6C15

CD1c in complex with phosphatidylcholine

  • Classification: IMMUNE SYSTEM
  • Organism(s): Homo sapiens
  • Expression System: Homo sapiens
  • Mutation(s): No 

  • Deposited: 2018-01-03 Released: 2018-03-21 
  • Deposition Author(s): Wun, K.S., Rossjohn, J.
  • Funding Organization(s): National Health and Medical Research Council (NHMRC, Australia), Australian Research Council (ARC)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.21 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.210 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.5 of the entry. See complete history


Literature

T cell autoreactivity directed toward CD1c itself rather than toward carried self lipids.

Wun, K.S.Reijneveld, J.F.Cheng, T.Y.Ladell, K.Uldrich, A.P.Le Nours, J.Miners, K.L.McLaren, J.E.Grant, E.J.Haigh, O.L.Watkins, T.S.Suliman, S.Iwany, S.Jimenez, J.Calderon, R.Tamara, K.L.Leon, S.R.Murray, M.B.Mayfield, J.A.Altman, J.D.Purcell, A.W.Miles, J.J.Godfrey, D.I.Gras, S.Price, D.A.Van Rhijn, I.Moody, D.B.Rossjohn, J.

(2018) Nat Immunol 19: 397-406

  • DOI: https://doi.org/10.1038/s41590-018-0065-7
  • Primary Citation of Related Structures:  
    6C09, 6C15

  • PubMed Abstract: 

    The hallmark function of αβ T cell antigen receptors (TCRs) involves the highly specific co-recognition of a major histocompatibility complex molecule and its carried peptide. However, the molecular basis of the interactions of TCRs with the lipid antigen-presenting molecule CD1c is unknown. We identified frequent staining of human T cells with CD1c tetramers across numerous subjects. Whereas TCRs typically show high specificity for antigen, both tetramer binding and autoreactivity occurred with CD1c in complex with numerous, chemically diverse self lipids. Such extreme polyspecificity was attributable to binding of the TCR over the closed surface of CD1c, with the TCR covering the portal where lipids normally protrude. The TCR essentially failed to contact lipids because they were fully seated within CD1c. These data demonstrate the sequestration of lipids within CD1c as a mechanism of autoreactivity and point to small lipid size as a determinant of autoreactive T cell responses.


  • Organizational Affiliation

    Infection and Immunity Program and The Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
T-cell surface glycoprotein CD1c287Homo sapiensMutation(s): 0 
Gene Names: CD1C
UniProt & NIH Common Fund Data Resources
Find proteins for P29017 (Homo sapiens)
Explore P29017 
Go to UniProtKB:  P29017
PHAROS:  P29017
GTEx:  ENSG00000158481 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP29017
Glycosylation
Glycosylation Sites: 3Go to GlyGen: P29017-1
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-2-microglobulin108Homo 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 8 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
6PL
Query on 6PL

Download Ideal Coordinates CCD File 
G [auth A](4S,7R)-4-HYDROXY-N,N,N-TRIMETHYL-9-OXO-7-[(PALMITOYLOXY)METHYL]-3,5,8-TRIOXA-4-PHOSPHAHEXACOSAN-1-AMINIUM 4-OXIDE
C42 H85 N O8 P
PZNPLUBHRSSFHT-RRHRGVEJSA-O
NAG
Query on NAG

Download Ideal Coordinates CCD File 
C [auth A],
D [auth A],
E [auth A]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
MES
Query on MES

Download Ideal Coordinates CCD File 
L [auth A]2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N
D12
Query on D12

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F [auth A]DODECANE
C12 H26
SNRUBQQJIBEYMU-UHFFFAOYSA-N
SO4
Query on SO4

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I [auth A]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
BME
Query on BME

Download Ideal Coordinates CCD File 
J [auth A]BETA-MERCAPTOETHANOL
C2 H6 O S
DGVVWUTYPXICAM-UHFFFAOYSA-N
EDO
Query on EDO

Download Ideal Coordinates CCD File 
K [auth A]1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
NA
Query on NA

Download Ideal Coordinates CCD File 
H [auth A]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.21 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.210 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 84.255α = 90
b = 84.255β = 90
c = 366.833γ = 120
Software Package:
Software NamePurpose
BUSTERrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Health and Medical Research Council (NHMRC, Australia)Australia--
Australian Research Council (ARC)Australia--

Revision History  (Full details and data files)

  • Version 1.0: 2018-03-21
    Type: Initial release
  • Version 1.1: 2018-03-28
    Changes: Data collection, Database references
  • Version 1.2: 2018-04-04
    Changes: Data collection, Database references
  • Version 1.3: 2020-01-01
    Changes: Author supporting evidence
  • Version 1.4: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary
  • Version 1.5: 2023-10-04
    Changes: Data collection, Database references, Refinement description, Structure summary