1CA1

ALPHA-TOXIN FROM CLOSTRIDIUM PERFRINGENS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.208 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure of the key toxin in gas gangrene.

Naylor, C.E.Eaton, J.T.Howells, A.Justin, N.Moss, D.S.Titball, R.W.Basak, A.K.

(1998) Nat Struct Biol 5: 738-746

  • DOI: 10.1038/1447
  • Primary Citation of Related Structures:  
    1CA1

  • PubMed Abstract: 
  • Clostridium perfringens alpha-toxin is the key virulence determinant in gas gangrene and has also been implicated in the pathogenesis of sudden death syndrome in young animals. The toxin is a 370-residue, zinc metalloenzyme that has phospholipase C activity, and can bind to membranes in the presence of calcium ...

    Clostridium perfringens alpha-toxin is the key virulence determinant in gas gangrene and has also been implicated in the pathogenesis of sudden death syndrome in young animals. The toxin is a 370-residue, zinc metalloenzyme that has phospholipase C activity, and can bind to membranes in the presence of calcium. The crystal structure of the enzyme reveals a two-domain protein. The N-terminal domain shows an anticipated structural similarity to Bacillus cereus phosphatidylcholine-specific phospholipase C (PC-PLC). The C-terminal domain shows a strong structural analogy to eukaryotic calcium-binding C2 domains. We believe this is the first example of such a domain in prokaryotes. This type of domain has been found to act as a phospholipid and/or calcium-binding domain in intracellular second messenger proteins and, interestingly, these pathways are perturbed in cells treated with alpha-toxin. Finally, a possible mechanism for alpha-toxin attack on membrane-packed phospholipid is described, which rationalizes its toxicity when compared to other, non-haemolytic, but homologous phospholipases C.


    Related Citations: 
    • Crystallization and Preliminary X-Ray Diffraction Studies of Alpha-Toxin from Two Different Strains (Nctc8237 and Cer89L43) of Clostridium Perfringens
      Basak, A.K., Howells, A., Eaton, J.T., Moss, D.S., Naylor, C.E., Miller, J., Titball, R.W.
      (1998) Acta Crystallogr D Biol Crystallogr 54: 1425

    Organizational Affiliation

    Department of Crystallography, Birkbeck College, London, England.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ALPHA-TOXINA370Clostridium perfringensMutation(s): 0 
Gene Names: cpa
EC: 3.1.4.3
Membrane Entity: Yes 
UniProt
Find proteins for P0C216 (Clostridium perfringens (strain 13 / Type A))
Explore P0C216 
Go to UniProtKB:  P0C216
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.208 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.3α = 90
b = 177.3β = 90
c = 79.1γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling
X-PLORphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-05-04
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2011-11-16
    Changes: Atomic model