4P23

J809.B5 TCR bound to IAb/3K


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.167 

Starting Model: experimental
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This is version 2.1 of the entry. See complete history


Literature

Effect of CDR3 Sequences and Distal V Gene Residues in Regulating TCR-MHC Contacts and Ligand Specificity.

Stadinski, B.D.Trenh, P.Duke, B.Huseby, P.G.Li, G.Stern, L.J.Huseby, E.S.

(2014) J Immunol 192: 6071-6082

  • DOI: https://doi.org/10.4049/jimmunol.1303209
  • Primary Citation of Related Structures:  
    4P23, 4P46, 4P5T

  • PubMed Abstract: 

    The mature T cell repertoire has the ability to orchestrate immunity to a wide range of potential pathogen challenges. This ability stems from thymic development producing individual T cell clonotypes that express TCRs with unique patterns of Ag reactivity. The Ag specificity of TCRs is created from the combinatorial pairing of one of a set of germline encoded TCR Vα and Vβ gene segments with randomly created CDR3 sequences. How the amalgamation of germline encoded and randomly created TCR sequences results in Ag receptors with unique patterns of ligand specificity is not fully understood. Using cellular, biophysical, and structural analyses, we show that CDR3α residues can modulate the geometry in which TCRs bind peptide-MHC (pMHC), governing whether and how germline encoded TCR Vα and Vβ residues interact with MHC. In addition, a CDR1α residue that is positioned distal to the TCR-pMHC binding interface is shown to contribute to the peptide specificity of T cells. These findings demonstrate that the specificity of individual T cell clonotypes arises not only from TCR residues that create direct contacts with the pMHC, but also from a collection of indirect effects that modulate how TCR residues are used to bind pMHC.


  • Organizational Affiliation

    Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01655; and.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
J809.B5 TCR V alpha chain (Va2.8)199Mus musculusMutation(s): 0 
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
J809.B5 TCR V beta chain (Vb8.2)239Mus musculusMutation(s): 0 
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
H-2 class II histocompatibility antigen, A-B alpha chain179Mus musculusMutation(s): 0 
Gene Names: H2-Aa
UniProt
Find proteins for P14434 (Mus musculus)
Explore P14434 
Go to UniProtKB:  P14434
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UniProt GroupP14434
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
3K peptide and MHC IAb beta chain,H-2 class II histocompatibility antigen, A beta chain218Mus musculusMutation(s): 0 
UniProt
Find proteins for P14483 (Mus musculus)
Explore P14483 
Go to UniProtKB:  P14483
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UniProt GroupP14483
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.167 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 239.121α = 90
b = 73.514β = 90.58
c = 65.73γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
PDB_EXTRACTdata extraction
PHENIXrefinement
HKL-2000data scaling
HKLdata reduction
HKLdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of HealthUnited States--

Revision History  (Full details and data files)

  • Version 1.0: 2014-05-28
    Type: Initial release
  • Version 1.1: 2014-06-25
    Changes: Database references
  • Version 2.0: 2023-12-20
    Changes: Atomic model, Data collection, Database references, Refinement description
  • Version 2.1: 2024-11-06
    Changes: Structure summary