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PDOC00250
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1995-07-26
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* Staphyloccocal enterotoxins / Streptococcal pyrogenic exotoxins signatures *
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Staphyloccocal enterotoxins and streptococcal pyrogenic exotoxins constitute a
family of biologically and structurally related toxins produced by
Staphylococcus aureus and Streptococcus pyogenes [1,2]. These toxins share
the ability to bind to the major histocompatibility complex proteins of their
hosts. The toxins that belong to this family are:
- Staphyloccocal enterotoxins are the cause of staphylococcal food poisoning
syndrome. The sequence of six different enterotoxins is known: SEA, SEB,
SEC1, SEC3, SED, and SEE.
- Streptococcal pyrogenic exotoxins are the causative agents of the symptoms
associated with scarlet fever. The sequence of two pyrogenic exotoxins is
known: SPEA, and SPEC.
- Staphylococcus aureus toxic shock syndrome toxin-1 (TSST-1).
While the enterotoxins and the pyrogenic exotoxins are closely related, TSST-1
seems to be only distantly related to the other toxins. We developed two
patterns for this family of toxins. The first one is based on a well conserved
region of enterotoxins and pyrogenic exotoxins, but which does not pick up
TSST-1; the second pattern is derived from a more diffuse region of similarity
common to all these toxins.
-Consensus pattern: Y-G-G-[LIV]-T-x(4)-N
-Sequences known to belong to this class detected by the pattern: ALL, except
for TSST-1.
-Other sequence(s) detected in SWISS-PROT: NONE.
-Consensus pattern: K-x(2)-[LIV]-x(4)-[LIV]-D-x(3)-R-x(2)-L-x(5)-[LIV]-Y
-Sequences known to belong to this class detected by the pattern: ALL.
-Other sequence(s) detected in SWISS-PROT: NONE.
-Last update: June 1990 / Text revised.
[ 1] Iandolo J.J.
Annu. Rev. Microbiol. 43:375-402(1989).
[ 2] Marrack P., Kappler J.
Science 248:705-711(1990).