4X6D

CD1a ternary complex with endogenous lipids and BK6 TCR

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.98 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.180 

wwPDB Validation   3D Report Full Report



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: 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 proto ...

    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. [3] Institute of Infection and Immunity, Cardiff University, School of Medicine, Heath Park, Cardiff, UK.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
T-cell surface glycoprotein CD1aA, C275Homo sapiensMutation(s): 2 
Gene Names: CD1A
Find proteins for P06126 (Homo sapiens)
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Go to UniProtKB:  P06126
NIH Common Fund Data Resources
PHAROS  P06126
GTEx  ENSG00000158477
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-2-microglobulinB, D99Homo sapiensMutation(s): 0 
Gene Names: B2M, CDABP0092, HDCMA22P
Find proteins for P61769 (Homo sapiens)
Explore P61769 
Go to UniProtKB:  P61769
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PHAROS  P61769
GTEx  ENSG00000166710
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
TCR alphaE, G207Homo sapiensMutation(s): 0 
Gene Names: TRAC, TCRA
Find proteins for P01848 (Homo sapiens)
Explore P01848 
Go to UniProtKB:  P01848
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PHAROS  P01848
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
TCR betaF, H245Homo sapiensMutation(s): 0 
Gene Names: TRBC1
Find proteins for P01850 (Homo sapiens)
Explore P01850 
Go to UniProtKB:  P01850
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 5
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose
I, J
3 N-Glycosylation Oligosaccharides Interaction
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
OLA
Query on OLA
Download Ideal Coordinates CCD File 
A
OLEIC ACID
C18 H34 O2
ZQPPMHVWECSIRJ-KTKRTIGZSA-N		 Ligand Interaction
PAM
Query on PAM
Download Ideal Coordinates CCD File 
C
PALMITOLEIC ACID
C16 H30 O2
SECPZKHBENQXJG-FPLPWBNLSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.98 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.180 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.133α = 90
b = 126.322β = 90
c = 226.852γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • 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 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Source and taxonomy, Structure summary