3SDX

Crystal structure of human autoreactive-Valpha24 NKT TCR in complex with CD1d-beta-galactosylceramide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.12 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.234 

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Ligand Structure Quality Assessment 


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Literature

Recognition of beta-linked self glycolipids mediated by natural killer T cell antigen receptors

Pellicci, D.G.Clarke, A.J.Patel, O.Mallevaey, T.Beddoe, T.Le Nours, J.Uldrich, A.P.McCluskey, J.Besra, G.S.Porcelli, S.A.Gapin, L.Godfrey, D.I.Rossjohn, J.

(2011) Nat Immunol 12: 827-833

  • DOI: https://doi.org/10.1038/ni.2076
  • Primary Citation of Related Structures:  
    3SCM, 3SDA, 3SDC, 3SDD, 3SDX

  • PubMed Abstract: 

    The most potent foreign antigens for natural killer T cells (NKT cells) are α-linked glycolipids, whereas NKT cell self-reactivity involves weaker recognition of structurally distinct β-linked glycolipid antigens. Here we provide the mechanism for the autoreactivity of T cell antigen receptors (TCRs) on NKT cells to the mono- and tri-glycosylated β-linked agonists β-galactosylceramide (β-GalCer) and isoglobotrihexosylceramide (iGb3), respectively. In binding these disparate antigens, the NKT cell TCRs docked onto CD1d similarly, achieving this by flattening the conformation of the β-linked ligands regardless of the size of the glycosyl head group. Unexpectedly, the antigenicity of iGb3 was attributable to its terminal sugar group making compensatory interactions with CD1d. Thus, the NKT cell TCR molds the β-linked self ligands to resemble the conformation of foreign α-linked ligands, which shows that induced-fit molecular mimicry can underpin the self-reactivity of NKT cell TCRs to β-linked antigens.


  • Organizational Affiliation

    Department of Microbiology & Immunology, University of Melbourne, Parkville, Victoria, Australia.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Antigen-presenting glycoprotein CD1dA,
F [auth C]
275Homo sapiensMutation(s): 0 
Gene Names: CD1D
UniProt & NIH Common Fund Data Resources
Find proteins for P15813 (Homo sapiens)
Explore P15813 
Go to UniProtKB:  P15813
PHAROS:  P15813
GTEx:  ENSG00000158473 
Entity Groups  
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UniProt GroupP15813
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-2-microglobulinB,
G [auth D]
99Homo sapiensMutation(s): 0 
Gene Names: B2MCDABP0092HDCMA22P
UniProt & NIH Common Fund Data Resources
Find proteins for P61769 (Homo sapiens)
Explore P61769 
Go to UniProtKB:  P61769
PHAROS:  P61769
GTEx:  ENSG00000166710 
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UniProt GroupP61769
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
NKT TCR Valpha24 chainC [auth E],
E [auth G]
204Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P01848 (Homo sapiens)
Explore P01848 
Go to UniProtKB:  P01848
PHAROS:  P01848
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UniProt GroupP01848
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
NKT TCR autoreactive-Vbeta11 chainD [auth F],
H
247Homo sapiensMutation(s): 0 
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
GCY
Query on GCY

Download Ideal Coordinates CCD File 
I [auth A],
J [auth C]
N-[(2S,3R)-1-(beta-D-galactopyranosyloxy)-3-hydroxyoctadec-4-en-2-yl]tetracosanamide
C48 H93 N O8
POQRWMRXUOPCLD-HIIAJUEOSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.12 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.234 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 209.041α = 90
b = 152.337β = 97.24
c = 85.119γ = 90
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-10-05
    Type: Initial release