3KXF

Crystal Structure of SB27 TCR in complex with the 'restriction triad' mutant HLA-B*3508-13mer


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.213 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Hard wiring of T cell receptor specificity for the major histocompatibility complex is underpinned by TCR adaptability

Burrows, S.R.Chen, Z.Archbold, J.K.Tynan, F.E.Beddoe, T.Kjer-Nielsen, L.Miles, J.J.Khanna, R.Moss, D.J.Liu, Y.C.Gras, S.Kostenko, L.Brennan, R.M.Clements, C.S.Brooks, A.G.Purcell, A.W.McCluskey, J.Rossjohn, J.

(2010) Proc.Natl.Acad.Sci.USA 107: 10608-10613

  • DOI: 10.1073/pnas.1004926107
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • alphabeta T cell receptors (TCRs) are genetically restricted to corecognize peptide antigens bound to self-major histocompatibility complex (pMHC) molecules; however, the basis for this MHC specificity remains unclear. Despite the current dogma, eval ...

    alphabeta T cell receptors (TCRs) are genetically restricted to corecognize peptide antigens bound to self-major histocompatibility complex (pMHC) molecules; however, the basis for this MHC specificity remains unclear. Despite the current dogma, evaluation of the TCR-pMHC-I structural database shows that the nongermline-encoded complementarity-determining region (CDR)-3 loops often contact the MHC-I, and the germline-encoded CDR1 and -2 loops frequently participate in peptide-mediated interactions. Nevertheless, different TCRs adopt a roughly conserved docking mode over the pMHC-I, in which three MHC-I residues (65, 69, and 155) are invariably contacted by the TCR in one way or another. Nonetheless, the impact of mutations at these three positions, either individually or together, was not uniformly detrimental to TCR recognition of pHLA-B*0801 or pHLA-B*3508. Moreover, when TCR-pMHC-I recognition was impaired, this could be partially restored by expression of the CD8 coreceptor. The structure of a TCR-pMHC-I complex in which these three (65, 69, and 155) MHC-I positions were all mutated resulted in shifting of the TCR footprint relative to the cognate complex and formation of compensatory interactions. Collectively, our findings reveal the inherent adaptability of the TCR in maintaining peptide recognition while accommodating changes to the central docking site on the pMHC-I.


    Organizational Affiliation

    Cellular Immunology Laboratory, Queensland Institute of Medical Research and Australian Centre for Vaccine Development, Brisbane 4029, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HLA class I histocompatibility antigen, B-35 alpha chain
A, C, K, I
276Homo sapiensMutation(s): 3 
Gene Names: HLA-B (HLAB)
Find proteins for P30685 (Homo sapiens)
Go to Gene View: HLA-B
Go to UniProtKB:  P30685
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Beta-2-microglobulin
B, F, L, J
99Homo sapiensMutation(s): 0 
Gene Names: B2M
Find proteins for P61769 (Homo sapiens)
Go to Gene View: B2M
Go to UniProtKB:  P61769
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
SB27 T cell receptor alpha chain
D, G, N, M
204Homo sapiensMutation(s): 0 
Gene Names: TRAC (TCRA)
Find proteins for P01848 (Homo sapiens)
Go to UniProtKB:  P01848
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
SB27 T cell receptor beta chain
E, H, P, O
241Homo sapiensMutation(s): 0 
Gene Names: TRBC2 (TCRBC2)
Find proteins for A0A5B9 (Homo sapiens)
Go to UniProtKB:  A0A5B9
Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
peptide from Trans-activator protein BZLF1
Q, R, T, S
13Epstein-Barr virus (strain B95-8)Mutation(s): 0 
Find proteins for P03206 (Epstein-Barr virus (strain B95-8))
Go to UniProtKB:  P03206
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
IOD
Query on IOD

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J, K, L, P
IODIDE ION
I
XMBWDFGMSWQBCA-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.213 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 78.690α = 90.00
b = 207.077β = 90.19
c = 123.512γ = 90.00
Software Package:
Software NamePurpose
XSCALEdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-06-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2014-02-26
    Type: Database references