Mu-conotoxin MrVIB

UniProtKB accession:  Q26443

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UniProtKB description:  MuO-conotoxins are gating-modifier toxins that inhibit sodium current by trapping the domain II voltage sensor in the closed position to prevent opening of the sodium channel. This toxin has a preference for Nav1.4/SCN4A over Nav1.2/SCN2A sodium channels. It blocks Nav channels by interacting mainly with the C-terminal part of the pore loop of domain-3. It also blocks fast-inactivating calcium current. Blocks Nav1.8/SCN10A sodium channels and has potent and long-lasting local anesthetic effects. It can also block propagation of action potentials in A- and C-fibers in sciatic nerve as well as skeletal muscle in isolated preparations.