Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A1BC 

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

Macromolecule Content

• Total Structure Weight: 44.80 kDa 
• Atom Count: 3685 
• Residue Count: 386 
• Unique protein chains: 3

3UTQ

Human HLA-A*0201-ALWGPDPAAA

• DOI: 10.2210/pdb3UTQ/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2011-11-26 Released: 2012-01-25 
• Deposition Author(s): Rizkallah, P.J., Cole, D.K., Sewell, A.K., Bulek, A.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.67 Å
• R-Value Free: 0.244 
• R-Value Work: 0.195 
• R-Value Observed: 0.198 

Literature

Structural basis for the killing of human beta cells by CD8(+) T cells in type 1 diabetes.

Bulek, A.M., Cole, D.K., Skowera, A., Dolton, G., Gras, S., Madura, F., Fuller, A., Miles, J.J., Gostick, E., Price, D.A., Drijfhout, J.W., Knight, R.R., Huang, G.C., Lissin, N., Molloy, P.E., Wooldridge, L., Jakobsen, B.K., Rossjohn, J., Peakman, M., Rizkallah, P.J., Sewell, A.K.

(2012) Nat Immunol 13: 283-289

• PubMed: 22245737 
• DOI: 10.1038/ni.2206
• Structures With Same Primary Citation


• PubMed Abstract: 
  

The structural characteristics of the engagement of major histocompatibility complex (MHC) class II-restricted self antigens by autoreactive T cell antigen receptors (TCRs) is established, but how autoimmune TCRs interact with complexes of self peptide and MHC class I has been unclear. Here we examined how CD8(+) T cells kill human islet beta cells in type 1 diabetes via recognition of a human leukocyte antigen HLA-A*0201-restricted glucose-sensitive preproinsulin peptide by the autoreactive TCR 1E6. Rigid 'lock-and-key' binding underpinned the 1E6-HLA-A*0201-peptide interaction, whereby 1E6 docked similarly to most MHC class I-restricted TCRs. However, this interaction was extraordinarily weak because of limited contacts with MHC class I. TCR binding was highly peptide centric, dominated by two residues of the complementarity-determining region 3 (CDR3) loops that acted as an 'aromatic-cap' over the complex of peptide and MHC class I (pMHCI). Thus, highly focused peptide-centric interactions associated with suboptimal TCR-pMHCI binding affinities might lead to thymic escape and potential CD8(+) T cell-mediated autoreactivity.

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Organizational Affiliation: 

Institute of Infection and Immunity, Cardiff University School of Medicine, Heath Park, Cardiff, UK.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
HLA class I histocompatibility antigen, A-2 alpha chain	A	276	Homo sapiens	Mutation(s): 0  Gene Names: HLA-A, HLAA
Find proteins for P04439 (Homo sapiens) Go to UniProtKB:  P04439
NIH Common Fund Data Resources
PHAROS  P04439 GTEx  ENSG00000206503

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Beta-2-microglobulin	B	100	Homo sapiens	Mutation(s): 0  Gene Names: B2M, CDABP0092, HDCMA22P
Find proteins for P61769 (Homo sapiens) Go to UniProtKB:  P61769
NIH Common Fund Data Resources
PHAROS  P61769 GTEx  ENSG00000166710

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details
Insulin	C	10	Homo sapiens	Mutation(s): 0  Gene Names: INS
Find proteins for P01308 (Homo sapiens) Go to UniProtKB:  P01308
NIH Common Fund Data Resources
PHAROS  P01308

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.67 Å
• R-Value Free: 0.244 
• R-Value Work: 0.195 
• R-Value Observed: 0.198 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 53.1	α = 90
b = 81.15	β = 112.87
c = 56.55	γ = 90

Software Package:

Software Name	Purpose
SCALA	data scaling
REFMAC	refinement
PDB_EXTRACT	data extraction
GDA	data collection
xia2	data reduction
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2011-11-26 
• Released Date: 2012-01-25 
Deposition Author(s): Rizkallah, P.J., Cole, D.K., Sewell, A.K., Bulek, A.M.

Revision History 

• Version 1.0: 2012-01-25
  Type: Initial release
  
• Version 1.1: 2012-03-07
  Changes: Database references