3UBX

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.203 

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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
  • Primary Citation of Related Structures:  
    3UBX

  • 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 glycosphingolipids, as well as microbial α-glycosyl diacylglycerolipids ...

    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
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Antigen-presenting glycoprotein CD1d1A,
C [auth D]
286Mus musculusMutation(s): 0 
Gene Names: Cd1.1CD1dCd1d1
UniProt
Find proteins for P11609 (Mus musculus)
Explore P11609 
Go to UniProtKB:  P11609
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UniProt GroupP11609
Protein Feature View
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-2-microglobulinB,
D [auth E]
99Mus musculusMutation(s): 0 
Gene Names: B2mCD1d
UniProt & NIH Common Fund Data Resources
Find proteins for P01887 (Mus musculus)
Explore P01887 
Go to UniProtKB:  P01887
IMPC:  MGI:88127
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UniProt GroupP01887
Protein Feature View
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
L363 light chain (IGKV13-84*01)G [auth I],
E [auth L]
214Mus musculusMutation(s): 0 
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
L363 heavy chain (IGHV9-4*02)H [auth G],
F [auth H]
222Mus musculusMutation(s): 0 
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Oligosaccharides

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Entity ID: 5
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseI [auth C],
J [auth F]
2N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
09N
Query on 09N

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

Download Ideal Coordinates CCD File 
L [auth A],
N [auth D]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
09N PDBBind:  3UBX Kd: 25.2 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.203 
  • Space Group: P 63
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 234.948α = 90
b = 234.948β = 90
c = 99.172γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
MOLREPphasing
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 



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  (Full details and data files)

  • Version 1.0: 2011-11-16
    Type: Initial release
  • Version 1.1: 2013-08-28
    Changes: Database references
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Database references, Derived calculations, Source and taxonomy, Structure summary