1nl6

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spinqualitylabelsall models 1nl6, resolution 2.8Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

Crystal Structure Of The Cysteine Protease Human Cathepsin K In Complex With A Covalent Azepanone Inhibitor

Contents 1 Overview 2 Disease 3 About this Structure 4 Reference

Overview

The synthesis, in vitro activities, and pharmacokinetics of a series of, azepanone-based inhibitors of the cysteine protease cathepsin K (EC, 3.4.22.38) are described. These compounds show improved configurational, stability of the C-4 diastereomeric center relative to the previously, published five- and six-membered ring ketone-based inhibitor series., Studies in this series have led to the identification of 20, a potent, selective inhibitor of human cathepsin K (K(i) = 0.16 nM) as well as 24, a, potent inhibitor of both human (K(i) = 0.0048 nM) and rat (K(i,app) = 4.8, nM) cathepsin K. Small-molecule X-ray crystallographic analysis of 20, established the C-4 S stereochemistry as being critical for potent, inhibition and that unbound 20 adopted the expected equatorial, conformation for the C-4 substituent. Molecular modeling studies predicted, the higher energy axial orientation at C-4 of 20 when bound within the, active site of cathepsin K, a feature subsequently confirmed by X-ray, crystallography. Pharmacokinetic studies in the rat show 20 to be 42%, orally bioavailable. Comparison of the transport of the cyclic and acyclic, analogues through CaCo-2 cells suggests that oral bioavailability of the, acyclic derivatives is limited by a P-glycoprotein-mediated efflux, mechanism. It is concluded that the introduction of a conformational, constraint has served the dual purpose of increasing inhibitor potency by, locking in a bioactive conformation as well as locking out available, conformations which may serve as substrates for enzyme systems that limit, oral bioavailability.

Disease

Known disease associated with this structure: Pycnodysostosis OMIM:[601105]

About this Structure

1NL6 is a Single protein structure of sequence from Homo sapiens with 750 as ligand. Active as Cathepsin K, with EC number 3.4.22.38 Full crystallographic information is available from OCA.

Reference

Azepanone-based inhibitors of human and rat cathepsin K., Marquis RW, Ru Y, LoCastro SM, Zeng J, Yamashita DS, Oh HJ, Erhard KF, Davis LD, Tomaszek TA, Tew D, Salyers K, Proksch J, Ward K, Smith B, Levy M, Cummings MD, Haltiwanger RC, Trescher G, Wang B, Hemling ME, Quinn CJ, Cheng HY, Lin F, Smith WW, Janson CA, Zhao B, McQueney MS, D'Alessio K, Lee CP, Marzulli A, Dodds RA, Blake S, Hwang SM, James IE, Gress CJ, Bradley BR, Lark MW, Gowen M, Veber DF, J Med Chem. 2001 Apr 26;44(9):1380-95. PMID:11311061

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