Dual-site binding of bivalent 4-aminopyridine- and 4-aminoquinoline- based AChE inhibitors: Contribution of the hydrophobic alkylene tether to monomer and dimer affinities

Yi Fan Han, Crystal P L Li, Ella Chow, Hong Wang, Yuan-Ping Pang, Paul R. Carlier

Research output: Contribution to journalArticle

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Abstract

Three series of 4-aminopyridine-and 4-aminoquinoline based symmetrical bivalent acetylcholinesterase (AChE) inhibitors were prepared and compared to previously synthesized dimers of 9-amino-1,2,3,4-tetrahydroacridine (tacrine). In each case significant, tether length-dependent increases in AChE inhibition potency and selectivity (up to 3000-fold) were observed relative to the corresponding monomer, indicating dual-site binding of these inhibitors to AChE. Assay of the corresponding alkylated monomers revealed that the alkylene tether played at least two complementary roles in the dimer series. In addition to reducing the entropy loss that occurs on binding both monomeric units of the dimer, the alkylene tether can also significantly improve potency through hydrophobic effects. (C) 1999 Elsevier Science Ltd.

Original languageEnglish (US)
Pages (from-to)2569-2575
Number of pages7
JournalBioorganic and Medicinal Chemistry
Volume7
Issue number11
DOIs
StatePublished - Nov 1999

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ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Organic Chemistry
  • Drug Discovery
  • Pharmaceutical Science

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