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Related Experiment Videos

New polypeptide components purified from mamba venom.

J Tytgat1, I Vandenberghe, C Ulens

  • 1Laboratory of Toxicology, University of Leuven, Belgium. jan.tytgat@farmkuleuven.ac.be

FEBS Letters
|March 10, 2001
PubMed
Summary

Two new dendrotoxins, DaE1 and DaE2, were isolated from snake venom and found to inhibit Kv1.1 channels. These novel polypeptides show high similarity to known trypsin inhibitors.

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Area of Science:

  • Biochemistry
  • Neuroscience
  • Pharmacology

Background:

  • Dendroaspis angusticeps venom is a source of bioactive peptides.
  • Dendrotoxins are known to interact with voltage-gated potassium channels.

Purpose of the Study:

  • To isolate and characterize novel polypeptide components from Dendroaspis angusticeps venom.
  • To investigate the channel inhibitory activity of these new polypeptides.

Main Methods:

  • Isolation and purification of polypeptides using chromatography.
  • Full amino acid sequencing and mass spectrometry.
  • Electrophysiological assays to determine channel inhibition.

Main Results:

  • Two novel polypeptides, DaE1 (59 amino acids) and DaE2 (57 amino acids), were purified.

Related Experiment Videos

  • DaE1 and DaE2 exhibit high sequence identity to Dendroaspis polylepis polylepis trypsin inhibitor E.
  • Both polypeptides inhibit Kv1.1 channels with IC(50) values around 300 nM.
  • DaE polypeptides do not affect Kir2.1 channels.

    • Conclusions:

    • DaE1 and DaE2 represent new dendrotoxins from Dendroaspis angusticeps venom.
    • These novel toxins exhibit moderate affinity for Kv1.1 channels.
    • The findings contribute to understanding the diversity of venom components and their interactions with ion channels.