4F7E

Crystal structure of bovine CD1d with bound C16:0-alpha-galactosyl ceramide

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.223 

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Literature

Crystal Structures of Bovine CD1d Reveal Altered αGalCer Presentation and a Restricted A' Pocket Unable to Bind Long-Chain Glycolipids.

Wang, J., Guillaume, J., Pauwels, N., Van Calenbergh, S., Van Rhijn, I., Zajonc, D.M.

(2012) PLoS One 7: e47989-e47989

  • DOI: 10.1371/journal.pone.0047989
  • Primary Citation of Related Structures:  
    4F7C, 4F7E

  • PubMed Abstract: 

    • NKT cells play important roles in immune surveillance. They rapidly respond to pathogens by detecting microbial glycolipids when presented by the non-classical MHC I homolog CD1d. Previously, ruminants were considered to lack NKT cells due to the lac ...

    NKT cells play important roles in immune surveillance. They rapidly respond to pathogens by detecting microbial glycolipids when presented by the non-classical MHC I homolog CD1d. Previously, ruminants were considered to lack NKT cells due to the lack of a functional CD1D gene. However, recent data suggest that cattle express CD1d with unknown function. In an attempt to characterize the function of bovine CD1d, we assessed the lipid binding properties of recombinant Bos taurus CD1d (boCD1d) in vitro. BoCD1d is able to bind glycosphingolipids (GSLs) with fatty acid chain lengths of C₁₈, while GSLs with fatty acids of C₂₄ do not bind. Crystal structures of boCD1d bound to a short-chain C₁₂-di-sulfatide antigen, as well as short-chain C₁₆-αGalCer revealed that the Á pocket of boCD1d is restricted in size compared to that of both mouse and human CD1d, explaining the inability of long chain GSL's to bind to boCD1d. Moreover, while di-sulfatide is presented similarly compared to the presentation of sulfatide by mouse CD1d, αGalCer is presented differently at the cell surface, due to an amino acid Asp151Asn substitution that results in loss of intimate contacts between the αGalCer headgroup and CD1d. The altered αGalCer presentation by boCD1d also explains its lack of cross-activation of mouse iNKT cells and raises the interesting question of the nature and function of bovine lipid-reactive T cells.

    Organizational Affiliation: 

    Division of Cell Biology, La Jolla Institute for Allergy and Immunology, La Jolla, California, United States of America.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CD1D antigen, d polypeptideA283Bos taurusMutation(s): 0 
Gene Names: CD1D
Find proteins for A1L565 (Bos taurus)
Explore A1L565 
Go to UniProtKB:  A1L565
Protein Feature View
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  • Reference Sequence
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(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-2-microglobulinB98Bos taurusMutation(s): 0 
Gene Names: B2M
Find proteins for P01888 (Bos taurus)
Explore P01888 
Go to UniProtKB:  P01888
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 3
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
C
2 N-Glycosylation Oligosaccharides Interaction
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
0SH
Query on 0SH
Download Ideal Coordinates CCD File 
A
N-[(2S,3S,4R)-1-(alpha-D-galactopyranosyloxy)-3,4-dihydroxyoctadecan-2-yl]hexadecanamide
C40 H79 N O9
HRAAKPGXJOTHIU-WVLAUNTOSA-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
SO4
Query on SO4
Download Ideal Coordinates CCD File 
B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.223 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.785α = 90
b = 74.479β = 90
c = 122.917γ = 90
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2012-05-15 
  • Released Date: 2012-11-14 
    • Deposition Author(s): Wang, J., Zajonc, D.M.

Revision History 

  • Version 1.0: 2012-11-14
    Type: Initial release
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Database references, Derived calculations, Structure summary