Brevetoxin derivatives that inhibit toxin activity

Sherry L. Purkerson-Parker, Lynne A. Fieber, Kathleen S. Rein, Tchao Podona, Daniel G. Baden

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

Background: The brevetoxins are marine neurotoxins that interfere with the normal functions of the voltage-gated Na+ channel. We have identified two brevetoxin derivatives that do not exhibit pharmacological properties typical of the brevetoxins and that function as brevetoxin antagonists. Results: PbTx-3 and benzoyl-PbTx-3 elicited Na+ channel openings during steady-state depolarizations; however, two PbTx-3 derivatives retained their ability to bind to the receptor, but did not elicit Na+ channel openings. α-Naphthoyl-PbTx-3 acted as a PbTx-3 antagonist but did not affect Na+ channels that were not exposed to PbTx-3. β-Naphthoyl-PbTx-3 reduced openings of Na+ channels that were not exposed to PbTx-3. Conclusions: Some modifications to the brevetoxin molecule do not alter either the binding properties or the activity of these toxins. Larger modifications to the K-ring sidechain do not interfere with binding but have profound effects on their pharmacological properties. This implies a critical function for the K-ring sidechain of the native toxin.

Original languageEnglish (US)
Pages (from-to)385-393
Number of pages9
JournalChemistry and Biology
Volume7
Issue number6
DOIs
StatePublished - Jun 1 2000
Externally publishedYes

Keywords

  • Brevetoxin antagonists
  • Brevetoxins
  • Marine neurotoxins
  • Sodium channel

ASJC Scopus subject areas

  • Organic Chemistry

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    Purkerson-Parker, S. L., Fieber, L. A., Rein, K. S., Podona, T., & Baden, D. G. (2000). Brevetoxin derivatives that inhibit toxin activity. Chemistry and Biology, 7(6), 385-393. https://doi.org/10.1016/S1074-5521(00)00119-8