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PDOC00436
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1995-07-26
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* Thiol-activated cytolysins signature *
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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).