3FRP

Crystal Structure of Cobra Venom Factor, a Co-factor for C3- and C5 convertase CVFBb


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.61 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.248 
  • R-Value Observed: 0.251 

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This is version 1.1 of the entry. See complete history


Literature

The Crystal Structure of Cobra Venom Factor, a Cofactor for C3- and C5-Convertase CVFBb.

Krishnan, V.Ponnuraj, K.Xu, Y.Macon, K.Volanakis, J.E.Narayana, S.V.

(2009) Structure 17: 611-619

  • DOI: 10.1016/j.str.2009.01.015
  • Primary Citation of Related Structures:  
    3FRP

  • PubMed Abstract: 
  • Cobra venom factor (CVF) is a functional analog of human complement component C3b, the active fragment of C3. Similar to C3b, in human and mammalian serum, CVF binds factor B, which is then cleaved by factor D, giving rise to the CVFBb complex that targe ...

    Cobra venom factor (CVF) is a functional analog of human complement component C3b, the active fragment of C3. Similar to C3b, in human and mammalian serum, CVF binds factor B, which is then cleaved by factor D, giving rise to the CVFBb complex that targets the same scissile bond in C3 as the authentic complement convertases C4bC2a and C3bBb. Unlike the latter, CVFBb is a stable complex and an efficient C5 convertase. We solved the crystal structure of CVF, isolated from Naja naja kouthia venom, at 2.6 A resolution. The CVF crystal structure, an intermediate between C3b and C3c, lacks the TED domain and has the CUB domain in an identical position to that seen in C3b. The similarly positioned CUB and slightly displaced C345c domains of CVF could play a vital role in the formation of C3 convertases by providing important primary binding sites for factor B.


    Organizational Affiliation

    University of Alabama at Birmingham, Birmingham, AL 35294, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cobra venom factor alpha chain A627Naja 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: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Cobra venom factor gamma chain G252Naja kaouthiaMutation(s): 0 
Find proteins for Q91132 (Naja kaouthia)
Explore Q91132 
Go to UniProtKB:  Q91132
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Cobra venom factor beta chain B379Naja kaouthiaMutation(s): 0 
Find proteins for Q91132 (Naja kaouthia)
Explore Q91132 
Go to UniProtKB:  Q91132
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download Ideal Coordinates CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.61 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.248 
  • R-Value Observed: 0.251 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 134.138α = 90
b = 151.141β = 90
c = 76.787γ = 90
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-04-28
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance