3SW0

Structure of the C-terminal region (modules 18-20) of complement regulator Factor H


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.184 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Structural Analysis of the C-Terminal Region (Modules 18-20) of Complement Regulator Factor H (FH).

Morgan, H.P.Mertens, H.D.Guariento, M.Schmidt, C.Q.Soares, D.C.Svergun, D.I.Herbert, A.P.Barlow, P.N.Hannan, J.P.

(2012) PLoS One 7: e32187-e32187

  • DOI: https://doi.org/10.1371/journal.pone.0032187
  • Primary Citation of Related Structures:  
    3SW0

  • PubMed Abstract: 

    Factor H (FH) is a soluble regulator of the human complement system affording protection to host tissues. It selectively inhibits amplification of C3b, the activation-specific fragment of the abundant complement component C3, in fluid phase and on self-surfaces and accelerates the decay of the alternative pathway C3 convertase, C3bBb. We have determined the crystal structure of the three carboxyl-terminal complement control protein (CCP) modules of FH (FH18-20) that bind to C3b, and which additionally recognize polyanionic markers specific to self-surfaces. These CCPs harbour nearly 30 disease-linked missense mutations. We have also deployed small-angle X-ray scattering (SAXS) to investigate FH18-20 flexibility in solution using FH18-20 and FH19-20 constructs. In the crystal lattice FH18-20 adopts a "J"-shape: A ~122-degree tilt between the structurally highly similar modules 18 and 19 precedes an extended, linear arrangement of modules 19 and 20 as observed in previously determined structures of these two modules alone. However, under solution conditions FH18-20 adopts multiple conformations mediated by flexibility between CCPs 18 and 19. We also pinpoint the locations of disease-associated missense mutations on the module 18 surface and discuss our data in the context of the C3b:FH interaction.


  • Organizational Affiliation

    Institute of Structural and Molecular Biology, School of Biological Sciences, King's Buildings, University of Edinburgh, Edinburgh, United Kingdom.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Complement factor HA [auth X]188Homo sapiensMutation(s): 0 
Gene Names: CFHHFHF1HF2
UniProt & NIH Common Fund Data Resources
Find proteins for P08603 (Homo sapiens)
Explore P08603 
Go to UniProtKB:  P08603
PHAROS:  P08603
GTEx:  ENSG00000000971 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP08603
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.184 
  • Space Group: P 2 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.97α = 90
b = 68.6β = 90
c = 77.48γ = 90
Software Package:
Software NamePurpose
DNAdata collection
PHASERphasing
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-03-14
    Type: Initial release
  • Version 1.1: 2013-02-13
    Changes: Structure summary
  • Version 1.2: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description