Procathepsin K, Human, Recombinant, E. coli

Note: 1 mU = 1 milliunit.

Recombinant, human procathepsin K (amino acids 19-329) (GenBank target symbol = S79895, ACC No. P43235) expressed in E. coli with a methionine residue inserted at amino acid 18 to create a new N-terminal initiation site. Cathepsin K, a member of the papain superfamily of cysteine proteinases, plays an important role in osteoclast-mediated bone resorption and collagen degradation. Cathepsin K is synthesized as an inactive proenzyme that is converted to its mature, active form by proteolytic cleavage of the 99 amino acid propeptide domain. Inhibitors of cathepsin K include leupeptin (Cat. No. 108975) (IC₅₀ = 70 nM), E-64 (Cat. No. 324890) (IC₅₀ = 5 nM), and cystatin (Cat. No. 324891 or 324896). Requires activation prior to use.

Please refer to vial label for lot-specific concentration.

In 500 mM NaCl, 25 mM Tris, pH 8.0.

Following initial thaw, aliquot and freeze (-70°C). Following activation the enzyme is unstable and should include MMTS for storage (see recommended reaction conditions for activation).

McQueney, M., et al. 1997. J. Bio. Chem.272, 13955.
Bossard, M., et al. 1996. J. Biol. Chem.271, 12517.
Drake, F., et al. 1996. J. Biol. Chem.271, 12511.
Bromme, D. and Okamoto, K. 1995. Biol. Chem. Hoppe-Seyler376, 379.
Baron, R. 1989 Anat. Rec.224, 317.
Littlewood-Evans, A.J., et al. 1975. Cancer Res.57, 5386.
Nishimura, J.S. et al. 1975. Arch. Biochem. Biophys.170, 461.

One unit is defined as the amount of enzyme that will hydrolyze 1 µmole benzyloxycarbonyl-phenylalanine-arginine-7-amido-4-methylcoumarin per min at 37°C, pH 5.5.

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Toxicity: Standard Handling (A)