5IW1

Crystal Structure of B4.2.3 T-Cell Receptor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.240 
  • R-Value Observed: 0.243 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

An allosteric site in the T-cell receptor C beta domain plays a critical signalling role.

Natarajan, K.McShan, A.C.Jiang, J.Kumirov, V.K.Wang, R.Zhao, H.Schuck, P.Tilahun, M.E.Boyd, L.F.Ying, J.Bax, A.Margulies, D.H.Sgourakis, N.G.

(2017) Nat Commun 8: 15260-15260

  • DOI: 10.1038/ncomms15260
  • Primary Citation of Related Structures:  
    5IVX, 5IW1

  • PubMed Abstract: 
  • The molecular mechanism through which the interaction of a clonotypic αβ T-cell receptor (TCR) with a peptide-loaded major histocompatibility complex (p/MHC) leads to T-cell activation is not yet fully understood. Here we exploit a high-affinity TCR ...

    The molecular mechanism through which the interaction of a clonotypic αβ T-cell receptor (TCR) with a peptide-loaded major histocompatibility complex (p/MHC) leads to T-cell activation is not yet fully understood. Here we exploit a high-affinity TCR (B4.2.3) to examine the structural changes that accompany binding to its p/MHC ligand (P18-I10/H2-D d ). In addition to conformational changes in complementarity-determining regions (CDRs) of the TCR seen in comparison of unliganded and bound X-ray structures, NMR characterization of the TCR β-chain dynamics reveals significant chemical shift effects in sites removed from the MHC-binding site. Remodelling of electrostatic interactions near the Cβ H3 helix at the membrane-proximal face of the TCR, a region implicated in interactions with the CD3 co-receptor, suggests a possible role for an allosteric mechanism in TCR signalling. The contribution of these TCR residues to signal transduction is supported by mutagenesis and T-cell functional assays.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, University of California Santa Cruz, Santa Cruz, California 95064, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
T-CELL RECEPTOR ALPHA CHAINACE194Mus musculusMutation(s): 0 
Gene Names: TCRAV2S6J38
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
T-CELL RECEPTOR BETA CHAINBDF235Mus musculusMutation(s): 0 
Gene Names: TCRAV2S6J38
Protein Feature View
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 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.240 
  • R-Value Observed: 0.243 
  • Space Group: P 31
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.112α = 90
b = 96.112β = 90
c = 167.578γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
SCALEPACKdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-03-29
    Type: Initial release
  • Version 1.1: 2017-06-21
    Changes: Database references