Biological Assembly 1  

 3D View: Structure

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 5-mer - A1B1C1D1E1 

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

Macromolecule Content

• Total Structure Weight: 93.95 kDa 
• Atom Count: 6576 
• Modelled Residue Count: 826 
• Deposited Residue Count: 826 
• Unique protein chains: 5

1QRN

CRYSTAL STRUCTURE OF HUMAN A6 TCR COMPLEXED WITH HLA-A2 BOUND TO ALTERED HTLV-1 TAX PEPTIDE P6A

• DOI: 10.2210/pdb1QRN/pdb

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


• Deposited: 1999-06-14 Released: 1999-10-14 
• Deposition Author(s): Ding, Y.H., Baker, B.M., Garboczi, D.N., Biddison, W.E., Wiley, D.C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.273 
• R-Value Work: 0.216 

Literature

Four A6-TCR/peptide/HLA-A2 structures that generate very different T cell signals are nearly identical.

Ding, Y.H., Baker, B.M., Garboczi, D.N., Biddison, W.E., Wiley, D.C.

(1999) Immunity 11: 45-56

• PubMed: 10435578 
• DOI: 10.1016/s1074-7613(00)80080-1
• Primary Citation of Related Structures:  
  1QRN, 1QSF, 1QSE


• PubMed Abstract: 
  

The interactions of three singly substituted peptide variants of the HTLV-1 Tax peptide bound to HLA-A2 with the A6 T cell receptor have been studied using T cell assays, kinetic and thermodynamic measurements, and X-ray crystallography. The three peptide/MHC ligands include weak agonists and antagonists with different affinities for TCR. The three-dimensional structures of the three A6-TCR/peptide/HLA-A2 complexes are remarkably similar to each other and to the wild-type agonist complex, with minor adjustments at the interface to accommodate the peptide substitutions (P6A, V7R, and Y8A). The lack of correlation between structural changes and the type of T cell signals induced provides direct evidence that different signals are not generated by different ligand-induced conformational changes in the alphabeta TCR.

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Related Citations: 

• Structure of the Complex between Human T-Cell Receptor, Viral Peptide and Hla-A2
  Garboczi, D.N., Ghosh, P., Utz, U., Fan, Q.R., Wiley, D.C.
  (1996) Nature 384: 134

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Organizational Affiliation: 

Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 02138, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
HLA CLASS I HISTOCOMPATIBILITY ANTIGEN, A-2 ALPHA CHAIN	A	274	Homo sapiens	Mutation(s): 0  Gene Names: HLA-A, HLAA
Find proteins for P04439 (Homo sapiens) Explore P04439  Go to UniProtKB:  P04439
NIH Common Fund Data Resources
PHAROS:  P04439 GTEx:  ENSG00000206503

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

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
TAX PEPTIDE P6A	C	9	N/A	Mutation(s): 0

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
T-CELL RECEPTOR, ALPHA CHAIN	D	200	Homo sapiens	Mutation(s): 0  Gene Names: TRAC, TCRA
Find proteins for P01848 (Homo sapiens) Explore P01848  Go to UniProtKB:  P01848
NIH Common Fund Data Resources
PHAROS:  P01848

Entity ID: 5
Molecule	Chains	Sequence Length	Organism	Details	Image
T-CELL RECEPTOR, BETA CHAIN	E	243	Homo sapiens	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.273 
• R-Value Work: 0.216 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 226.953	α = 90
b = 48.757	β = 90.79
c = 95.551	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
CNS	refinement
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1999-06-14 
• Released Date: 1999-10-14 
Deposition Author(s): Ding, Y.H., Baker, B.M., Garboczi, D.N., Biddison, W.E., Wiley, D.C.

Revision History  

• Version 1.0: 1999-10-14
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance