3UBX

Crystal structure of the mouse CD1d-C20:2-aGalCer-L363 mAb Fab complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.202 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural basis for the recognition of C20:2-alpha GalCer by the invariant natural killer T cell receptor-like antibody L363.

Yu, E.D.Girardi, E.Wang, J.Mac, T.T.Yu, K.O.Van Calenbergh, S.Porcelli, S.A.Zajonc, D.M.

(2012) J.Biol.Chem. 287: 1269-1278

  • DOI: 10.1074/jbc.M111.308783

  • PubMed Abstract: 
  • Natural killer T (NKT) cells express a semi-invariant Vα14 T cell receptor (TCR) and recognize structurally diverse antigens presented by the antigen-presenting molecule CD1d that range from phosphoglycerolipids to α- and β-anomeric glycosphingolipid ...

    Natural killer T (NKT) cells express a semi-invariant Vα14 T cell receptor (TCR) and recognize structurally diverse antigens presented by the antigen-presenting molecule CD1d that range from phosphoglycerolipids to α- and β-anomeric glycosphingolipids, as well as microbial α-glycosyl diacylglycerolipids. Recently developed antibodies that are specific for the complex of the prototypical invariant NKT (iNKT) cell antigen αGalCer (KRN7000) bound to mouse CD1d have become valuable tools in elucidating the mechanism of antigen loading and presentation. Here, we report the 3.1 Å resolution crystal structure of the Fab of one of these antibodies, L363, bound to mCD1d complexed with the αGalCer analog C20:2, revealing that L363 is an iNKT TCR-like antibody that binds CD1d-presented αGalCer in a manner similar to the TCR. The structure reveals that L363 depends on both the L and H chains for binding to the glycolipid-mCD1d complex, although only the L chain is involved in contacts with the glycolipid antigen. The H chain of L363 features residue Trp-104, which mimics the TCR CDR3α residue Leu-99, which is crucial for CD1d binding. We characterized the antigen-specificity of L363 toward several different glycolipids, demonstrating that whereas the TCR can induce structural changes in both antigen and CD1d to recognize disparate lipid antigens, the antibody L363 can only induce the F' roof formation in CD1d but fails to reorient the glycolipid headgroup necessary for binding. In summary, L363 is a powerful tool to study mechanism of iNKT cell activation for structural analogs of KRN7000, and our study can aid in the design of antibodies with altered antigen specificity.


    Organizational Affiliation

    Division of Cell Biology, La Jolla Institute for Allergy & Immunology, La Jolla, California 92037, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Antigen-presenting glycoprotein CD1d1
A, D
286Mus musculusMutation(s): 0 
Gene Names: Cd1d1 (Cd1.1)
Find proteins for P11609 (Mus musculus)
Go to UniProtKB:  P11609
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Beta-2-microglobulin
B, E
99Mus musculusMutation(s): 0 
Gene Names: B2m
Find proteins for P01887 (Mus musculus)
Go to UniProtKB:  P01887
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
L363 light chain (IGKV13-84*01)
L, I
214N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
L363 heavy chain (IGHV9-4*02)
H, G
222N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
09N
Query on 09N

Download SDF File 
Download CCD File 
A, D
(11Z,14Z)-N-[(2S,3S,4R)-1-(alpha-D-galactopyranosyloxy)-3,4-dihydroxyoctadecan-2-yl]icosa-11,14-dienamide
C20:2-alpha-galactosylceramide
C44 H83 N O9
WSXMIFGRYXQZQZ-ULOPOQRHSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A, D
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
09NKd: 25.2 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.202 
  • Space Group: P 63
Unit Cell:
Length (Å)Angle (°)
a = 234.948α = 90.00
b = 234.948β = 90.00
c = 99.172γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
DENZOdata reduction
MOLREPphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2011-10-25 
  • Released Date: 2011-11-16 
  • Deposition Author(s): Yu, E.D., Zajonc, D.M.

Revision History 

  • Version 1.0: 2011-11-16
    Type: Initial release
  • Version 1.1: 2013-08-28
    Type: Database references