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TsTX‐VII, a new toxin from Tityus serrulatus scorpion venom able to induce the release of neurotransmitters from rat brain synaptosomes not blocked by tetrodotoxin
Author(s) -
Sampaio Suely V.,
CoutinhoNetto J.,
Arantes Eliane C.,
Toyama Marcos H.,
Novello José C.,
Giglio José R.
Publication year - 1997
Publication title -
iubmb life
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.132
H-Index - 113
eISSN - 1521-6551
pISSN - 1521-6543
DOI - 10.1080/15216549700202351
Subject(s) - venom , tetrodotoxin , scorpion toxin , scorpion , toxin , chemistry , pharmacology , biochemistry , biology , biophysics
A procedure for the isolation of the toxin Tityustoxin VII (TsTX‐VII) from Tityus serrulatus scorpion venom and its biochemical characterization is reported. This protein has a Mr=6,700‐6,800, eight half‐cystine residues accounting for four disulfide bridges and no His. Its N‐terminal sequence GHZGYGS … characterizes it as a new toxin, able to release glutamic acid and gamma aminobutyric acid from rat brain synaptosomes “in vitro”. This release was also induced by the whole venom. Tetrodotoxin however blocked the effect of the whole venom but not that of TsTX‐VII, thus suggesting that the releasing mechanism by TsTX‐VII does not involve Na+ but perhaps K+ or Ca++ channels.