2Q7Y

Structure of the endogenous iNKT cell ligand iGb3 bound to mCD1d


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.200 

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Ligand Structure Quality Assessment 


This is version 2.0 of the entry. See complete history


Literature

Crystal Structures of Mouse CD1d-iGb3 Complex and its Cognate Valpha14 T Cell Receptor Suggest a Model for Dual Recognition of Foreign and Self Glycolipids.

Zajonc, D.M.Savage, P.B.Bendelac, A.Wilson, I.A.Teyton, L.

(2008) J Mol Biol 377: 1104-1116

  • DOI: 10.1016/j.jmb.2008.01.061
  • Primary Citation of Related Structures:  
    2Q7Y, 2Q86

  • PubMed Abstract: 
  • The semi-invariant Valpha14Jalpha18 T cell receptor (TCR) is expressed by regulatory NKT cells and has the unique ability to recognize chemically diverse ligands presented by CD1d. The crystal structure of CD1d complexed to a natural, endogenous ligand, isoglobotrihexosylceramide (iGb3), illustrates the extent of this diversity when compared to the binding of potent, exogenous ligands, such as alpha-galactosylceramide (alpha-GalCer) ...

    The semi-invariant Valpha14Jalpha18 T cell receptor (TCR) is expressed by regulatory NKT cells and has the unique ability to recognize chemically diverse ligands presented by CD1d. The crystal structure of CD1d complexed to a natural, endogenous ligand, isoglobotrihexosylceramide (iGb3), illustrates the extent of this diversity when compared to the binding of potent, exogenous ligands, such as alpha-galactosylceramide (alpha-GalCer). A single mode of recognition for these two classes of ligands would then appear problematic for a single T cell receptor. However, the Valpha14 TCR adopts two different conformations in the crystal where, in one configuration, the presence of a larger cavity between the two CDR3 regions could accommodate iGb3 and, in the other, a smaller cavity fits alpha-GalCer more snugly. Alternatively, the extended iGb3 headgroup could be "squashed" upon docking of the TCR and accommodated between the CD1 and TCR surfaces. Thus, the same TCR may adopt alternative modes of recognition for these foreign and self-ligands for NKT cell activation.


    Organizational Affiliation

    Department of Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Rd., La Jolla, CA 92037, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
T-cell surface glycoprotein CD1d1A, C285Mus musculusMutation(s): 0 
Gene Names: Cd1d1Cd1.1
UniProt
Find proteins for P11609 (Mus musculus)
Explore P11609 
Go to UniProtKB:  P11609
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP11609
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-2-microglobulinB, D99Mus musculusMutation(s): 1 
Gene Names: B2m
UniProt & NIH Common Fund Data Resources
Find proteins for P01887 (Mus musculus)
Explore P01887 
Go to UniProtKB:  P01887
IMPC:  MGI:88127
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP01887
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 3
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseE, G 2N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Entity ID: 4
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseF 5N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G22768VO
GlyCosmos:  G22768VO
GlyGen:  G22768VO
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
IGC
Query on IGC

Download Ideal Coordinates CCD File 
I [auth A],
M [auth C]
N-[(1S,2R,3E)-1-({[ALPHA-D-GALACTOPYRANOSYL-(1->3)-BETA-D-GALACTOPYRANOSYL-(1->4)-BETA-D-GLUCOPYRANOSYL]OXY}METHYL)-2-H YDROXYHEPTADEC-3-EN-1-YL]OCTANAMIDE
C44 H81 N O18
RWHPBLFPAUXKDB-WOYQYECOSA-N
 Ligand Interaction
PLM
Query on PLM

Download Ideal Coordinates CCD File 
J [auth A],
N [auth C]
PALMITIC ACID
C16 H32 O2
IPCSVZSSVZVIGE-UHFFFAOYSA-N
 Ligand Interaction
NAG
Query on NAG

Download Ideal Coordinates CCD File 
H [auth A],
K [auth C],
L [auth C]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
IGC PDBBind:  2Q7Y Kd: 5.00e+4 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.200 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 58.941α = 90
b = 96.224β = 106.23
c = 77.926γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling
AMoREphasing

Structure Validation

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Ligand Structure Quality Assessment 



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-04-01
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Structure summary