2p4j
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Crystal structure of beta-secretase bond to an inhibitor with Isophthalamide Derivatives at P2-P3
OverviewOverview
Structure-based design and synthesis of a number of potent and selective, memapsin 2 inhibitors are described. These inhibitors were designed based, upon the X-ray structure of memapsin 2-bound inhibitor 3 that incorporates, methylsulfonyl alanine as the P2-ligand and a substituted pyrazole as the, P3-ligand. Of particular importance, we examined the ability of the, substituted isophthalic acid amide derivative to mimic the key, interactions in the S2-S3 regions of the enzyme active sites of 3-bound, memapsin 2. We investigated various substituted phenylethyl, alpha-methylbenzyl, and oxazolylmethyl groups as the P3-ligands. A number, of inhibitors exhibited very potent inhibitory activity against mempasin 2, and good selectivity against memapsin 1. Inhibitor 5d has shown low, nanomolar enzyme inhibitory potency (Ki=1.1 nM) and very good cellular, inhibitory activity (IC50=39 nM). Furthermore, in a preliminary study, inhibitor 5d has shown 30% reduction of Abeta40 production in transgenic, mice after a single intraperitoneal administration (8 mg/kg). A, protein-ligand X-ray crystal structure of 5d-bound memapsin 2 provided, vital molecular insight that can serve as an important guide to further, design of novel inhibitors.
About this StructureAbout this Structure
2P4J is a Single protein structure of sequence from Homo sapiens with as ligand. Active as Memapsin 2, with EC number 3.4.23.46 Full crystallographic information is available from OCA.
ReferenceReference
Design, synthesis, and X-ray structure of potent memapsin 2 (beta-secretase) inhibitors with isophthalamide derivatives as the P2-P3-ligands., Ghosh AK, Kumaragurubaran N, Hong L, Kulkarni SS, Xu X, Chang W, Weerasena V, Turner R, Koelsch G, Bilcer G, Tang J, J Med Chem. 2007 May 17;50(10):2399-407. Epub 2007 Apr 14. PMID:17432843
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