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Related Experiment Videos

A novel conotoxin framework with a helix-loop-helix (Cs alpha/alpha) fold.

Carolina Möller1, Sanaz Rahmankhah, Janelle Lauer-Fields

  • 1Department of Chemistry and Biochemistry and Center of Excellence in Biomedical and Marine Biotechnology, Florida Atlantic University, Boca Raton, Florida 33431, USA.

Biochemistry
|December 8, 2005
PubMed
Summary

A new family of four-cystine conotoxins from cone snail venom reveals a conserved structural framework, suggesting a shared evolutionary origin with scorpion toxins for prey capture.

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Area of Science:

  • Biochemistry
  • Evolutionary Biology
  • Neurotoxicology

Background:

  • Venomous animals utilize stable peptide scaffolds for prey capture.
  • Cone snails possess diverse conotoxins with unique structural motifs.

Purpose of the Study:

  • To identify and characterize a novel family of conotoxins.
  • To investigate the structural and evolutionary implications of these conotoxins.

Main Methods:

  • Peptide isolation from Conus floridanus floridensis and Conus villepinii venom.
  • Edman degradation sequencing for primary structure determination.
  • Mass spectrometry and NMR spectroscopy for structural analysis.

Main Results:

  • Discovery of a new four-cystine, three-loop conotoxin family (framework 14).

Related Experiment Videos

  • Structural analysis revealed highly helical secondary and helix-loop-helix tertiary structures.
  • Identified a conserved Lys/Tyr dyad in vil14a, similar to scorpion K(+) channel blockers.

    • Conclusions:

    • Framework 14 conotoxins share structural similarities with scorpion toxins.
    • This suggests a common molecular imprint and potential ancestral origin in venom evolution.
    • The findings provide insights into the convergent evolution of venom components.