2E7L

Structure of a high-affinity mutant of the 2C TCR in complex with Ld/QL9


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.224 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

How a single T cell receptor recognizes both self and foreign MHC.

Colf, L.A.Bankovich, A.J.Hanick, N.A.Bowerman, N.A.Jones, L.L.Kranz, D.M.Garcia, K.C.

(2007) Cell 129: 135-146

  • DOI: 10.1016/j.cell.2007.01.048
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • alphabeta T cell receptors (TCRs) can crossreact with both self- and foreign- major histocompatibility complex (MHC) proteins in an enigmatic phenomenon termed alloreactivity. Here we present the 2.35 A structure of the 2C TCR complexed with its fore ...

    alphabeta T cell receptors (TCRs) can crossreact with both self- and foreign- major histocompatibility complex (MHC) proteins in an enigmatic phenomenon termed alloreactivity. Here we present the 2.35 A structure of the 2C TCR complexed with its foreign ligand H-2L(d)-QL9. Surprisingly, we find that this TCR utilizes a different strategy to engage the foreign pMHC in comparison to the manner in which it recognizes a self ligand H-2K(b)-dEV8. 2C engages both shared and polymorphic residues on L(d) and K(b), as well as the unrelated QL9 and dEV8 peptide antigens, in unique pair-wise contacts, resulting in greater structural complementarity with the L(d)-QL9 complex. In the structure of an engineered, high-affinity 2C TCR variant bound to H-2L(d)-QL9, the "wild-type" TCR-MHC binding orientation persists despite modified TCR-CDR3alpha interactions with peptide. Thus, a single TCR recognizes two globally similar, but distinct ligands by divergent mechanisms, indicating that receptor-ligand crossreactivity can occur in the absence of molecular mimicry.


    Organizational Affiliation

    Howard Hughes Medical Institute, Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA 94305, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cytotoxic Tcell receptor
A, B
113Mus musculusMutation(s): 7 
Find proteins for A2NTU7 (Mus musculus)
Go to UniProtKB:  A2NTU7
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Beta-chain
C, D
121Mus musculusMutation(s): 9 
Find proteins for A2NTY6 (Mus musculus)
Go to UniProtKB:  A2NTY6
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
H-2 class I histocompatibility antigen, L-D alpha chain
E, F
181Mus musculusMutation(s): 6 
Gene Names: H2-L
Find proteins for P01897 (Mus musculus)
Go to UniProtKB:  P01897
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Peptide (GLN)(LEU)(SER)(PRO)(PHE)(PRO)(PHE)(ASP)(LEU)
P, Q
9N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.224 
  • Space Group: P 42 21 2
Unit Cell:
Length (Å)Angle (°)
a = 113.540α = 90.00
b = 113.540β = 90.00
c = 177.452γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
REFMACrefinement
PHASERphasing
HKL-2000data collection
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-04-24
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2011-07-27
    Type: Database references