1GZP

CD1b in complex with GM2 ganglioside

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.225 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history. 


Literature

Structure of human CD1b with bound ligands at 2.3 A, a maze for alkyl chains.

Gadola, S.D., Zaccai, N.R., Harlos, K., Shepherd, D., Castro-Palomino, J.C., Ritter, G., Schmidt, R.R., Jones, E.Y., Cerundolo, V.

(2002) Nat Immunol 3: 721-726

  • DOI: 10.1038/ni821
  • Primary Citation of Related Structures:  
    1GZQ, 1GZP

  • PubMed Abstract: 

    • The human genome encodes five nonpolymorphic major histocompatibility complex class I-like glycoproteins, CD1a to CD1e, that present lipid antigens for specific recognition by T lymphocytes. Using single alkyl chain detergents, we developed a protoco ...

    The human genome encodes five nonpolymorphic major histocompatibility complex class I-like glycoproteins, CD1a to CD1e, that present lipid antigens for specific recognition by T lymphocytes. Using single alkyl chain detergents, we developed a protocol to generate recombinant human CD1b-lipid complexes. We present here the crystal structures of CD1b in complex with either phosphatidylinositol or ganglioside GM2 at 2.3 A and 2.8 A resolutions, respectively. The antigen-binding groove houses four interlinked hydrophobic channels that are occupied by the alkyl chains of the glycolipid plus two detergent molecules. A distinct exit beneath the alpha 2 helix further contributes to the plasticity of the binding groove. These structures reveal the mechanism by which two alkyl chain lipids bind to CD1b, and how CD1b can adapt to ligands of different alkyl chain length. They also suggest how very long alkyl chains, such as those of mycolic acid, could be fully contained within the binding groove. These results extend the spectrum of potential CD1b ligands by revealing that, in addition to two alkyl chain lipids, mono-alkyl and triple-alkyl chain lipids can be accommodated in the binding groove.

    Organizational Affiliation: 

    Cancer Research UK Tumour Immunology Group, The Weatherall Institute of Molecular Medicine, Nuffield Department of Medicine, University of Oxford, Oxford OX3 9DS, UK. stephan.gadola@inselch



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
T-CELL SURFACE GLYCOPROTEIN CD1BA300Homo sapiensMutation(s): 0 
Gene Names: CD1B
Find proteins for P29016 (Homo sapiens)
Explore P29016 
Go to UniProtKB:  P29016
NIH Common Fund Data Resources
PHAROS  P29016
GTEx  ENSG00000158485
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
B2-MICROGLOBULINB100Homo sapiensMutation(s): 0 
Gene Names: B2M, CDABP0092, HDCMA22P
Find proteins for P61769 (Homo sapiens)
Explore P61769 
Go to UniProtKB:  P61769
NIH Common Fund Data Resources
PHAROS  P61769
GTEx  ENSG00000166710
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GM2
Query on GM2
Download Ideal Coordinates CCD File 
A
N-[(1S,2S)-2-HYDROXY-1-({[(2R,3R,4S,5S,6R)-3,4,5-TRIHYDROXY-6-(HYDROXYMETHYL)TETRAHYDRO-2H-PYRAN-2-YL]OXY}METHYL)OCTADECYL]OCTADECANAMIDE
C43 H85 N O8
SYMIJCRAJBNLEL-YPQBUIQASA-N		 Ligand Interaction
TWT
Query on TWT
Download Ideal Coordinates CCD File 
A
DOCOSANE
C22 H46
HOWGUJZVBDQJKV-UHFFFAOYSA-N		 Ligand Interaction
D12
Query on D12
Download Ideal Coordinates CCD File 
A
DODECANE
C12 H26
SNRUBQQJIBEYMU-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.225 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.527α = 90
b = 176.885β = 90
c = 75.25γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

View Full Validation Report


View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-07-31
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-02-28
    Changes: Database references, Source and taxonomy
  • Version 1.4: 2019-05-22
    Changes: Data collection, Experimental preparation