Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 4-mer - A1B1C1D1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration, native gel electrophoresis

Macromolecule Content

• Total Structure Weight: 99.16 kDa 
• Atom Count: 6732 
• Residue Count: 810 
• Unique protein chains: 4

5WKI

Crystal structure of PG90 TCR-CD1b-PG complex

• DOI: 10.2210/pdb5WKI/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Homo sapiens
• Expression System: Trichoplusia ni, Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2017-07-25 Released: 2017-11-01 
• Deposition Author(s): Shahine, A., Gras, S., Rossjohn, J.

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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 

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

• PubMed: 29054999 
• DOI: 10.1126/sciimmunol.aao1384
• Primary Citation of Related Structures:  
  5WKE, 5WKG, 5WJO, 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.

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Organizational Affiliation: 

Institute of Infection and Immunity, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, UK.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
T-cell surface glycoprotein CD1b	A	300	Homo sapiens	Mutation(s): 0  Gene Names: CD1B
Find proteins for P29016 (Homo sapiens) Explore P29016  Go to UniProtKB:  P29016
NIH Common Fund Data Resources
PHAROS  P29016 GTEx  ENSG00000158485

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Beta-2-microglobulin	B	99	Homo sapiens	Mutation(s): 0  Gene Names: B2M, CDABP0092, HDCMA22P
Find proteins for P61769 (Homo sapiens) Explore P61769  Go to UniProtKB:  P61769
NIH Common Fund Data Resources
PHAROS  P61769 GTEx  ENSG00000166710

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
T-cell receptor alpha variable 26-1,TRA@ protein	D	204	Homo sapiens	Mutation(s): 0  Gene Names: TRAV26-1
Find proteins for A0A087WT03 (Homo sapiens) Explore A0A087WT03  Go to UniProtKB:  A0A087WT03
NIH Common Fund Data Resources
PHAROS  A0A087WT03 GTEx  ENSG00000211807
Find proteins for Q6P4G7 (Homo sapiens) Explore Q6P4G7  Go to UniProtKB:  Q6P4G7

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
PG90 TCR beta chain	E	249	Homo sapiens	Mutation(s): 0

Oligosaccharides

Help

Entity ID: 5
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
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	C	4		N-Glycosylation

Small Molecules

Ligands 7 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
D3D	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	A	tetracosyl octadecanoate C42 H84 O2 JKKQRJTZBKHHOI-UHFFFAOYSA-N
NAG	A	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N
EDO	A, B, D	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N
ACT	E	ACETATE ION C2 H3 O2 QTBSBXVTEAMEQO-UHFFFAOYSA-M
CL	E	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M
NA	D, 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 = 152.01	α = 90
b = 82.97	β = 94.88
c = 90.16	γ = 90

Software Package:

Software Name	Purpose
BUSTER	refinement
iMOSFLM	data reduction
Aimless	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2017-07-25 
• Released Date: 2017-11-01 
Deposition Author(s): Shahine, A., Gras, S., Rossjohn, J.

Revision History 

• 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