Product Name:μ-conotoxin-PIIIA
Synonyms:μ-Conotoxin P3.7
Purity:95%
Molar Mass:2604
Chemical Formula:QRLCCGFPKSCRSRQCKPHRCC
Storage:Store at -20 degrees Celsius
Sequence:QRLCCGFPKSCRSRQCKPHRCC
Target:Various NaV channels
Application:
μ-Conotoxin PIIIA is a peptide toxin isolated from the venom of the marine cone snail Conus purpurascens. It selectively inhibits voltage-gated sodium channels, particularly Nav1.4 in skeletal muscle and Nav1.2 in neurons. By blocking sodium ion flow through these channels, μ-conotoxin PIIIA prevents the generation and propagation of action potentials, making it a valuable tool in studying sodium channel function and neuromuscular transmission. This peptide is of significant interest in pain research and neurophysiology, with potential implications for the development of novel analgesics and therapies for conditions like chronic pain and neuromuscular disorders.
Current Research:
μ-Conotoxin PIIIA is a 22-amino-acid peptide isolated from the venom of the marine cone snail Conus purpurascens. It functions as a potent blocker of voltage-gated sodium channels (Naᵥ), particularly the Naᵥ1.4 subtype found in skeletal muscle. This specificity makes it a valuable tool for studying sodium channel physiology and potential therapeutic applications.
Structural Characteristics
The peptide's structure includes three disulfide bridges, which are crucial for its stability and bioactivity. These disulfide bonds contribute to the peptide's ability to effectively occlude the sodium channel pore, thereby inhibiting ion conductance. The specific disulfide connectivity pattern of μ-Conotoxin PIIIA has been determined, providing insights into its functional conformation.
Mechanism of Action
μ-Conotoxin PIIIA binds to site I on the α-subunit of voltage-gated sodium channels, physically blocking the channel pore. This action prevents sodium ion influx, thereby inhibiting action potential propagation in muscle cells. The peptide exhibits high specificity for the Naᵥ1.4 channel, with an inhibition constant (IC₅₀) of approximately 44 nM.
Research Applications
Due to its specificity, μ-Conotoxin PIIIA is extensively used in neurophysiological studies to:
Investigate Sodium Channel Function: By selectively inhibiting Naᵥ1.4 channels, researchers can study the role of these channels in muscle physiology and related pathologies.
Develop Therapeutic Agents: Understanding the interaction between μ-Conotoxin PIIIA and sodium channels aids in the design of novel therapeutics targeting channelopathies.
Clinical Implications
The ability of μ-Conotoxin PIIIA to selectively block muscle-specific sodium channels positions it as a potential therapeutic candidate for conditions involving hyperexcitability of skeletal muscles, such as certain myotonias. However, its application is currently limited to research settings, and further studies are necessary to explore its therapeutic potential.
Conclusion
μ-Conotoxin PIIIA serves as a powerful tool in the study of voltage-gated sodium channels, offering insights into their function and paving the way for potential therapeutic developments targeting muscle-related disorders.
Reference:
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