3PRX

Structure of Complement C5 in Complex with CVF and SSL7


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.3 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.1 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:  

  • 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 substrat ...

    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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Complement C5
A, C
1676Homo sapiensMutation(s): 0 
Gene Names: C5 (CPAMD4)
Find proteins for P01031 (Homo sapiens)
Go to Gene View: C5
Go to UniProtKB:  P01031
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Cobra venom factor
B, D
1642Naja kaouthiaMutation(s): 0 
Find proteins for Q91132 (Naja kaouthia)
Go to UniProtKB:  Q91132
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Superantigen-like protein 7
X, Y
231Staphylococcus aureusMutation(s): 0 
Find proteins for D3JIB2 (Staphylococcus aureus)
Go to UniProtKB:  D3JIB2
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download SDF File 
Download CCD File 
A, B, C, D
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.3 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.208 
  • Space Group: P 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 163.650α = 90.00
b = 181.960β = 90.00
c = 392.780γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
PHASERphasing
PHENIXrefinement
XSCALEdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-01-19
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance