4MD4

Immune Receptor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.165 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

A molecular basis for the association of the HLA-DRB1 locus, citrullination, and rheumatoid arthritis.

Scally, S.W.Petersen, J.Law, S.C.Dudek, N.L.Nel, H.J.Loh, K.L.Wijeyewickrema, L.C.Eckle, S.B.van Heemst, J.Pike, R.N.McCluskey, J.Toes, R.E.La Gruta, N.L.Purcell, A.W.Reid, H.H.Thomas, R.Rossjohn, J.

(2013) J.Exp.Med. 210: 2569-2582

  • DOI: 10.1084/jem.20131241
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Rheumatoid arthritis (RA) is strongly associated with the human leukocyte antigen (HLA)-DRB1 locus that possesses the shared susceptibility epitope (SE) and the citrullination of self-antigens. We show how citrullinated aggrecan and vimentin epitopes ...

    Rheumatoid arthritis (RA) is strongly associated with the human leukocyte antigen (HLA)-DRB1 locus that possesses the shared susceptibility epitope (SE) and the citrullination of self-antigens. We show how citrullinated aggrecan and vimentin epitopes bind to HLA-DRB1*04:01/04. Citrulline was accommodated within the electropositive P4 pocket of HLA-DRB1*04:01/04, whereas the electronegative P4 pocket of the RA-resistant HLA-DRB1*04:02 allomorph interacted with arginine or citrulline-containing epitopes. Peptide elution studies revealed P4 arginine-containing peptides from HLA-DRB1*04:02, but not from HLA-DRB1*04:01/04. Citrullination altered protease susceptibility of vimentin, thereby generating self-epitopes that are presented to T cells in HLA-DRB1*04:01(+) individuals. Using HLA-II tetramers, we observed citrullinated vimentin- and aggrecan-specific CD4(+) T cells in the peripheral blood of HLA-DRB1*04:01(+) RA-affected and healthy individuals. In RA patients, autoreactive T cell numbers correlated with disease activity and were deficient in regulatory T cells relative to healthy individuals. These findings reshape our understanding of the association between citrullination, the HLA-DRB1 locus, and T cell autoreactivity in RA.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, School of Biomedical Sciences, Monash University, Clayton, Victoria 3800, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HLA class II histocompatibility antigen, DR alpha chain
A
189Homo sapiensMutation(s): 0 
Gene Names: HLA-DRA (HLA-DRA1)
Find proteins for P01903 (Homo sapiens)
Go to Gene View: HLA-DRA
Go to UniProtKB:  P01903
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
HLA class II histocompatibility antigen, DRB1-4 beta chain
B
200Homo sapiensMutation(s): 0 
Gene Names: HLA-DRB1
Find proteins for P13760 (Homo sapiens)
Go to Gene View: HLA-DRB1
Go to UniProtKB:  P13760
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Aggrecan core protein
C
15Homo sapiensMutation(s): 1 
Gene Names: ACAN (AGC1, CSPG1, MSK16)
Find proteins for P16112 (Homo sapiens)
Go to Gene View: ACAN
Go to UniProtKB:  P16112
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EDO
Query on EDO

Download SDF File 
Download CCD File 
A
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A, B
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
CIR
Query on CIR
C
L-PEPTIDE LINKINGC6 H13 N3 O3ARG
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.165 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 67.091α = 90.00
b = 182.580β = 90.00
c = 77.539γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
SCALAdata scaling
Blu-Icedata collection
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-12-04
    Type: Initial release
  • Version 1.1: 2013-12-11
    Type: Database references