6D64

Crystal Structure of Human CD1b in Complex with POPC


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.180 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 2.1 of the entry. See complete history


Literature

A T-cell receptor escape channel allows broad T-cell response to CD1b and membrane phospholipids.

Shahine, A.Reinink, P.Reijneveld, J.F.Gras, S.Holzheimer, M.Cheng, T.Y.Minnaard, A.J.Altman, J.D.Lenz, S.Prandi, J.Kubler-Kielb, J.Moody, D.B.Rossjohn, J.Van Rhijn, I.

(2019) Nat Commun 10: 56-56

  • DOI: https://doi.org/10.1038/s41467-018-07898-0
  • Primary Citation of Related Structures:  
    6CUG, 6CUH, 6D64

  • PubMed Abstract: 

    CD1 proteins are expressed on dendritic cells, where they display lipid antigens to T-cell receptors (TCRs). Here we describe T-cell autoreactivity towards ubiquitous human membrane phospholipids presented by CD1b. These T-cells discriminate between two major types of lipids, sphingolipids and phospholipids, but were broadly cross-reactive towards diverse phospholipids including phosphatidylcholine, phosphatidylinositol and phosphatidylethanolamine. The crystal structure of a representative TCR bound to CD1b-phosphatidylcholine provides a molecular mechanism for this promiscuous recognition. We observe a lateral escape channel in the TCR, which shunted phospholipid head groups sideways along the CD1b-TCR interface, without contacting the TCR. Instead the TCR recognition site involved the neck region phosphate that is common to all major self-phospholipids but absent in sphingolipids. Whereas prior studies have focused on foreign lipids or rare self-lipids, we define a new molecular mechanism of promiscuous recognition of common self-phospholipids including those that are known targets in human autoimmune disease.


  • Organizational Affiliation

    Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, VIC, 3800, Australia.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
T-cell surface glycoprotein CD1b300Homo sapiensMutation(s): 0 
Gene Names: CD1B
UniProt & NIH Common Fund Data Resources
Find proteins for P29016 (Homo sapiens)
Explore P29016 
Go to UniProtKB:  P29016
PHAROS:  P29016
GTEx:  ENSG00000158485 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP29016
Glycosylation
Glycosylation Sites: 3Go to GlyGen: P29016-1
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-microglobulin101Homo 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
Oligosaccharides

Help

Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-3)][alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose
C
7N-Glycosylation
Glycosylation Resources
GlyTouCan:  G11460AB
GlyCosmos:  G11460AB
GlyGen:  G11460AB
Entity ID: 4
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-L-fucopyranose-(1-3)-[2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)][alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose
D
4N-Glycosylation
Glycosylation Resources
GlyTouCan:  G63564LA
GlyCosmos:  G63564LA
Entity ID: 5
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-D-mannopyranose-(1-3)]2-acetamido-2-deoxy-beta-D-glucopyranose
E
5N-Glycosylation
Glycosylation Resources
GlyTouCan:  G32834DN
GlyCosmos:  G32834DN
GlyGen:  G32834DN
Small Molecules
Ligands 6 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
POV
Query on POV

Download Ideal Coordinates CCD File 
F [auth A](2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate
C42 H82 N O8 P
WTJKGGKOPKCXLL-PFDVCBLKSA-N
CUY
Query on CUY

Download Ideal Coordinates CCD File 
G [auth A]tetracosyl octadecanoate
C42 H84 O2
JKKQRJTZBKHHOI-UHFFFAOYSA-N
IOD
Query on IOD

Download Ideal Coordinates CCD File 
Q [auth A],
R [auth A]
IODIDE ION
I
XMBWDFGMSWQBCA-UHFFFAOYSA-M
EDO
Query on EDO

Download Ideal Coordinates CCD File 
N [auth A],
O [auth A],
T [auth B]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
CL
Query on CL

Download Ideal Coordinates CCD File 
H [auth A]
I [auth A]
J [auth A]
K [auth A]
L [auth A]
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
S [auth B]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
NA
Query on NA

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.180 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.981α = 90
b = 80.032β = 90
c = 92.766γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
iMOSFLMdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-01-16
    Type: Initial release
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary
  • Version 2.1: 2023-10-04
    Changes: Data collection, Database references, Derived calculations, Refinement description, Structure summary