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Human CellExp Cathepsin B, human recombinant protein


Product info
Primary Accession P07858
Calculated MW This protein is fused with a 6×His tag at the C-terminus, has a calculated MW of 36.7 kDa (Pro) and 29 kDa (Mature). The predicted N-terminus is Arg18 (pro) or Phe74 (mature). DTT-reduced Protein migrates as 43 kDa and 34 kDa due to glycosylation.
Additional Info
Gene ID 1508
Gene Symbol CTSB
Other Names CTSB, CPSB, APPS
Gene Source Human
Source HEK293 cells
Assay&Purity SDS-PAGE; ≥95%
Assay2&Purity2 N/A;
Recombinant Yes
Results Measured by its ability to cleave the fluorogenic peptide substrate Z-LR-AMC. Measured in 100 µl reaction mixture containing 25 mM MES, pH 5.0, 0.01 µg rhCathepsin B, and 10 µM reaction substrate. The specific activity is >2800 pmol/min/ µg.
Target/Specificity Cathepsin B
Application Notes Centrifuge the vial prior to opening. Reconstitute in sterile PBS, pH 7.4 to a concentration of 50 µg/ml. Do not vortex. This solution can be stored at 2-8°C for up to 1 month. For extended storage, it is recommended to store at -20°C.
Format Lyophilized
Storage -20°C; Lyophilized from 0.22 µm filtered solution in 50 mM Tris-HCl and 150 mM NaCl, pH 8.0. Generally 5-8% Mannitol or trehalose is added as a protectant before lyophilization.
Citations (0)

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Cathepsin B (CTSB) also known as APP secretase (APPS) and CPSB, is an enzymatic protein belonging to the peptidase C1 family. Cathepsin B / CTSB is synthesized as a preproenzyme. Following removal of the signal peptide, the inactive proenzyme undergoes further modifications including removal of the pro region to result in the active enzyme. The catalytic activity of Cathepsin B / APPS contains: Hydrolysis of proteins with broad specificity for peptide bonds; preferentially cleaves -Arg-Arg-|-Xaa bonds in small molecule substrates (thus differing from cathepsin L); In addition to being an endopeptidase, shows peptidyl-dipeptidase activity, liberating C-terminal dipeptides. As a thiol protease, cathepsin B / CPSB is believed to participate in intracellular degradation and turnover of proteins and has also been implicated in tumor invasion and metastasis. Overexpression of cathepsin B has been associated with esophageal adenocarcinoma and other tumors.


Chan S.J.,et al.Proc. Natl. Acad. Sci. U.S.A. 83:7721-7725(1986).
Cao L.,et al.Gene 139:163-169(1994).
Ota T.,et al.Nat. Genet. 36:40-45(2004).
Otsuki T.,et al.DNA Res. 12:117-126(2005).
Mural R.J.,et al.Submitted (JUL-2005) to the EMBL/GenBank/DDBJ databases.

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$ 215.00
Cat# PBV11030r
(40 western blots)
Availability: 5-7days
Bulk Size
Seasonal Special on Bulk Order
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