| Structural highlights
1nl6 is a 2 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
| | Ligands: |
| | Related: | 1atk, 1au0, 1au2, 1au3, 1au4 |
| Activity: | Cathepsin K, with EC number 3.4.22.38 |
| Resources: | FirstGlance, OCA, RCSB, PDBsum |
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.
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
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.
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[5]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Gelb BD, Shi GP, Chapman HA, Desnick RJ. Pycnodysostosis, a lysosomal disease caused by cathepsin K deficiency. Science. 1996 Aug 30;273(5279):1236-8. PMID:8703060
- ↑ Gelb BD, Willner JP, Dunn TM, Kardon NB, Verloes A, Poncin J, Desnick RJ. Paternal uniparental disomy for chromosome 1 revealed by molecular analysis of a patient with pycnodysostosis. Am J Hum Genet. 1998 Apr;62(4):848-54. PMID:9529353 doi:S0002-9297(07)60977-X
- ↑ Ho N, Punturieri A, Wilkin D, Szabo J, Johnson M, Whaley J, Davis J, Clark A, Weiss S, Francomano C. Mutations of CTSK result in pycnodysostosis via a reduction in cathepsin K protein. J Bone Miner Res. 1999 Oct;14(10):1649-53. PMID:10491211
- ↑ Haagerup A, Hertz JM, Christensen MF, Binderup H, Kruse TA. Cathepsin K gene mutations and 1q21 haplotypes in at patients with pycnodysostosis in an outbred population. Eur J Hum Genet. 2000 Jun;8(6):431-6. PMID:10878663 doi:10.1038/sj.ejhg.5200481
- ↑ 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. Azepanone-based inhibitors of human and rat cathepsin K. J Med Chem. 2001 Apr 26;44(9):1380-95. PMID:11311061
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