Journal
TOXICON
Volume 54, Issue 1, Pages 56-61Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.toxicon.2009.03.014
Keywords
APETx2; Acid sensing ion channel; Solid-phase peptide synthesis; Native chemical ligation; Disulfide bond; Protein folding
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Funding
- NHMRC [511067]
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Acid sensing ion channels (ASICs) are pH-sensitive channels that are distributed in the central and peripheral nervous system and which are believed to play a key role in pain perception. APETx2, a 42-residue peptide toxin isolated from the sea anemone Anthopleura elegantissima, is the only known selective inhibitor of ASIC3 channels. Here we describe the total chemical synthesis of APETx2 by solid-phase peptide synthesis and native chemical ligation. The folded synthetic toxin had an IC50 of 57 nM for inhibition of rat ASIC3 channels expressed in Xenopus oocytes, in agreement with the IC50 reported for the native toxin (63 nM). The native chemical ligation approach should provide an efficient route for synthesis of other pharmacologically useful disulfide-rich toxins from venomous animals. (C) 2009 Elsevier Ltd. All rights reserved.
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