Ion-channel blockers are molecules that obstruct the path used by ions to cross the membrane through a protein channel. Many of these are local anesthetics, toxins or drugs of abuse, and the knowledge of their mechanism of action at the atomic level is an important step towards the development of new compounds on a structural basis. A molecular model of the transmembrane region of the nicotinic acetylcholine receptor, an important brain and muscle fast signaling protein, was used as a target for docking several channel blockers by means of an automatic docking method. The combination of the independent docking method and molecular models (of the receptor and blockers) reproduced or explained quite accurately experimental data (photoaffinity labeling, site-directed mutagenesis, binding assays). This represents a strong support for the validity of the predictions made for those molecules for which no experimental data is available and also for the models and methods on which are based.
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