Measured by its ability to cleave the fluorogenic peptide substrate Z-LR-AMC (Catalog # ES008). The specific activity is >5,000 pmol/min/µg, as measured under the described conditions.
Source
Mouse myeloma cell line, NS0-derived mouse Cathepsin L protein Thr18-Asn334, with a C-terminal 10-His tag
>95%, by SDS-PAGE under reducing conditions and visualized by silver stain.
Endotoxin Note
<1.0 EU per 1 μg of the protein by the LAL method.
Applications/Dilutions
Dilutions
Enzyme Activity
Theoretical MW
37 kDa. Disclaimer note: The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors.
SDS-PAGE
35-40 kDa, reducing conditions
Publications
Read Publications using 1515-CY in the following applications:
Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
6 months from date of receipt, -20 to -70 °C as supplied.
3 months, -20 to -70 °C under sterile conditions after opening.
Buffer
Supplied as a 0.2 μm filtered solution in Tris and NaCl.
Purity
>95%, by SDS-PAGE under reducing conditions and visualized by silver stain.
Assay Procedure
Activation Buffer: 50 mM Sodium Citrate, 150 mM NaCl, 1 mM EDTA, 0.615% CHAPS, pH 3.0
Assay Buffer: 25 mM MES, 5 mM DTT, pH 6.0
Recombinant Mouse Cathepsin L (rmCathepsin L) (Catalog # 1515-CY)
Substrate: Z-Leu-Arg-AMC (Catalog # ES008), 10 mM stock in DMSO
F16 Black Maxisorp Plate (Nunc, Catalog # 475515)
Fluorescent Plate Reader (Model: SpectraMax Gemini EM by Molecular Devices) or equivalent
Activate rmCathepsin L at 100 µg/mL in Activation Buffer.
Incubate at room temperature for 60 minutes.
Dilute activated rmCathepsin L to 0.05 ng/µL in Assay Buffer.
Dilute Substrate to 20 µM in Assay Buffer.
In a plate load 50 µL of 0.05 ng/µL rmCathepsin L to wells, and start the reaction by adding 50 µL of 20 µM Substrate. Include a Substrate Blank containing of 50 µL Assay Buffer and 50 µL of 20 µM Substrate.
Read at excitation and emission wavelengths of 380 nm and 460 nm (top read), respectively, in kinetic mode for 5 minutes.
Calculate specific activity:
Specific Activity (pmol/min/µg) =
Adjusted Vmax* (RFU/min) x Conversion Factor** (pmol/RFU)
amount of enzyme (µg)
*Adjusted for Substrate Blank **Derived using calibration standard 7-Amino, 4-Methyl Coumarin (AMC) (Sigma, Catalog # A-9891)
Per Well:
rmCathepsin L: 0.0025 µg
Substrate: 10 µM
Notes
This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.
Alternate Names for Recombinant Mouse Cathepsin L Protein, CF
Cathepsin L
cathepsin L1
CATL
CTSL
CTSL1
CTSLEC 3.4.22.15
EC 3.4.22
FLJ31037
Major excreted protein
MEP
Background
Cathepsin L is a lysosomal cysteine protease expressed in most eukaryotic cells. Cathepsin L is known to hydrolyze a number of proteins, including the proform of urokinase‑type plasminogen activator, which is activated by Cathepsin L cleavage (1). Cathepsin L has also been shown to proteolytically inactivate alpha 1-antitrypsin and secretory leucoprotease inhibitor, two major protease inhibitors of the respiratory tract (2). These observations, combined with the demonstration of increased Cathepsin L activity in the epithelial lining fluid of the lungs of emphysema patients, have led to the suggestion that the enzyme may be involved in the progression of this disease. Cathepsin L has also been identified as a major excreted protein of transformed fibroblasts, indicating the enzyme could be involved in malignant tumor growth (3). In Cathepsin L‑deficient mice, it appears to play a critical role in cardiac morphology and function, epidermal homeostasis, regulation of the hair cycle, and MHC class II‑mediated antigen presentation in cortical epithelial cells of the thymus (4, 5). Mouse Cathepsin L is synthesized as a 334 amino acid precursor with a signal peptide (residues 1‑17), a pro region (residues 18‑113) and a mature chain (residues 114‑334).
Goretzki, L. et al. (1992) FEBS Lett. 297:112.
Taggart, C.C. et al. (2001) J. Biol. Chem. 276:33345.
Gottesman, M.M. and F. Cabral (1981) Biochemistry 20:1659.
Stypmann, J. et al. (2002) Proc. Natl. Acad. Sci. USA 99: 6234.
The concentration calculator allows you to quickly calculate the volume, mass or concentration of your vial. Simply enter your mass, volume, or concentration values for your reagent and the calculator will determine the rest.
=
÷
Review this Product
Be the first to review our Recombinant Mouse Cathepsin L Protein, CF and receive a gift card or discount.