7qbn
From Proteopedia
Structure of cathepsin K in complex with the azadipeptide nitrile inhibitor Gu1303
Structural highlights
Disease[CATK_HUMAN] Defects in CTSK are the cause of pycnodysostosis (PKND) [MIM:265800]. PKND is an autosomal recessive osteochondrodysplasia characterized by osteosclerosis and short stature.[1] [2] [3] [4] Function[CATK_HUMAN] Closely involved in osteoclastic bone resorption and may participate partially in the disorder of bone remodeling. Displays potent endoprotease activity against fibrinogen at acid pH. May play an important role in extracellular matrix degradation. Publication Abstract from PubMedCathepsin K (CatK) is a target for the treatment of osteoporosis, arthritis, and bone metastasis. Peptidomimetics with a cyanohydrazide warhead represent a new class of highly potent CatK inhibitors; however, their binding mechanism is unknown. We investigated two model cyanohydrazide inhibitors with differently positioned warheads: an azadipeptide nitrile Gu1303 and a 3-cyano-3-aza-beta-amino acid Gu2602. Crystal structures of their covalent complexes were determined with mature CatK as well as a zymogen-like activation intermediate of CatK. Binding mode analysis, together with quantum chemical calculations, revealed that the extraordinary picomolar potency of Gu2602 is entropically favoured by its conformational flexibility at the nonprimed-primed subsites boundary. Furthermore, we demonstrated by live cell imaging that cyanohydrazides effectively target mature CatK in osteosarcoma cells. Cyanohydrazides also suppressed the maturation of CatK by inhibiting the autoactivation of the CatK zymogen. Our results provide structural insights for the rational design of cyanohydrazide inhibitors of CatK as potential drugs. Highly potent inhibitors of cathepsin K with a differently positioned cyanohydrazide warhead: structural analysis of binding mode to mature and zymogen-like enzymes.,Benysek J, Busa M, Rubesova P, Fanfrlik J, Lepsik M, Brynda J, Matouskova Z, Bartz U, Horn M, Gutschow M, Mares M J Enzyme Inhib Med Chem. 2022 Dec;37(1):515-526. doi:, 10.1080/14756366.2021.2024527. PMID:35144520[5] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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