μ-Conotoxin K IIIA is a cysteine-rich, disulfide-stabilized peptide used to probe voltage-gated sodium channel interactions. Its rigid structure supports highly selective binding studies. Researchers analyze folding pathways, solvent effects, and binding kinetics. Applications include neuropeptide research, channel-mapping studies, and structural biophysics.
CAT No: R2557
CAS No:884469-67-4
Synonyms/Alias:mu-Conotoxin K IIIA;UNII-390H5GUO40;CHEMBL2402969;390H5GUO40;884469-67-4;Ccncsskwcrdhsrcc-NH2 cyclic (1->9),(2->15),(4->16);L-Cysteinamide, L-cysteinyl-L-cysteinyl-L-asparaginyl-L-cysteinyl-L-seryl-L-seryl-L-lysyl-L-tryptophyl-L-cysteinyl-L-arginyl-L-alpha-aspartyl-L-histidyl-L-seryl-L-arginyl-L-cysteinyl-, cyclic (1->9),(2->15),(4->16)-tris(disulfide);mu-Conotoxin KIIIA;BDBM50492340;DA-68915;
mu-Conotoxin K IIIA is a specialized peptide toxin derived from the venom of marine cone snails, particularly Conus species. Characterized by its unique disulfide-rich structure, this conotoxin exhibits high selectivity and affinity for specific voltage-gated sodium channels (Nav), making it a valuable tool in neurophysiological research. Its molecular configuration enables precise modulation of ion channel activity, which is integral to the transmission of electrical signals in excitable tissues such as nerves and muscles. Researchers value mu-Conotoxin K IIIA for its stability, specificity, and ability to dissect complex channelopathies without the off-target effects seen with less selective channel blockers. The peptide's bioactivity and structural features position it as a critical reagent for advancing our understanding of sodium channel function and related pathologies.
Ion Channel Research: mu-Conotoxin K IIIA is extensively utilized in the investigation of voltage-gated sodium channels, particularly Nav1.2 and Nav1.4 subtypes. By selectively binding to these channels and inhibiting their activity, the peptide allows scientists to delineate the physiological roles of distinct sodium channel isoforms in neuronal and muscular tissues. This specificity is essential for mapping channel distribution, understanding gating mechanisms, and identifying the contributions of individual channels to action potential generation and propagation. Its use in electrophysiological assays, such as patch-clamp recordings, provides detailed insights into channel kinetics and pharmacology, facilitating the development of new hypotheses regarding sodium channelopathies.
Pain Pathway Analysis: K IIIA serves as a crucial tool in elucidating the molecular mechanisms underlying pain signaling. By selectively blocking sodium channels implicated in nociceptive pathways, the peptide enables researchers to pinpoint the involvement of specific channel isoforms in the initiation and maintenance of pain states. This application is particularly valuable in the study of chronic and neuropathic pain, where aberrant sodium channel activity contributes to pathological excitability. The ability to isolate the effects of individual channels advances our understanding of pain physiology and informs the search for novel molecular targets in pain modulation.
Neuroprotection Studies: The selective inhibitory action of mu-Conotoxin K IIIA on sodium channels also finds application in neuroprotection research. Excessive sodium influx through voltage-gated channels is a key factor in neuronal injury during events such as ischemia or excitotoxicity. By attenuating this influx, the conotoxin provides a model for studying protective mechanisms against neuronal damage. Researchers employ it in in vitro and ex vivo models to explore how sodium channel inhibition can mitigate cellular injury, providing critical data for the development of neuroprotective strategies and enhancing our understanding of neuronal resilience.
Muscle Physiology Investigations: Researchers leverage K IIIA to dissect the role of sodium channels in skeletal muscle function and disorders. Its high affinity for muscle-specific channel subtypes allows for the selective inhibition of sodium currents in muscle fibers, enabling detailed studies of excitation-contraction coupling, muscle excitability, and channelopathies such as periodic paralysis. The ability to modulate channel activity with precision supports the identification of molecular defects underlying muscle dysfunction and aids in the characterization of pharmacological profiles for potential therapeutic agents targeting muscle sodium channels.
Toxin Structure-Activity Relationship (SAR) Studies: The unique primary sequence and disulfide connectivity of mu-Conotoxin K IIIA make it a valuable model for structure-activity relationship investigations among conotoxins and other peptide toxins. Researchers employ chemical synthesis, mutagenesis, and structural analysis techniques to probe the determinants of channel selectivity and potency. Insights gained from these studies contribute to the rational design of novel peptide analogs with improved specificity or altered pharmacological properties, expanding the utility of conotoxins as research tools and molecular probes in ion channel biology.
In summary, mu-Conotoxin K IIIA stands as a versatile and scientifically significant peptide for the study of voltage-gated sodium channels and their roles in neurophysiology, pain signaling, neuroprotection, muscle function, and toxin structure-activity relationships. Its high selectivity, stability, and well-characterized mechanism of action enable researchers to address fundamental questions in ion channel biology and advance the discovery of new molecular targets. By facilitating precise modulation and analysis of sodium channel activity, this conotoxin continues to drive innovation and deepen our understanding of excitable tissue physiology and pathophysiology.
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