Journal
JOURNAL OF MEDICINAL CHEMISTRY
Volume 47, Issue 21, Pages 5049-5056Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jm0400799
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Cathepsin K, a lysosomal cysteine protease of the papain superfamily, is abundantly and selectively expressed in osteoclasts, suggesting that this enzyme is crucial for bone resorption. Prevention of osteoclast-mediated bone resorption via inhibition of cathepsin K could be an effective approach to prevent osteoporosis. Potent and selective reversible ketoamide-based inhibitors have been identified in the present study. Using a known crystal structure of a ketoamide-based inhibitor, information from residues that form the P2/P3 pocket was used in the design of inhibitors that could allow for gains in selectivity and potency. Further, incorporation of P' selective heterocycles, along with the P2/P3 modifications, is also described. These modifications have resulted in potent and selective cathepsin K inhibitors that allow for improvements in their physiochemical properties and represent a viable lead series for the discovery of new therapies for the prevention and treatment of osteoporosis.
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