3PRX

Structure of Complement C5 in Complex with CVF and SSL7

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.30 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.209 

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This is version 2.0 of the entry. See complete history. 


Literature

Substrate recognition by complement convertases revealed in the C5-cobra venom factor complex.

Laursen, N.S., Andersen, K.R., Braren, I., Spillner, E., Sottrup-Jensen, L., Andersen, G.R.

(2011) EMBO J 30: 606-616

  • DOI: 10.1038/emboj.2010.341
  • Primary Citation of Related Structures:  
    3PRX, 3PVM

  • PubMed Abstract: 

    • Complement acts as a danger-sensing system in the innate immune system, and its activation initiates a strong inflammatory response and cleavage of the proteins C3 and C5 by proteolytic enzymes, the convertases. These contain a non-catalytic substrate contacting subunit (C3b or C4b) in complex with a protease subunit (Bb or C2a) ...

    Complement acts as a danger-sensing system in the innate immune system, and its activation initiates a strong inflammatory response and cleavage of the proteins C3 and C5 by proteolytic enzymes, the convertases. These contain a non-catalytic substrate contacting subunit (C3b or C4b) in complex with a protease subunit (Bb or C2a). We determined the crystal structures of the C3b homologue cobra venom factor (CVF) in complex with C5, and in complex with C5 and the inhibitor SSL7 at 4.3 Å resolution. The structures reveal a parallel two-point attachment between C5 and CVF, where the presence of SSL7 only slightly affects the C5-CVF interface, explaining the IgA dependence for SSL7-mediated inhibition of C5 cleavage. CVF functions as a relatively rigid binding scaffold inducing a conformational change in C5, which positions its cleavage site in proximity to the serine protease Bb. A general model for substrate recognition by the convertases is presented based on the C5-CVF and C3b-Bb-SCIN structures. Prior knowledge concerning interactions between the endogenous convertases and their substrates is rationalized by this model.

    Organizational Affiliation: 

    Department of Molecular Biology, Aarhus University, Aarhus, Denmark.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Complement C5A, C1676Homo sapiensMutation(s): 0 
Gene Names: C5, CPAMD4
Find proteins for P01031 (Homo sapiens)
Explore P01031 
Go to UniProtKB:  P01031
NIH Common Fund Data Resources
PHAROS:  P01031
GTEx:  ENSG00000106804
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Cobra venom factorB, D1642Naja kaouthiaMutation(s): 0 
Find proteins for Q91132 (Naja kaouthia)
Explore Q91132 
Go to UniProtKB:  Q91132
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Superantigen-like protein 7E [auth X], F [auth Y]231Staphylococcus aureusMutation(s): 0 
Find proteins for D3JIB2 (Staphylococcus aureus)
Explore D3JIB2 
Go to UniProtKB:  D3JIB2
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 4
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseG [auth E], H [auth F], I [auth G], J [auth H]2 N-Glycosylation Oligosaccharides Interaction
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG
Download Ideal Coordinates CCD File 
 K [auth A], L [auth C]2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.30 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.209 
  • Space Group: P 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 163.65α = 90
b = 181.96β = 90
c = 392.78γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-01-19
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary