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PDOC00247
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1995-07-26
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* Aerolysin type toxins signature *
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Aerolysin [1] is a cytolytic toxin exported by the gram negative Aeromonas
bacteria. The mature toxin binds to eukaryotic cells and aggregates to form
holes (approximately 3 nm in diameter) leading to the destruction of the
membrane permeability barrier and osmotic lysis. Staphylococcus aureus also
exports a cytotoxin, alpha-toxin [2], whose biological activity is similar to
that of aerolysin. The sequences of both toxins are not similar except for a
stretch of ten residues rather well conserved.
-Consensus pattern: T-x(2)-N-W-x(2)-T-N-T
-Sequences known to belong to this class detected by the pattern: ALL.
-Other sequence(s) detected in SWISS-PROT: NONE.
-Note: Pseudomonas aeruginosa cytotoxin [3] has been said to contain a region
whose sequence is similar to that of the conserved domain of areolysin/alpha-
toxin, but the similarity is very weak and this toxin is not picked up by the
above pattern.
-Last update: April 1990 / Text revised.
[ 1] Howard S.P., Garland W.J., Green M.J., Buckley J.T.
J. Bacteriol. 169:2869-2871(1987).
[ 2] Gray G.S., Kehoe M.
Infect. Immun. 46:615-618(1984).
[ 3] Hayashi T., Kamio Y., Hishinuma F., Usami Y., Titani K., Terawaki Y.
Mol. Microbiol. 3:861-868(1989).