M., Kjer-Nielsen, L., Saunders, P.M., Wilce, M.C., Crawford, F., Stadinsky, B., Jackson, D., Brooks, A.G., Purcell, A.W., Kappler, J.W., Burrows, S.R., Rossjohn, J., McCluskey, J.

(2009) Immunity 31: 897-908

• PubMed: 20064448 
• DOI: 10.1016/j.immuni.2009.09.025
• Primary Citation of Related Structures:  
  3KPS, 3KPR, 3KPQ, 3KPP, 3KPN, 3KPM, 3KPL


• PubMed Abstract: 
  

T cells often alloreact with foreign human leukocyte antigens (HLA). Here we showed the LC13 T cell receptor (TCR), selected for recognition on self-HLA-B( *)0801 bound to a viral peptide, alloreacts with B44 allotypes (HLA-B( *)4402 and HLA-B( *)4405) bound to two different allopeptides. Despite extensive polymorphism between HLA-B( *)0801, HLA-B( *)4402, and HLA-B( *)4405 and the disparate sequences of the viral and allopeptides, the LC13 TCR engaged these peptide-HLA (pHLA) complexes identically, accommodating mimicry of the viral peptide by the allopeptide. The viral and allopeptides adopted similar conformations only after TCR ligation, revealing an induced-fit mechanism of molecular mimicry. The LC13 T cells did not alloreact against HLA-B( *)4403, and the single residue polymorphism between HLA-B( *)4402 and HLA-B( *)4403 affected the plasticity of the allopeptide, revealing that molecular mimicry was associated with TCR specificity. Accordingly, molecular mimicry that is HLA and peptide dependent is a mechanism for human T cell alloreactivity between disparate cognate and allogeneic pHLA complexes.

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Organizational Affiliation: 

The Protein Crystallography Unit, Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria 3800, Australia.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
MHC class I antigen	A	276	Homo sapiens	Mutation(s): 0  Gene Names: HLA-B (HLAB)
Find proteins for P30481 (Homo sapiens) Go to Gene View: HLA-B Go to UniProtKB:  P30481

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Beta-2-microglobulin	B	100	Homo sapiens	Mutation(s): 0  Gene Names: B2M
Find proteins for P61769 (Homo sapiens) Go to Gene View: B2M Go to UniProtKB:  P61769

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details
EEYLKAWTF, mimotope peptide	C	9	N/A	Mutation(s): 0
Protein Feature View is not available: No corresponding UniProt sequence found.

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.3 Å
• R-Value Free: 0.263 
• R-Value Work: 0.200 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 50.870	α = 90.00
b = 81.850	β = 90.00
c = 109.960	γ = 90.00

Software Package:

Software Name	Purpose
XSCALE	data scaling
REFMAC	refinement
PHASER	phasing
PDB_EXTRACT	data extraction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2009-11-16 
• Released Date: 2009-12-22 
• Deposition Author(s): Macdonald, W.A., Chen, Z., Gras, S., Archbold, J.K., Tynan, F.E., Clements, C.S., Bharadwaj, M., Kjer-Nielsen, L., Saunders, P.M., Wilce, M.C., Crawford, F., Stadinsky, B., Jackson, D., Brooks, A.G., Purcell, A.W., Kappler, J.W., Burrows, S.R., Rossjohn, J., McCluskey, J.

Revision History 

• Version 1.0: 2009-12-22
  Type: Initial release
• Version 1.1: 2011-07-13
  Type: Advisory, Version format compliance