Mu-conotoxin CnIIIC

UniProtKB accession:  I1SB07

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UniProtKB description:  Mu-conotoxins block voltage-gated sodium channels (Nav). This synthetic toxin blocks both voltage-gated sodium channels and nicotinic acetylcholine receptor (nAChR). Inhibits the skeletal muscle rNav1.4/SCN4A (IC(50)=1.3 nM) and the brain rNav1.2/SCN2A in a long-lasting manner. A low inhibition is also observed on neuronal mNav1.6/SCN8A and mNav1.7/SCN9A. Modestly blocks nAChR alpha-3/beta-2 subtype (IC(50)=450 nM) (partially reversible) and, to a lesser extent, alpha-7 and alpha-4/beta-2 subtypes (reversible). In vitro, decreases twitch tension in mouse hemidiaphragms (IC(50)=150 nM), and displays a high blocking effect in mouse extensor digitorum longus muscles (IC(50)=46 nM).