Binding of 13-amidohuprines to acetylcholinesterase: Exploring the ligand-induced conformational change of the Gly117-Gly118 peptide bond in the oxyanion hole

Pelayo Camps, Elena Gómez, Diego Muñoz-Torrero, Albert Badia, Maria Victòria Clos, Carles Curutchet, Jordi Muñoz-Muriedas, Francisco Javier Luque

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17 Citations (Scopus)

Abstract

The acetylcholinesterase (AChE) inhibitory activity of a series of 13-amido derivatives of huprine Y, designed to enlarge the occupancy of the catalytic binding site by mimicking the piridone moiety present in (-)-huperzine A, has been assessed. Although both 13-formamido and 13-methanesulfonamido derivatives are more potent human AChE inhibitors than tacrine and (-)-huperzine A, none of them equals the potency of huprine Y. Molecular modeling studies show that the two derivatives effectively trigger the Gly117-Gly118 conformational flip induced upon binding of (-)-huperzine A, leading to a similar pattern of interactions as that formed by the pyridone amido group of (-)-huperzine A. The detrimental effect on the binding affinity relative to the 13-unsubstituted huprine could be ascribed to a sizable deformation cost associated with the ligand-induced peptide flip. This finding can be interpreted as a mechanism selected by evolution to ensure the preorganization of the functionally relevant oxyanion hole in the binding site of AChE, where residues Gly117 and Gly118 play a relevant role in mediating substrate recognition. © 2006 American Chemical Society.
Original languageEnglish
Pages (from-to)6833-6840
JournalJournal of Medicinal Chemistry
Volume49
DOIs
Publication statusPublished - 16 Nov 2006

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