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Determining sequences and post-translational modifications of novel conotoxins in Conus victoriae using cDNA

Jennifer A Jakubowski1, David A Keays, Wayne P Kelley

  • 1Department of Chemistry and the Beckman Institute, University of Illinois, Urbana-Champaign, Illinois 61801, USA.

Journal of Mass Spectrometry : JMS
|June 2, 2004
PubMed

Insights

Researchers identified eleven novel conotoxins from Conus victoriae using molecular and mass spectrometry methods. These conotoxins, including alpha-conotoxin Vc1.1 with pain-relieving properties, exhibit unique post-translational modifications.

Area of Science:

  • Marine Biology
  • Biochemistry
  • Pharmacology

Background:

  • Conotoxins are peptides from cone snail venom with diverse pharmacological activities.
  • Conus victoriae venom is a source of novel bioactive compounds.

Purpose of the Study:

  • To identify and characterize novel conotoxins from Conus victoriae.
  • To determine the sequences and post-translational modifications of specific conotoxins.

Main Methods:

  • cDNA cloning and sequencing
  • Liquid chromatography/electrospray ionization ion trap mass spectrometry (LC/ESI-IT-MS)
  • Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS)
  • Nanospray ionization ion trap mass spectrometry with collisionally induced dissociation (NSI-IT-MS/CID)

Main Results:

  • Eleven novel conotoxin sequences were identified: Vc1.1 (A superfamily), Vc6.1-Vc6.6 (O superfamily), and Vc5.1-Vc5.4 (T superfamily).
  • Post-translational modifications were identified in vc1a, vc5a, and vc6a, including hydroxyproline and gamma-carboxyglutamate in vc1a.
  • Vc1.1 (alpha-conotoxin) is a 16-amino acid peptide with pain-relieving properties.

Conclusions:

  • The study expands the known diversity of conotoxins from Conus victoriae.
  • Novel conotoxins with unique post-translational modifications were characterized.
  • Vc1.1 shows potential for pain management therapies.

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