4X6E

CD1a binary complex with lysophosphatidylcholine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.191 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

alpha beta T cell antigen receptor recognition of CD1a presenting self lipid ligands.

Birkinshaw, R.W.Pellicci, D.G.Cheng, T.Y.Keller, A.N.Sandoval-Romero, M.Gras, S.de Jong, A.Uldrich, A.P.Moody, D.B.Godfrey, D.I.Rossjohn, J.

(2015) Nat Immunol 16: 258-266

  • DOI: https://doi.org/10.1038/ni.3098
  • Primary Citation of Related Structures:  
    4X6B, 4X6C, 4X6D, 4X6E, 4X6F

  • PubMed Abstract: 

    A central paradigm in αβ T cell-mediated immunity is the simultaneous co-recognition of antigens and antigen-presenting molecules by the αβ T cell antigen receptor (TCR). CD1a presents a broad repertoire of lipid-based antigens. We found that a prototypical autoreactive TCR bound CD1a when it was presenting a series of permissive endogenous ligands, while other lipid ligands were nonpermissive to TCR binding. The structures of two TCR-CD1a-lipid complexes showed that the TCR docked over the A' roof of CD1a in a manner that precluded direct contact with permissive ligands. Nonpermissive ligands indirectly inhibited TCR binding by disrupting the TCR-CD1a contact zone. The exclusive recognition of CD1a by the TCR represents a previously unknown mechanism whereby αβ T cells indirectly sense self antigens that are bound to an antigen-presenting molecule.


  • Organizational Affiliation

    1] Department of Biochemistry and Molecular Biology, School of Biomedical Sciences, Monash University, Clayton, Australia. [2] ARC Centre of Excellence in Advanced Molecular Imaging, Monash University, Clayton, Australia.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
T-cell surface glycoprotein CD1a281Homo sapiensMutation(s): 2 
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 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP06126
Sequence Annotations
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-2-microglobulin105Homo sapiensMutation(s): 0 
Gene Names: B2MCDABP0092HDCMA22P
UniProt & NIH Common Fund Data Resources
Find proteins for P61769 (Homo sapiens)
Explore P61769 
Go to UniProtKB:  P61769
PHAROS:  P61769
GTEx:  ENSG00000166710 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP61769
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
42H
Query on 42H

Download Ideal Coordinates CCD File 
D [auth A](4R,7R,18Z)-4,7-dihydroxy-N,N,N-trimethyl-10-oxo-3,5,9-trioxa-4-phosphaheptacos-18-en-1-aminium 4-oxide
C26 H53 N O7 P
YAMUFBLWGFFICM-PTGWMXDISA-O
MLT
Query on MLT

Download Ideal Coordinates CCD File 
C [auth A]D-MALATE
C4 H6 O5
BJEPYKJPYRNKOW-UWTATZPHSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.191 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.299α = 90
b = 90.663β = 90
c = 108.066γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
iMOSFLMdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-01-28
    Type: Initial release
  • Version 1.1: 2015-02-18
    Changes: Database references
  • Version 1.2: 2015-02-25
    Changes: Database references
  • Version 1.3: 2015-03-04
    Changes: Structure summary
  • Version 1.4: 2023-09-27
    Changes: Data collection, Database references, Derived calculations, Refinement description, Source and taxonomy