Recombinant Human Neprilysin (CHO-expressed) Protein, CF Summary
Details of Functionality
Measured by its ability to cleave the fluorogenic peptide substrate, Mca-RPPGFSAFK(Dnp)-OH (Catalog # ES005). The specific activity is >1,500 pmol/min/µg, as measured under the described conditions.
Source
Chinese Hamster Ovary cell line, CHO-derived human Neprilysin/CD10 protein Tyr52-Trp750 , with an N-terminal 6-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
81 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
102 kDa, reducing conditions
Publications
Read Publications using 1182-ZNC 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, NaCl and ZnCl2.
Purity
>95%, by SDS-PAGE under reducing conditions and visualized by silver stain
Assay Procedure
Assay Buffer: 50 mM Tris, 0.05% Brij-35, pH 9.0
Recombinant Human Neprilysin (rhNeprilysin) (Catalog # 1182-ZNC)
Substrate: MCA-Arg-Pro-Pro-Gly-Phe-Ser-Ala-Phe-Lys(DNP)-OH (Catalog # ES005), Prepare 2 mM stock in DMSO
F16 Black Maxisorp Plate (Nunc, Catalog # 475515)
Fluorescent Plate Reader (Model: SpectraMax Gemini EM by Molecular Devices) or equivalent
Dilute rhNeprilysin to 0.1 µg/mL in Assay Buffer.
Dilute fluorogenic peptide Substrate to 20 µM in Assay Buffer.
Load in a black well plate 50 µL of 0.1 µg/mL of rhNeprilysin (5 ng/well), and start the reaction by adding 50 µL of 20 µM Substrate. As a Substrate Blank combine 50 µL of Substrate and 50 µL of Assay Buffer.
Read at excitation and emission wavelengths of 320 nm and 405 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 MCA-Pro-Leu-OH (Bachem, Catalog # M-1975) Per Well:
rhNeprilysin: 0.005 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 Human Neprilysin (CHO-expressed) Protein, CF
Neprilysin/CD10, also known as NEP and neutral endopeptidase 24.11, is a zinc metallopeptidase expressed at the cell surface of a variety of cells. The enzyme functions both as an endopeptidase with a thermolysin-like specificity and as a dipeptidylcarboxypeptidase. NEP has been shown to be involved in the degradation of enkephalins in the mammalian brain and the inactivation of circulating atrial natriuretic peptide (1, 2). NEP has also been identified as the common acute lymphocytic leukemia antigen (CALLA), and is expressed on the surface of lymphocytes in some disease states (3, 4). These and other observations have resulted in considerable interest in NEP as a target for analgesics and antihypertensive drugs. NEP is also a major degrading enzyme of amyloid beta peptide (A beta ) in the brain, indicating that down-regulation of NEP activity, which could be caused by aging, can contribute to the development of Alzheimer’s disease by promoting A beta accumulation (5).
Malfroy, B. et al. (1978) Nature 276:523.
Kenny, A.J. and Stephenson, S.L. (1988) FEBS Lett. 232:1.
LeTarte, M. et al. (1988) J. Exp. Med. 168:1247.
Shipp, M.A. et al. (1988) Proc. Natl. Acad. Sci. USA 85:4819.
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