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Agonists at the a4b2 Nicotinic Acetylcholine Receptors Relationships and Molecular Modelling

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Agonists of the a4b2 nicotinic acetylcholine receptors have been synthesised as potential drugs for treatment of a variety of diseases. In this review, the published nicotinic agonists are presented and, on the basis of the molecular structure, the compounds are divided into three compound classes, nicotinoids (structurally close to nicotine), bicyclic compounds (structurally close to epibatidine and anatoxin-a), and analogues of imidacloprid (structurally close to the insecticide imidacloprid). The structure-activity relationships are discussed within and in between the classes.

On the basis of computational studies of ligands for the nicotinic acetylcholine receptors the structure-activity relationships are discussed and a possible binding mode suggested. The binding mode encompasses (A) an interaction between an anionic site in the receptor and the protonated nitrogen atom in the ligand, (B) a hydrogen bond between a hydrogen bond donor in the receptor and a hydrogen bond acceptor in the ligand, (C) an interaction between a pi-system (heteroaromatic ring, carbonyl bond) in the ligand and another pi-system or a positively charged amino acid residue in the binding site, (D) a pi-cation interaction between aromatic residues in the receptor binding site and the protonated nitrogen atom in the ligand, and (E) steric interactions of positive and negative character around the aliphatic and the heteroaromatic part of the ligand.
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  • Current Medicinal Chemistry covers all the latest and outstanding developments in medicinal chemistry and rational drug design. Each issue contains a series of timely in-depth reviews written by leaders in the field covering a range of the current topics in medicinal chemistry. Current Medicinal Chemistry is an essential journal for every medicinal chemist who wishes to be kept informed and up-to-date with the latest and most important developments.
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