3T0E

Crystal structure of a complete ternary complex of T cell receptor, peptide-MHC and CD4


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.00 Å
  • R-Value Free: 0.305 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.242 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structure of a complete ternary complex of T-cell receptor, peptide-MHC, and CD4.

Yin, Y.Wang, X.X.Mariuzza, R.A.

(2012) Proc Natl Acad Sci U S A 109: 5405-5410

  • DOI: 10.1073/pnas.1118801109
  • Primary Citation of Related Structures:  
    3T0E

  • PubMed Abstract: 
  • Adaptive immunity depends on specific recognition by a T-cell receptor (TCR) of an antigenic peptide bound to a major histocompatibility complex (pMHC) molecule on an antigen-presenting cell (APC). In addition, T-cell activation generally requires binding of this same pMHC to a CD4 or CD8 coreceptor ...

    Adaptive immunity depends on specific recognition by a T-cell receptor (TCR) of an antigenic peptide bound to a major histocompatibility complex (pMHC) molecule on an antigen-presenting cell (APC). In addition, T-cell activation generally requires binding of this same pMHC to a CD4 or CD8 coreceptor. Here, we report the structure of a complete TCR-pMHC-CD4 ternary complex involving a human autoimmune TCR, a myelin-derived self-peptide bound to HLA-DR4, and CD4. The complex resembles a pointed arch in which TCR and CD4 are each tilted ∼65° relative to the T-cell membrane. By precluding direct contacts between TCR and CD4, the structure explains how TCR and CD4 on the T cell can simultaneously, yet independently, engage the same pMHC on the APC. The structure, in conjunction with previous mutagenesis data, places TCR-associated CD3εγ and CD3εδ subunits, which transmit activation signals to the T cell, inside the TCR-pMHC-CD4 arch, facing CD4. By establishing anchor points for TCR and CD4 on the T-cell membrane, the complex provides a basis for understanding how the CD4 coreceptor focuses TCR on MHC to guide TCR docking on pMHC during thymic T-cell selection.


    Organizational Affiliation

    W. M. Keck Laboratory for Structural Biology, Institute for Bioscience and Biotechnology Research, University of Maryland, Rockville, MD 20850, USA.



Macromolecules
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
HLA class II histocompatibility antigen, DRB1-4 beta chainB221Homo sapiensMutation(s): 0 
Gene Names: HLA-DRB1
Find proteins for P01911 (Homo sapiens)
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PHAROS  P01911
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
T-cell receptor beta chainD245Homo sapiensMutation(s): 0 
Gene Names: TRBC2TCRBC2
Find proteins for A0A5B9 (Homo sapiens)
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PHAROS  A0A5B9
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  • Reference Sequence
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
T-cell surface glycoprotein CD4E373Homo sapiensMutation(s): 2 
Gene Names: CD4
Find proteins for P01730 (Homo sapiens)
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PHAROS  P01730
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  • Reference Sequence
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HLA class II histocompatibility antigen, DR alpha chainA182Homo sapiensMutation(s): 0 
Gene Names: HLA-DRAHLA-DRA1
Find proteins for P01903 (Homo sapiens)
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PHAROS  P01903
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
T-cell receptor alpha chainC206Homo sapiensMutation(s): 0 
Gene Names: TRACTCRA
Find proteins for P01848 (Homo sapiens)
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PHAROS  P01848
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.00 Å
  • R-Value Free: 0.305 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.242 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 146.151α = 90
b = 146.151β = 90
c = 231.436γ = 90
Software Package:
Software NamePurpose
JBluIce-EPICSdata collection
PHASERphasing
PHENIXrefinement
CrystalCleardata reduction
CrystalCleardata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-03-07
    Type: Initial release
  • Version 1.1: 2012-04-25
    Changes: Database references
  • Version 1.2: 2017-11-08
    Changes: Advisory, Refinement description