4EN3

Crystal structure of a human Valpha24(-) NKT TCR in complex with CD1d/alpha-galactosylceramide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.568 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

The Molecular Basis for Recognition of CD1d/alpha-Galactosylceramide by a Human Non-Valpha24 T Cell Receptor Struct. Title

Lopez-Sagaseta, J.Kung, J.E.Savage, P.B.Gumperz, J.Adams, E.J.

(2012) Plos Biol. 10: e1001412-e1001412

  • DOI: 10.1371/journal.pbio.1001412

  • PubMed Abstract: 
  • CD1d-mediated presentation of glycolipid antigens to T cells is capable of initiating powerful immune responses that can have a beneficial impact on many diseases. Molecular analyses have recently detailed the lipid antigen recognition strategies uti ...

    CD1d-mediated presentation of glycolipid antigens to T cells is capable of initiating powerful immune responses that can have a beneficial impact on many diseases. Molecular analyses have recently detailed the lipid antigen recognition strategies utilized by the invariant Vα24-Jα18 TCR rearrangements of iNKT cells, which comprise a subset of the human CD1d-restricted T cell population. In contrast, little is known about how lipid antigens are recognized by functionally distinct CD1d-restricted T cells bearing different TCRα chain rearrangements. Here we present crystallographic and biophysical analyses of α-galactosylceramide (α-GalCer) recognition by a human CD1d-restricted TCR that utilizes a Vα3.1-Jα18 rearrangement and displays a more restricted specificity for α-linked glycolipids than that of iNKT TCRs. Despite having sequence divergence in the CDR1α and CDR2α loops, this TCR employs a convergent recognition strategy to engage CD1d/αGalCer, with a binding affinity (∼2 µM) almost identical to that of an iNKT TCR used in this study. The CDR3α loop, similar in sequence to iNKT-TCRs, engages CD1d/αGalCer in a similar position as that seen with iNKT-TCRs, however fewer actual contacts are made. Instead, the CDR1α loop contributes important contacts to CD1d/αGalCer, with an emphasis on the 4'OH of the galactose headgroup. This is consistent with the inability of Vα24- T cells to respond to α-glucosylceramide, which differs from αGalCer in the position of the 4'OH. These data illustrate how fine specificity for a lipid containing α-linked galactose is achieved by a TCR structurally distinct from that of iNKT cells.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, Illinois, United States of America.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Antigen-presenting glycoprotein CD1d
C
284Homo sapiensMutation(s): 0 
Gene Names: CD1D
Find proteins for P15813 (Homo sapiens)
Go to Gene View: CD1D
Go to UniProtKB:  P15813
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
HUMAN NKT TCR ALPHA CHAIN
A
220Homo sapiensMutation(s): 0 
Gene Names: B2M
Find proteins for K7N5M3 (Homo sapiens)
Go to Gene View: B2M
Go to UniProtKB:  K7N5M3
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
HUMAN NKT TCR BETA CHAIN
B
259Homo sapiensMutation(s): 0 
Gene Names: B2M
Find proteins for K7N5M4 (Homo sapiens)
Go to Gene View: B2M
Go to UniProtKB:  K7N5M4
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Beta-2-microglobulin
D
100Homo sapiensMutation(s): 0 
Gene Names: B2M
Find proteins for P61769 (Homo sapiens)
Go to Gene View: B2M
Go to UniProtKB:  P61769
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download SDF File 
Download CCD File 
B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
FUC
Query on FUC

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Download CCD File 
A
ALPHA-L-FUCOSE
C6 H12 O5
SHZGCJCMOBCMKK-SXUWKVJYSA-N
 Ligand Interaction
AGH
Query on AGH

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Download CCD File 
C
N-{(1S,2R,3S)-1-[(ALPHA-D-GALACTOPYRANOSYLOXY)METHYL]-2,3-DIHYDROXYHEPTADECYL}HEXACOSANAMIDE
C50 H99 N O9
VQFKFAKEUMHBLV-BYSUZVQFSA-N
 Ligand Interaction
NAG
Query on NAG

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Download CCD File 
A, B, C
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.568 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.208 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 57.112α = 90.00
b = 72.573β = 103.31
c = 113.747γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
DENZOdata reduction
PHENIXrefinement
PDB_EXTRACTdata extraction
SCALEPACKdata scaling
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-10-31
    Type: Initial release
  • Version 1.1: 2013-07-10
    Type: Database references
  • Version 1.2: 2017-11-15
    Type: Advisory, Refinement description
  • Version 1.3: 2018-01-24
    Type: Structure summary