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- ****************************************
- * Thiol-activated cytolysins signature *
- ****************************************
-
- Thiol-activated cytolysins [1,2] are toxins produced by a variety of gram-
- positive bacteria and are characterized by their ability to lyse cholesterol-
- containing membranes, their reversible inactivation by oxidation and their
- capacity to bind to cholesterol. The sequences of some of these toxins is
- currently known:
-
- - Alveolysin (gene alv) from Bacillus alvei.
- - Ivanolysin (gene ilo) from Listeria ivanovii.
- - Listeriolysin O (gene hlyA) from Listeria monocytogenes.
- - Perfringolysin O (theta-toxin) (gene pfo) from Clostridium perfringens.
- - Pneumolysin (gene ply) from Streptococcus pneumoniae.
- - Seeligeriolysin (gene lso) from Listeria seeligeri.
- - Streptolysin O (gene slo) from Streptococcus pyogenes.
-
- All these proteins contain a single cysteine residue, located in their C-
- terminal section, which has been shown [3] to be essential for the binding
- to cholesterol. This cysteine is located in a highly conserved region that can
- be used as a signature pattern.
-
- -Consensus pattern: [RK]-E-C-T-G-L-x-W-E-W-W-[RK]
- [C is involved in the binding to cholesterol]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: October 1993 / Pattern and text revised.
-
- [ 1] Alouf J.E., Geoffroy C.
- (In) Bacterial proteins toxins, pp 165-171, Alouf J.E., Ferenbach F.J.,
- Free J.H., Jeljaszewicz J., Ed., Academic Press, London, (1984).
- [ 2] Geoffroy C., Mengaud J., Alouf J.E., Cossart P.
- J. Bacteriol. 172:7301-7305(1990).
- [ 3] Iwamoto M., Ohno-Iwashita Y., Ando S.
- Eur. J. Biochem. 167:425-430(1987).
-