3RJ3

Complement components factor H CCP19-20 (S1191L mutant) and C3D in complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 

wwPDB Validation   3D Report Full Report



Literature

Structural and functional characterization of the product of disease-related factor h gene conversion.

Herbert, A.P.Kavanagh, D.Johansson, C.Morgan, H.P.Blaum, B.S.Hannan, J.P.Barlow, P.N.Uhrin, D.

(2012) Biochemistry 51: 1874-1884

  • DOI: 10.1021/bi201689j
  • Primary Citation of Related Structures:  
    3RJ3

  • PubMed Abstract: 
  • Numerous complement factor H (FH) mutations predispose patients to atypical hemolytic uremic syndrome (aHUS) and other disorders arising from inadequately regulated complement activation. No unifying structural or mechanistic consequences have been ascri ...

    Numerous complement factor H (FH) mutations predispose patients to atypical hemolytic uremic syndrome (aHUS) and other disorders arising from inadequately regulated complement activation. No unifying structural or mechanistic consequences have been ascribed to these mutants beyond impaired self-cell protection. The S1191L and V1197A mutations toward the C-terminus of FH, which occur in patients singly or together, arose from gene conversion between CFH encoding FH and CFHR1 encoding FH-related 1. We show that neither single nor double mutations structurally perturbed recombinant proteins consisting of the FH C-terminal modules, 19 and 20 (FH19-20), although all three FH19-20 mutants were poor, compared to wild-type FH19-20, at promoting hemolysis of C3b-coated erythrocytes through competition with full-length FH. Indeed, our new crystal structure of the S1191L mutant of FH19-20 complexed with an activation-specific complement fragment, C3d, was nearly identical to that of the wild-type FH19-20:C3d complex, consistent with mutants binding to C3b with wild-type-like affinity. The S1191L mutation enhanced thermal stability of module 20, whereas the V1197A mutation dramatically decreased it. Thus, although mutant proteins were folded at 37 °C, they differ in conformational rigidity. Neither single substitutions nor double substitutions increased measurably the extent of FH19-20 self-association, nor did these mutations significantly affect the affinity of FH19-20 for three glycosaminoglycans, despite critical roles of module 20 in recognizing polyanionic self-surface markers. Unexpectedly, FH19-20 mutants containing Leu1191 self-associated on a heparin-coated surface to a higher degree than on surfaces coated with dermatan or chondroitin sulfates. Thus, potentially disease-related functional distinctions between mutants, and between FH and FH-related 1, may manifest in the presence of specific glycosaminoglycans.


    Organizational Affiliation

    Edinburgh Biomolecular NMR Unit, EastChem School of Chemistry, University of Edinburgh, Edinburgh EH9 3JJ, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Complement C3d fragment ABC317Homo sapiensMutation(s): 0 
Gene Names: C3CPAMD1
Find proteins for P01024 (Homo sapiens)
Explore P01024 
Go to UniProtKB:  P01024
NIH Common Fund Data Resources
PHAROS:  P01024
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Complement Factor H-related protein 1 DEF129Homo sapiensMutation(s): 0 
Gene Names: 
CFHR1CFHLCFHL1CFHL1PCFHR1PFHR1HFL1HFL2CFHHF...
CFHR1CFHLCFHL1CFHL1PCFHR1PFHR1HFL1HFL2CFHHFHF1HF2

Find proteins for P08603 (Homo sapiens)
Explore P08603 
Go to UniProtKB:  P08603
NIH Common Fund Data Resources
PHAROS:  P08603
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.75α = 112.61
b = 82.62β = 110.26
c = 85.4γ = 99.84
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-03-14
    Type: Initial release