2WII

Complement C3b in complex with factor H domains 1-4

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.218 

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Literature

Structure of complement fragment C3b-factor H and implications for host protection by complement regulators.

Wu, J., Wu, Y.Q., Ricklin, D., Janssen, B.J., Lambris, J.D., Gros, P.

(2009) Nat Immunol 10: 728-733

  • DOI: 10.1038/ni.1755
  • Primary Citation of Related Structures:  
    2WII

  • PubMed Abstract: 

    • Factor H (FH) is an abundant regulator of complement activation and protects host cells from self-attack by complement. Here we provide insight into the regulatory activity of FH by solving the crystal structure of the first four domains of FH in complex ...

    Factor H (FH) is an abundant regulator of complement activation and protects host cells from self-attack by complement. Here we provide insight into the regulatory activity of FH by solving the crystal structure of the first four domains of FH in complex with its target, complement fragment C3b. FH interacted with multiple domains of C3b, covering a large, extended surface area. The structure indicated that FH destabilizes the C3 convertase by competition and electrostatic repulsion and that FH enables proteolytic degradation of C3b by providing a binding platform for protease factor I while stabilizing the overall domain arrangement of C3b. Our results offer general models for complement regulation and provide structural explanations for disease-related mutations in the genes encoding both FH and C3b.

    Organizational Affiliation: 

    Crystal and Structural Chemistry, Bijvoet Center for Biomolecular Research, Department of Chemistry, Utrecht University, Utrecht, The Netherlands.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
COMPLEMENT C3 BETA CHAIN A645Homo sapiensMutation(s): 0 
Gene Names: C3, CPAMD1
Find proteins for P01024 (Homo sapiens)
Explore P01024 
Go to UniProtKB:  P01024
NIH Common Fund Data Resources
PHAROS:  P01024
GTEx:  ENSG00000125730
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
COMPLEMENT C3B ALPHA' CHAIN B915Homo sapiensMutation(s): 0 
Gene Names: C3, CPAMD1
Find proteins for P01024 (Homo sapiens)
Explore P01024 
Go to UniProtKB:  P01024
NIH Common Fund Data Resources
PHAROS:  P01024
GTEx:  ENSG00000125730
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
COMPLEMENT FACTOR H C277Homo sapiensMutation(s): 1 
Gene Names: CFH, HF, HF1, HF2
Find proteins for P08603 (Homo sapiens)
Explore P08603 
Go to UniProtKB:  P08603
NIH Common Fund Data Resources
PHAROS:  P08603
GTEx:  ENSG00000000971
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 4
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
beta-D-mannopyranose-(1-6)-beta-D-mannopyranose-(1-6)-[beta-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
D
6 N-Glycosylation Oligosaccharides Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.218 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 223.489α = 90
b = 84.946β = 90
c = 128.77γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-06-09
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-02-28
    Changes: Database references, Source and taxonomy
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Other, Structure summary