Methyllycaconitine: a selective probe for neuronal α‐bungarotoxin binding sites

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Abstract
The ability of methyllycaconitine (MLA) to inhibit the binding of [125I]α-bungarotoxin to rat brain membranes, frog and human muscle extracts and the human muscle cell line TE671 has been measured. MLA showed a markedly higher affinity for the rat brain site (K i 1.4 × 10−9 M) than for the muscle receptors (K i; 10−5-10−6 M). Structure modelling techniques were used to fit the structure of MLA to a nicotinic pharmacophore model. MLA is the first low molecular weight ligand to be shown to discriminate between muscle nicotinic receptors and their α-bungarotoxinbinding counterpart in the brain, and as such may be a useful structural probe for pursuing the structural and functional properties of the neuronal protein.