6CXE

Structure of alpha-GSA[26,6P] bound by CD1d and in complex with the Va14Vb8.2 TCR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.209 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

A molecular switch in mouse CD1d modulates natural killer T cell activation by alpha-galactosylsphingamides.

Wang, J.Guillaume, J.Janssens, J.Remesh, S.G.Ying, G.Bitra, A.Van Calenbergh, S.Zajonc, D.M.

(2019) J.Biol.Chem. 294: 14345-14356

  • DOI: 10.1074/jbc.RA119.009963
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Type I Natural Killer T (NKT) cells are a population of innate like T lymphocytes that rapidly respond to α-GalCer presented by CD1d, via the production of both pro and anti-inflammatory cytokines. While developing novel α-GalCer analogs that were me ...

    Type I Natural Killer T (NKT) cells are a population of innate like T lymphocytes that rapidly respond to α-GalCer presented by CD1d, via the production of both pro and anti-inflammatory cytokines. While developing novel α-GalCer analogs that were meant to be utilized as potential adjuvants due to their production of pro-inflammatory cytokines  (Th1 skewers), we generated α-galactosylsphingamides (α-GSA). Surprisingly, α-GSAs are not potent antigens in vivodespite their strong T-cell receptor (TCR)-binding affinities. Here, using surface plasmon resonance (SPR), antigen presentation assays, and X-ray crystallography (yielding crystal structures of 19 different binary [CD1d-glycolipid] or ternary [CD1d-glycolipid-TCR] complexes at resolutions between 1.67 and 2.85 Å), we characterized the biochemical and structural details of α-GSA recognition by murine NKT cells. We identified a molecular switch within murine (m)CD1d that modulates NKT cell activation by α-GSAs. We found that the molecular switch involves a hydrogen bond interaction between Tyr-73 of mCD1d and the amide group oxygen of α-GSAs. We further established that the length of the acyl chain controls the positioning of the amide group with respect to the molecular switch and works synergistically with Tyr-73 to control NKT cell activity. In conclusion, our findings reveal important mechanistic insights into the presentation and recognition of glycolipids with polar moieties in an otherwise apolar milieu.These observations may inform the development α-GSAs as specific NKT cell antagonists to modulate immune responses.


    Organizational Affiliation

    La Jolla Institute for Immunology, United States.,LJI.,UGhent, Belgium.,Cancer Immunology Discovery, La Jolla Institute for Immunology, United States.,La Jolla Institute for Allergy and Immunology, United States.,Ghent University, Belgium.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Chimeric T cell antigen receptor alpha chain Va14,Va24,Ja18
C
209N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Chimeric T cell antigen receptor beta chain Vb8.2, vb11
D
241N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Antigen-presenting glycoprotein CD1d1
A
285Mus musculusMutation(s): 0 
Gene Names: Cd1d1 (Cd1.1)
Find proteins for P11609 (Mus musculus)
Go to UniProtKB:  P11609
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Beta-2-microglobulin
B
99Mus musculusMutation(s): 0 
Gene Names: B2m
Find proteins for P01887 (Mus musculus)
Go to UniProtKB:  P01887
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EM4
Query on EM4

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Download CCD File 
A
N-[(2S,3S,4R)-3,4-dihydroxy-8-oxo-8-[(6-phenylhexyl)amino]-1-{[(2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl]oxy}octan-2-yl]hexacosanamide
aGSA[26,6P]
C52 H94 N2 O10
CDZMLEFFZGLIAZ-PWIBDSRESA-N
 Ligand Interaction
NA
Query on NA

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Download CCD File 
A, C, D
SODIUM ION
Na
FKNQFGJONOIPTF-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
NAG
Query on NAG

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.209 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 78.437α = 90.00
b = 189.071β = 90.00
c = 150.908γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling
PHASERphasing
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2018-04-02 
  • Released Date: 2019-04-10 
  • Deposition Author(s): Wang, J., Zajonc, D.

Revision History 

  • Version 1.0: 2019-04-10
    Type: Initial release
  • Version 1.1: 2019-10-16
    Type: Data collection, Database references