5WKI

Crystal structure of PG90 TCR-CD1b-PG complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.214 

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Ligand Structure Quality Assessment 


This is version 2.0 of the entry. See complete history


Literature

A molecular basis of human T cell receptor autoreactivity toward self-phospholipids.

Shahine, A.Van Rhijn, I.Cheng, T.Y.Iwany, S.Gras, S.Moody, D.B.Rossjohn, J.

(2017) Sci Immunol 2

  • DOI: https://doi.org/10.1126/sciimmunol.aao1384
  • Primary Citation of Related Structures:  
    5WJO, 5WKE, 5WKG, 5WKI, 5WL1

  • PubMed Abstract: 

    Human T cell autoreactivity toward lipid antigens presented by CD1 proteins can manifest in numerous diseases, including psoriasis, contact hypersensitivities, and allergies. However, the molecular mechanisms for regulating T cell autoreactivity toward lipid antigens remain unclear. We determined the basis for T cell receptor (TCR) autoreactivity toward CD1b bound to self-phospholipids. The spectrum of self-antigens captured by CD1b skews toward abundant membrane phospholipids such as phosphatidylcholine and phosphatidylethanolamine. However, TCRs can specifically recognize rare phospholipids, including phosphatidylglycerol (PG). The structure of an autoreactive TCR bound to CD1b-PG shows that discrimination occurs through a marked induced fit movement of PG so that its polar head group fits snugly into the cationic cup of the TCR. Conversely, TCR binding toward ubiquitous self-phospholipids was sterically or electrostatically repelled. Accordingly, we describe a mechanism of TCR autoreactivity toward rare phospholipids and avoidance of autoreactivity to the most abundant self-phospholipids.


  • Organizational Affiliation

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


Macromolecules
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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: 2Go to GlyGen: P29016-1
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-2-microglobulin99Homo 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
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
T-cell receptor alpha variable 26-1,TRA@ proteinC [auth D]204Homo sapiensMutation(s): 0 
Gene Names: TRAV26-1TRA@
UniProt & NIH Common Fund Data Resources
Find proteins for A0A087WT03 (Homo sapiens)
Explore A0A087WT03 
Go to UniProtKB:  A0A087WT03
PHAROS:  A0A087WT03
GTEx:  ENSG00000211807 
Find proteins for Q6P4G7 (Homo sapiens)
Explore Q6P4G7 
Go to UniProtKB:  Q6P4G7
Entity Groups  
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UniProt GroupsA0A087WT03Q6P4G7
Sequence Annotations
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
PG90 TCR beta chainD [auth E]249Homo sapiensMutation(s): 0 
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 5
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-glucopyranoseE [auth C]4N-Glycosylation
Glycosylation Resources
GlyTouCan:  G63564LA
GlyCosmos:  G63564LA
Small Molecules
Ligands 7 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
D3D
Query on D3D

Download Ideal Coordinates CCD File 
U [auth D](19S,22R,25R)-22,25,26-trihydroxy-16,22-dioxo-17,21,23-trioxa-22lambda~5~-phosphahexacosan-19-yl (9E)-octadec-9-enoate
C40 H77 O10 P
PAZGBAOHGQRCBP-UCZVXENKSA-N
CUY
Query on CUY

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F [auth A]tetracosyl octadecanoate
C42 H84 O2
JKKQRJTZBKHHOI-UHFFFAOYSA-N
NAG
Query on NAG

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G [auth A]2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
EDO
Query on EDO

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 B],
N [auth D],
O [auth D],
P [auth D],
Q [auth D],
R [auth D],
S [auth D]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
ACT
Query on ACT

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V [auth E],
W [auth E]
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
CL
Query on CL

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Y [auth E]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
NA
Query on NA

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T [auth D],
X [auth E]
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.214 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 152.01α = 90
b = 82.97β = 94.88
c = 90.16γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement
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: 2017-11-01
    Type: Initial release
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary