3O8X

Recognition of Glycolipid Antigen by iNKT Cell TCR

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.74 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.198 

wwPDB Validation   3D Report Full Report



Literature

The V{alpha}14 invariant natural killer T cell TCR forces microbial glycolipids and CD1d into a conserved binding mode.

Li, Y., Girardi, E., Wang, J., Yu, E.D., Painter, G.F., Kronenberg, M., Zajonc, D.M.

(2010) J Exp Med 

  • DOI: 10.1084/jem.20101335
  • Primary Citation of Related Structures:  
    3O8X, 3O9W

  • PubMed Abstract: 

    • Invariant natural killer T cells (iNKT cells) rapidly produce effector cytokines. In this study, we report the first crystal structures of the iNKT cell T cell receptor (TCR) bound to two natural, microbial glycolipids presented by CD1d. Binding of t ...

    Invariant natural killer T cells (iNKT cells) rapidly produce effector cytokines. In this study, we report the first crystal structures of the iNKT cell T cell receptor (TCR) bound to two natural, microbial glycolipids presented by CD1d. Binding of the TCR induced CDR3-α-dependent structural changes in the F' roof of CD1d; these changes resemble those occurring in the absence of TCR engagement when the highly potent synthetic antigen α-galactosylceramide (α-GalCer) binds CD1d. Furthermore, in the Borrelia burgdorferi α-galactosyl diacylglycerol-CD1d complex, TCR binding caused a marked repositioning of the galactose sugar into an orientation that closely resembles α-GalCer. The TCR-dependent reorientation of the sugar, together with the induced CD1d fit, may explain the weaker potency of the microbial antigens compared with α-GalCer. We propose that the TCR of iNKT cells binds with a conserved footprint onto CD1d, regardless of the bound glycolipid antigen, and that for microbial antigens this unique binding mode requires TCR-initiated conformational changes.

    Organizational Affiliation: 

    Division of Cell Biology, La Jolla Institute for Allergy and Immunology, La Jolla, CA 92037, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Antigen-presenting glycoprotein CD1d1A285Mus musculusMutation(s): 1 
Gene Names: Cd1d1, Cd1.1
Find proteins for P11609 (Mus musculus)
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Go to UniProtKB:  P11609
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-2-microglobulinB99Mus musculusMutation(s): 0 
Gene Names: B2m
Find proteins for P01887 (Mus musculus)
Explore P01887 
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NIH Common Fund Data Resources
IMPC  MGI:88127
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Valpha14 chimera (Mouse variable domain, Human T-cell receptor alpha chain C region constant domain)C209Mus musculus, Homo sapiens
This entity is chimeric		Mutation(s): 1 
Gene Names: TRAC, TCRA
Find proteins for P01848 (Homo sapiens)
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PHAROS  P01848
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Vbeta8.2 chimera (Mouse variable domain, Human T-cell receptor beta-2 chain C region constant domain)D241Mus musculus, Homo sapiens
This entity is chimeric		Mutation(s): 2 
Gene Names: TRBC2, TCRBC2
Find proteins for A0A5B9 (Homo sapiens)
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Go to UniProtKB:  A0A5B9
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PHAROS  A0A5B9
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 5
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
E
2 N-Glycosylation Oligosaccharides Interaction
Entity ID: 6
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose
F
3 N-Glycosylation Oligosaccharides Interaction
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GSL
Query on GSL
Download Ideal Coordinates CCD File 
A
(2S,3R)-3-HYDROXY-2-(TETRADECANOYLAMINO)OCTADECYL ALPHA-D-GALACTOPYRANOSIDURONIC ACID
C38 H73 N O9
IRPOZWRRAFKYMQ-LMIAXWKISA-N		 Ligand Interaction
NAG
Query on NAG
Download Ideal Coordinates CCD File 
A
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N		 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
TCRKd :  690   nM  PDBBind
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.74 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.198 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79α = 90
b = 191.2β = 90
c = 151.2γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
MOLREPphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

  • Deposited Date: 2010-08-03 
  • Released Date: 2010-09-29 
    • Deposition Author(s): Zajonc, D.M., Li, Y.

Revision History 

  • Version 1.0: 2010-09-29
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-06-21
    Changes: Database references, Source and taxonomy, Structure summary
  • Version 1.3: 2017-06-28
    Changes: Source and taxonomy
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary