1B0G

CLASS I HISTOCOMPATIBILITY ANTIGEN (HLA-A2.1)/BETA 2-MICROGLOBULIN/PEPTIDE P1049 COMPLEX

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.255 
  • R-Value Observed: 0.260 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history. 


Literature

Structural evidence of T cell xeno-reactivity in the absence of molecular mimicry.

Zhao, R., Loftus, D.J., Appella, E., Collins, E.J.

(1999) J Exp Med 189: 359-370

  • DOI: 10.1084/jem.189.2.359
  • Primary Citation of Related Structures:  
    1BZ9, 1B0G

  • PubMed Abstract: 

    • The T cell receptor (TCR), from a xeno-reactive murine cytotoxic T lymphocyte clone AHIII12.2, recognizes murine H-2Db complexed with peptide p1027 (FAPGVFPYM), as well as human HLA-A2.1 complexed with peptide p1049 (ALWGFFPVL). A commonly proposed model (the molecular mimicry model) used to explain TCR cross-reactivity suggests that the molecular surfaces of the recognized complexes are similar in shape, charge, or both, in spite of the primary sequence differences ...

    The T cell receptor (TCR), from a xeno-reactive murine cytotoxic T lymphocyte clone AHIII12.2, recognizes murine H-2Db complexed with peptide p1027 (FAPGVFPYM), as well as human HLA-A2.1 complexed with peptide p1049 (ALWGFFPVL). A commonly proposed model (the molecular mimicry model) used to explain TCR cross-reactivity suggests that the molecular surfaces of the recognized complexes are similar in shape, charge, or both, in spite of the primary sequence differences. To examine the mechanism of xeno-reactivity of AHIII12.2, we have determined the crystal structures of A2/p1049 and Db/p1027 to 2.5 A and 2.8 A resolution, respectively. The crystal structures show that the TCR footprint regions of the two class I complexes are significantly different in shape and charge. We propose that rather than simple molecular mimicry, unpredictable arrays of common and differential contacts on the two class I complexes are used for their recognition by the same TCR.

    Organizational Affiliation: 

    Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CLASS I HISTOCOMPATIBILITY ANTIGENA, D275Homo sapiensMutation(s): 0 
Gene Names: HLA-A, HLAA
UniProt & NIH Common Fund Data Resources
Find proteins for P04439 (Homo sapiens)
Explore P04439 
Go to UniProtKB:  P04439
PHAROS:  P04439
GTEx:  ENSG00000206503
Protein Feature View
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  • Reference Sequence
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(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
BETA 2-MICROGLOBULINB, E100Homo sapiensMutation(s): 0 
Gene Names: B2M, CDABP0092, HDCMA22P
UniProt & NIH Common Fund Data Resources
Find proteins for P61769 (Homo sapiens)
Explore P61769 
Go to UniProtKB:  P61769
PHAROS:  P61769
GTEx:  ENSG00000166710
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
PEPTIDE P1049 (ALWGFFPVL)C, F9N/AMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9NPA0 (Homo sapiens)
Explore Q9NPA0 
Go to UniProtKB:  Q9NPA0
PHAROS:  Q9NPA0
GTEx:  ENSG00000134153
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.255 
  • R-Value Observed: 0.260 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.09α = 81.98
b = 62.89β = 76.18
c = 74.68γ = 77.86
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 1998-11-09 
  • Released Date: 1998-11-18 
    • Deposition Author(s): Zhao, R., Collins, E.J.
  • This entry supersedes: 1A9K

Revision History  (Full details and data files)

  • Version 1.0: 1998-11-18
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2013-07-10
    Changes: Other