2AK4

Crystal Structure of SB27 TCR in complex with HLA-B*3508-13mer peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.247 

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This is version 1.2 of the entry. See complete history


Literature

T cell receptor recognition of a 'super-bulged' major histocompatibility complex class I-bound peptide

Tynan, F.E.Burrows, S.R.Buckle, A.M.Clements, C.S.Borg, N.A.Miles, J.J.Beddoe, T.Whisstock, J.C.Wilce, M.C.Silins, S.L.Burrows, J.M.Kjer-Nielsen, L.Kostenko, L.Purcell, A.W.McCluskey, J.Rossjohn, J.

(2005) Nat Immunol 6: 1114-1122

  • DOI: 10.1038/ni1257
  • Primary Citation of Related Structures:  
    2AK4

  • PubMed Abstract: 
  • Unusually long major histocompatibility complex (MHC) class I-restricted epitopes are important in immunity, but their 'bulged' conformation represents a potential obstacle to alphabeta T cell receptor (TCR)-MHC class I docking. To elucidate how such ...

    Unusually long major histocompatibility complex (MHC) class I-restricted epitopes are important in immunity, but their 'bulged' conformation represents a potential obstacle to alphabeta T cell receptor (TCR)-MHC class I docking. To elucidate how such recognition is achieved while still preserving MHC restriction, we have determined here the structure of a TCR in complex with HLA-B(*)3508 presenting a peptide 13 amino acids in length. This complex was atypical of TCR-peptide-MHC class I interactions, being dominated at the interface by peptide-mediated interactions. The TCR assumed two distinct orientations, swiveling on top of the centrally bulged, rigid peptide such that only limited contacts were made with MHC class I. Although the TCR-peptide recognition resembled an antibody-antigen interaction, the TCR-MHC class I contacts defined a minimal 'generic footprint' of MHC-restriction. Thus our findings simultaneously demonstrate the considerable adaptability of the TCR and the 'shape' of MHC restriction.


    Organizational Affiliation

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



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HLA-B35 variantAFKQ276Homo sapiensMutation(s): 0 
Gene Names: HLA-BHLAB
Find proteins for P01889 (Homo sapiens)
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PHAROS  P01889
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-2-microglobulinBGLR99Homo sapiensMutation(s): 0 
Gene Names: B2MCDABP0092HDCMA22P
Find proteins for P61769 (Homo sapiens)
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PHAROS  P61769
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
EBV peptide LPEPLPQGQLTAYCHMS13N/AMutation(s): 0 
Find proteins for P03206 (Epstein-Barr virus (strain B95-8))
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
SB27 T cell receptor alpha chainDINT211Homo sapiensMutation(s): 0 
Gene Names: TRACTCRA
Find proteins for P01848 (Homo sapiens)
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PHAROS  P01848
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  • Reference Sequence
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
SB27 T cell receptor beta chainEJPU245Homo sapiensMutation(s): 0 
Gene Names: TRBC1
Find proteins for P01850 (Homo sapiens)
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
IOD
Query on IOD

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A, B, C, D, E, F, G, H, J, K, L, Q, R, S
IODIDE ION
I
XMBWDFGMSWQBCA-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.247 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.154α = 90
b = 213.282β = 89.94
c = 122.303γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
SCALEPACKdata scaling
PHASERphasing

Structure Validation

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Entry History 

Revision History 

  • Version 1.0: 2005-10-11
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance