1ONQ

Crystal Structure of CD1a in Complex with a Sulfatide

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.229 

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This is version 2.0 of the entry. See complete history. 


Literature

Crystal structure of CD1a in complex with a sulfatide self antigen at a resolution of 2.15 A.

Zajonc, D.M., Elsliger, M.A., Teyton, L., Wilson, I.A.

(2003) Nat Immunol 4: 808-815

  • DOI: 10.1038/ni948
  • Primary Citation of Related Structures:  
    1ONQ

  • PubMed Abstract: 

    • CD1 antigens bind a variety of self and foreign lipid and glycolipid antigens for presentation to CD1-restricted T cell receptors (TCRs). Here we report the crystal structure of human CD1a in complex with a sulfatide self antigen at a resolution of 2.15 A ...

    CD1 antigens bind a variety of self and foreign lipid and glycolipid antigens for presentation to CD1-restricted T cell receptors (TCRs). Here we report the crystal structure of human CD1a in complex with a sulfatide self antigen at a resolution of 2.15 A. The lipid adopts an S-shaped conformation, with the sphingosine chain completely buried in the A' pocket and the fatty acid chain emerging from the interface of the A' pocket into the more exposed F' pocket. The headgroup is anchored in the A'-F' junction and protrudes into the F' pocket for TCR recognition. Because the A' pocket is narrow with a fixed terminus, it can act as a molecular 'ruler' to select alkyl chains of a particular length.

    Organizational Affiliation: 

    Department of Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
T-cell surface glycoprotein CD1aA, C283Homo sapiensMutation(s): 0 
Gene Names: CD1A
UniProt & NIH Common Fund Data Resources
Find proteins for P06126 (Homo sapiens)
Explore P06126 
Go to UniProtKB:  P06126
PHAROS:  P06126
GTEx:  ENSG00000158477
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-2-microglobulinB, D99Homo sapiensMutation(s): 0 
Gene Names: B2M, CDABP0092, HDCMA22P
UniProt & NIH Common Fund Data Resources
Find proteins for P61769 (Homo sapiens)
Explore P61769 
Go to UniProtKB:  P61769
PHAROS:  P61769
GTEx:  ENSG00000166710
Protein Feature View
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 3
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseE, G, H2N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Entity ID: 4
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
alpha-L-fucopyranose-(1-6)-2-acetamido-2-deoxy-beta-D-glucopyranoseF2N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G86851RC
GlyCosmos:  G86851RC
GlyGen:  G86851RC
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SLF (Subject of Investigation/LOI)
Query on SLF
Download Ideal Coordinates CCD File 
 J [auth A], M [auth C]SULFATE-3-D-GALACTOSYL-BETA-1-1-N-STEAROYL-D-SPHINGOSINE
C42 H81 N O11 S
GQQZXRPXBDJABR-BDZNYNMQSA-N		 Ligand Interaction
NAG (Subject of Investigation/LOI)
Query on NAG
Download Ideal Coordinates CCD File 
 L [auth C]2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N		 Ligand Interaction
FUC (Subject of Investigation/LOI)
Query on FUC
Download Ideal Coordinates CCD File 
 I [auth A], K [auth C]alpha-L-fucopyranose
C6 H12 O5
SHZGCJCMOBCMKK-SXUWKVJYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.229 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.407α = 90
b = 42.711β = 90.78
c = 204.217γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-08-05
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Structure summary