5JLZ

Crystal structure of HLA-DRB1*04:01 in complex with modified alpha-enolase peptide 26-40 with citrulline at the position 32


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.99 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.206 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Functional and Structural Characterization of a Novel HLA-DRB1*04:01-Restricted alpha-Enolase T Cell Epitope in Rheumatoid Arthritis.

Gerstner, C.Dubnovitsky, A.Sandin, C.Kozhukh, G.Uchtenhagen, H.James, E.A.Ronnelid, J.Ytterberg, A.J.Pieper, J.Reed, E.Tandre, C.Rieck, M.Zubarev, R.A.Ronnblom, L.Sandalova, T.Buckner, J.H.Achour, A.Malmstrom, V.

(2016) Front Immunol 7: 494-494

  • DOI: 10.3389/fimmu.2016.00494
  • Primary Citation of Related Structures:  5LAX

  • PubMed Abstract: 
  • Antibodies to citrullinated proteins, common in rheumatoid arthritis (RA) patients, are strongly associated to a specific set of HLA-DR alleles including HLA-DRB1*04:01, *04:04, and *01:01. Here, we first demonstrate that autoantibody levels toward t ...

    Antibodies to citrullinated proteins, common in rheumatoid arthritis (RA) patients, are strongly associated to a specific set of HLA-DR alleles including HLA-DRB1*04:01, *04:04, and *01:01. Here, we first demonstrate that autoantibody levels toward the dominant citrullinated B cell epitope from α-enolase are significantly elevated in HLA-DRB1*04:01-positive RA patients. Furthermore, we identified α-enolase-derived T cell epitopes and demonstrated that native and citrullinated versions of several peptides bind with different affinities to HLA-DRB1*04:01, *04:04, and *01:01. The citrulline residues in the eight identified peptides are distributed throughout the entire length of the presented epitopes and more specifically, localized at peptide positions p-2, p2, p4, p6, p7, p10, and p11. Importantly, in contrast to its native version peptide 26 (TSKGLFRAAVPSGAS), the HLA-DRB1*04:01-restricted citrullinated peptide Cit26 (TSKGLFCitAAVPSGAS) elicited significant functional T cell responses in primary cells from RA patients. Comparative analysis of the crystal structures of HLA-DRB1*04:01 in complex with peptide 26 or Cit26 demonstrated that the posttranslational modification did not alter the conformation of the peptide. And since citrullination is the only structural difference between the two complexes, this indicates that the neo-antigen Cit26 is recognized by T cells with high specificity to the citrulline residue.


    Organizational Affiliation

    Rheumatology Unit, Department of Medicine Solna, Center for Molecular Medicine, Karolinska Institutet, Karolinska University Hospital , Stockholm , Sweden.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HLA class II histocompatibility antigen, DR alpha chain
A, C
189Homo sapiensGene 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, D
198Homo sapiensGene Names: HLA-DRB1
Find proteins for P13760 (Homo sapiens)
Go to Gene View: HLA-DRB1
Go to UniProtKB:  P13760
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Alpha-enolase
E, F
15Homo sapiensGene Names: ENO1 (ENO1L1, MBPB1, MPB1)
EC: 4.2.1.11
Find proteins for P06733 (Homo sapiens)
Go to Gene View: ENO1
Go to UniProtKB:  P06733
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MLA
Query on MLA

Download SDF File 
Download CCD File 
D
MALONIC ACID
DICARBOXYLIC ACID C3; PROPANEDIOLIC ACID; METHANEDICARBOXYLIC ACID
C3 H4 O4
OFOBLEOULBTSOW-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
CIR
Query on CIR
E, F
L-PEPTIDE LINKINGC6 H13 N3 O3ARG
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.99 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.206 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 69.442α = 90.00
b = 73.782β = 90.00
c = 145.482γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
XDSdata scaling
REFMACrefinement
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-12-07
    Type: Initial release