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Type: Artigo de periódico
Title: TsTX-IV, a short chain four-disulfide-bridged neurotoxin from Tityus serrulatus venom which acts on Ca2+-activated K+ channels
Author: Novello, JC
Arantes, EC
Varanda, WA
Oliveira, B
Giglio, JR
Marangoni, S
Abstract: The primary structure of TsTX-IV, a neurotoxin isolated from Tityus serrulatus scorpion venom, is reported. Its amino acid sequence was determined by automated Edman sequential degradation of the reduced and carboxymethylated toxin and of relevant peptides obtained by digestion with Staphylococcus aureus strain V8 protease or trypsin and cleavage by CNBr. The complete sequence showed 41 amino acid residues, which account for an estimated molecular weight of 4520, and eight half-cystine residues which cross-link the toxin molecule with four disulfide bonds. The molecular weight determined by mass spectrometry was 4518, Comparison of this sequence with those from other scorpion toxins showed a resemblance with toxins which act on different types of K+ channels, TsTx-IV was able to block Ca2+-activated K+ channels of high conductance. TsTX-IV is the first four-disulfide-bridged short toxin from T. serrulatus so far completely sequenced. (C) 1999 Elsevier Science Ltd. All rights reserved.
Subject: Tityus serrulatus
primary structure
Ca2+-activated K+ channels
patch clamp
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Rights: fechado
Identifier DOI: 10.1016/S0041-0101(98)00206-2
Date Issue: 1999
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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