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Related Experiment Video

Updated: May 9, 2026

Synthesis and Structure Determination of &#181;-Conotoxin PIIIA Isomers with Different Disulfide Connectivities
11:44

Synthesis and Structure Determination of µ-Conotoxin PIIIA Isomers with Different Disulfide Connectivities

Published on: October 2, 2018

Re-engineering the μ-conotoxin SIIIA scaffold.

K B Akondi1, R J Lewis, P F Alewood

  • 1Institute for Molecular Bioscience (IMB), The University of Queensland, Brisbane, 4072, Queensland, Australia.

Biopolymers
|August 6, 2013
PubMed
Summary
This summary is machine-generated.

Researchers modified µ-Conotoxin SIIIA to create potent blockers for voltage-gated sodium (Nav) 1.2 channels, offering potential for new neuropathic pain therapies.

Keywords:
NMR spectroscopySPPSpeptidespeptidomimeticsstructure activity relationshipsvoltage gated sodium channelsμ-SIIIAμ-conotoxin

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Molecular Biology

Background:

  • Voltage-gated sodium (Nav) channels are crucial for nerve impulse transmission.
  • Nav channel dysfunction is linked to disorders like neuropathic pain.
  • Targeted Nav channel blockers are needed for therapeutic development.

Purpose of the Study:

  • To reengineer µ-Conotoxin SIIIA (a Nav 1.2 blocker) to develop novel mimetics with altered selectivity.
  • To investigate the role of SIIIA loop 1 in Nav channel interactions.

Main Methods:

  • Site-directed mutagenesis was used to alter charges and truncate loop 1 of µ-Conotoxin SIIIA.
  • The potency and selectivity of engineered mutants against Nav channels were assessed.

Main Results:

  • A mutant, [N5K/D15A]SIIIA(3-20), showed significantly enhanced potency against Nav 1.2 channels (0.5 nM IC50).
  • Modifications in loop 1 unexpectedly influenced SIIIA's interaction with Nav channels.
  • Further truncations resulted in a loss of potency.

Conclusions:

  • Loop 1 of SIIIA plays a significant role in Nav channel interactions, contrary to previous assumptions.
  • A minimal functional conotoxin scaffold was identified, paving the way for developing selective Nav channel blockers.
  • These findings could lead to new treatments for conditions like neuropathic pain.