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pubmed-article:17985862pubmed:abstractTextFragment-based lead generation has led to the discovery of a novel series of cyclic amidine-based inhibitors of beta-secretase (BACE-1). Initial fragment hits with an isocytosine core having millimolar potency were identified via NMR affinity screening. Structure-guided evolution of these fragments using X-ray crystallography together with potency determination using surface plasmon resonance and functional enzyme inhibition assays afforded micromolar inhibitors. Similarity searching around the isocytosine core led to the identification of a related series of inhibitors, the dihydroisocytosines. By leveraging the knowledge of the ligand-BACE-1 recognition features generated from the isocytosines, the dihydroisocytosines were efficiently optimized to submicromolar potency. Compound 29, with an IC50 of 80 nM, a ligand efficiency of 0.37, and cellular activity of 470 nM, emerged as the lead structure for future optimization.lld:pubmed
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pubmed-article:17985862pubmed:articleTitleApplication of fragment-based lead generation to the discovery of novel, cyclic amidine beta-secretase inhibitors with nanomolar potency, cellular activity, and high ligand efficiency.lld:pubmed
pubmed-article:17985862pubmed:affiliationCNS Discovery Research, AstraZeneca Pharmaceuticals LP, 1800 Concord Pike, Wilmington, DE 19850-5437, USA. philip.edwards@astrazeneca.comlld:pubmed
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