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.Mol.Biol. 5: 738-746
- PubMed: 9699639
- DOI: 10.1038/1447
- Also Cited By: 2WY6, 2WXU, 2WXT, 1SB4, 1QMD, 1QM6, 1OLP
- PubMed Abstract:
- 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.,Sect.D 54: 1425
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 a ...
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.
Department of Crystallography, Birkbeck College, London, England.