4MUC

The 4th and 5th C-terminal domains of Factor H related protein 1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.897 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.207 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The Major Autoantibody Epitope on Factor H in Atypical Hemolytic Uremic Syndrome Is Structurally Different from Its Homologous Site in Factor H-related Protein 1, Supporting a Novel Model for Induction of Autoimmunity in This Disease.

Bhattacharjee, A.Reuter, S.Trojnar, E.Kolodziejczyk, R.Seeberger, H.Hyvarinen, S.Uzonyi, B.Szilagyi, A.Prohaszka, Z.Goldman, A.Jozsi, M.Jokiranta, T.S.

(2015) J.Biol.Chem. 290: 9500-9510

  • DOI: 10.1074/jbc.M114.630871

  • PubMed Abstract: 
  • Atypical hemolytic uremic syndrome (aHUS) is characterized by complement attack against host cells due to mutations in complement proteins or autoantibodies against complement factor H (CFH). It is unknown why nearly all patients with autoimmune aHUS ...

    Atypical hemolytic uremic syndrome (aHUS) is characterized by complement attack against host cells due to mutations in complement proteins or autoantibodies against complement factor H (CFH). It is unknown why nearly all patients with autoimmune aHUS lack CFHR1 (CFH-related protein-1). These patients have autoantibodies against CFH domains 19 and 20 (CFH19-20), which are nearly identical to CFHR1 domains 4 and 5 (CFHR14-5). Here, binding site mapping of autoantibodies from 17 patients using mutant CFH19-20 constructs revealed an autoantibody epitope cluster within a loop on domain 20, next to the two buried residues that are different in CFH19-20 and CFHR14-5. The crystal structure of CFHR14-5 revealed a difference in conformation of the autoantigenic loop in the C-terminal domains of CFH and CFHR1, explaining the variation in binding of autoantibodies from some aHUS patients to CFH19-20 and CFHR14-5. The autoantigenic loop on CFH seems to be generally flexible, as its conformation in previously published structures of CFH19-20 bound to the microbial protein OspE and a sialic acid glycan is somewhat altered. Cumulatively, our data suggest that association of CFHR1 deficiency with autoimmune aHUS could be due to the structural difference between CFHR1 and the autoantigenic CFH epitope, suggesting a novel explanation for CFHR1 deficiency in the pathogenesis of autoimmune aHUS.


    Organizational Affiliation

    From the Department of Bacteriology and Immunology, Medicum, and Immunobiology Research Program Unit, University of Helsinki and Helsinki University Hospital, 00014 University of Helsinki, Finland, the Institute of Biotechnology and arnab.bhattacharjee@helsinki.fi.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Complement factor H-related protein 1
A, B
125Homo sapiensMutation(s): 0 
Gene Names: CFHR1 (CFHL, CFHL1, CFHL1P, CFHR1P, FHR1, HFL1, HFL2)
Find proteins for Q03591 (Homo sapiens)
Go to Gene View: CFHR1
Go to UniProtKB:  Q03591
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.897 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.207 
  • Space Group: P 6 2 2
Unit Cell:
Length (Å)Angle (°)
a = 143.406α = 90.00
b = 143.406β = 90.00
c = 77.784γ = 120.00
Software Package:
Software NamePurpose
PHENIXrefinement
ADSCdata collection
DNAdata collection
XDSdata scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-02-18
    Type: Initial release
  • Version 1.1: 2015-02-25
    Type: Database references
  • Version 1.2: 2015-05-06
    Type: Database references