2PO6

Crystal structure of CD1d-lipid-antigen complexed with Beta-2-Microglobulin, NKT15 Alpha-Chain and NKT15 Beta-Chain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.229 

Starting Models: experimental
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This is version 2.2 of the entry. See complete history


Literature

CD1d-lipid-antigen recognition by the semi-invariant NKT T-cell receptor.

Borg, N.A.Wun, K.S.Kjer-Nielsen, L.Wilce, M.C.Pellicci, D.G.Koh, R.Besra, G.S.Bharadwaj, M.Godfrey, D.I.McCluskey, J.Rossjohn, J.

(2007) Nature 448: 44-49

  • DOI: https://doi.org/10.1038/nature05907
  • Primary Citation of Related Structures:  
    2PO6

  • PubMed Abstract: 

    The CD1 family is a large cluster of non-polymorphic, major histocompatibility complex (MHC) class-I-like molecules that bind distinct lipid-based antigens that are recognized by T cells. The most studied group of T cells that interact with lipid antigens are natural killer T (NKT) cells, which characteristically express a semi-invariant T-cell receptor (NKT TCR) that specifically recognizes the CD1 family member, CD1d. NKT-cell-mediated recognition of the CD1d-antigen complex has been implicated in microbial immunity, tumour immunity, autoimmunity and allergy. Here we describe the structure of a human NKT TCR in complex with CD1d bound to the potent NKT-cell agonist alpha-galactosylceramide, the archetypal CD1d-restricted glycolipid. In contrast to T-cell receptor-peptide-antigen-MHC complexes, the NKT TCR docked parallel to, and at the extreme end of the CD1d-binding cleft, which enables a lock-and-key type interaction with the lipid antigen. The structure provides a basis for the interaction between the highly conserved NKT TCR alpha-chain and the CD1d-antigen complex that is typified in innate immunity, and also indicates how variability of the NKT TCR beta-chain can impact on recognition of other CD1d-antigen complexes. These findings provide direct insight into how a T-cell receptor recognizes a lipid-antigen-presenting molecule of the immune system.


  • Organizational Affiliation

    The Protein Crystallography Unit, ARC Centre of Excellence in Structural and Functional Microbial Genomics, Department of Biochemistry and Molecular Biology, School of Biomedical Sciences, Monash University, Clayton, Victoria 3800, Australia.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
T-cell surface glycoprotein CD1d
A, E
278Homo sapiensMutation(s): 0 
Gene Names: CD1D
UniProt & NIH Common Fund Data Resources
Find proteins for P15813 (Homo sapiens)
Explore P15813 
Go to UniProtKB:  P15813
PHAROS:  P15813
GTEx:  ENSG00000158473 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP15813
Glycosylation
Glycosylation Sites: 2Go to GlyGen: P15813-1
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-2-microglobulin
B, F
99Homo sapiensMutation(s): 0 
Gene Names: B2M
UniProt & NIH Common Fund Data Resources
Find proteins for P61769 (Homo sapiens)
Explore P61769 
Go to UniProtKB:  P61769
PHAROS:  P61769
GTEx:  ENSG00000166710 
Entity Groups  
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UniProt GroupP61769
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
NKT15 alpha-chain
C, G
204Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P01848 (Homo sapiens)
Explore P01848 
Go to UniProtKB:  P01848
PHAROS:  P01848
Entity Groups  
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UniProt GroupP01848
Sequence Annotations
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
NKT15 beta-chain
D, H
244Homo sapiensMutation(s): 0 
Entity Groups  
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 5
MoleculeChains Length2D Diagram Glycosylation3D Interactions
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
I
2N/A
Glycosylation Resources
GlyTouCan:  G90333CG
GlyCosmos:  G90333CG
GlyGen:  G90333CG
Entity ID: 6
MoleculeChains Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
J
2N-Glycosylation
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.229 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 204.012α = 90
b = 155.636β = 94.78
c = 85.981γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
MOSFLMdata reduction
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

  • Released Date: 2007-07-03 
  • Deposition Author(s): Borg, N.A.

Revision History  (Full details and data files)

  • Version 1.0: 2007-07-03
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2014-10-29
    Changes: Atomic model
  • Version 1.4: 2017-10-18
    Changes: Refinement description
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Source and taxonomy, Structure summary
  • Version 2.1: 2023-08-30
    Changes: Data collection, Database references, Refinement description, Structure summary
  • Version 2.2: 2024-03-13
    Changes: Source and taxonomy, Structure summary