Recombinant Mouse Prostasin/Prss8 Protein, CF

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Recombinant Mouse Prostasin/Prss8 Protein, CF Summary

Product Specifications

>95%, by SDS-PAGE under reducing conditions and visualized by silver stain
Endotoxin Level
<1.0 EU per 1 μg of the protein by the LAL method.
Measured by its ability to cleave the fluorogenic peptide substrate Boc-QAR-AMC (Catalog # ES014). The specific activity is >15 pmol/min/µg, as measured under the described conditions.
Mouse myeloma cell line, NS0-derived mouse Prostasin/Prss8 protein
Ala30-Gln289 with an N-terminal signal sequence and a C-terminal 10-His tag
Accession #
N-terminal Sequence
Ala30 & Ile45
Predicted Molecular Mass
29 kDa & 28 kDa
37-39 kDa, reducing conditions

Product Datasheets

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Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.


Formulation Supplied as a 0.2 μm filtered solution in Tris, NaCl and CaCl2.
Shipping The product is shipped with polar packs. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage: 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.

Assay Procedure

  • Assay Buffer: 50 mM Tris, 0.05% (w/v) Brij-35, pH 9.0
  • Recombinant Mouse Prostasin/Prss8 (rmProstasin) (Catalog # 2968-SE)
  • Substrate: BOC-Gln-Ala-Arg-AMC (Catalog # ES014)
  • F16 Black Maxisorp Plate (Nunc, Catalog # 475515)
  • Fluorescent Plate Reader (Model: SpectraMax Gemini EM by Molecular Devices) or equivalent
  1. Dilute rmProstasin to 20 µg/mL in Assay Buffer.
  2. Dilute Substrate to 200 µM in Assay Buffer.
  3. Load into a black well plate 50 µL of 20 µg/mL rmProstasin and start the reaction by adding 50 µL of 200 µM Substrate. As a Substrate Blank combine 50 µL of Assay Buffer and 50 µL of 200 µM Substrate.
  4. Read at excitation and emission wavelengths of 380 nm and 460 nm (top read), respectively, in kinetic mode for 5 minutes.
  5. Calculate specific activity:

     Specific Activity (pmoles/min/µg) =

Adjusted Vmax* (RFU/min) x Conversion Factor** (pmole/RFU)
amount of enzyme (µg)

     *Adjusted for Substrate Blank
     **Derived using calibration standard 7-amino, 4-Methyl Coumarin (Sigma, Catalog # A-9891).

Per Well:
  • rmProstasin: 1 µg
  • Substrate: 100 µM
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Background: Prostasin/Prss8

Prostasin encoded by the Prss8 gene, also known as channel activating protease 1, is a serine protease with a trypsin-like substrate specificity (1, 2). The preproenzyme possesses a C-terminal membrane-spanning domain that can be proteolytically processed to generate a secreted form of the enzyme. The secreted form of prostasin has been purified from seminal fluid (2). Prostasin is highly expressed in the prostate gland, and is expressed at lower levels in the lung, kidney, liver, salivary gland, and pancreas (3). The peptidase activity of prostasin is involved in the regulation of epithelial sodium channels (4, 5). Secreted from NS0 cells as the active form, the purified recombinant mouse (rm) Prostasin most likely consists of a disulfide bond-linked two chains with N-terminal sequences of I45TGGGSAKPG and A30DGTE, respectively (3). The enzymatic activity of rmProstasin is effectively inhibited by rmHAI-1 and rmHAI‑2B (Catalog # 1141-PI and 1107-PI).

  1. Vuagniaux, G. et al. (2000) J. Am. Soc. Nephrol. 11:828.
  2. Yu J.X. et al. (1994) J. Biol. Chem. 269:18843.
  3. Yu J.X. et al. (1995) J. Biol. Chem. 270:13483.
  4. Caldwell R.A. et al. (2004) Am. J. Physiol. Cell Physiol. 286:C190.
  5. Tong Z. et al. (2004) Am. J. Physiol. Lung Cell Mol. Physiol. 287:L928.
Entrez Gene IDs
5652 (Human); 76560 (Mouse)
Alternate Names
CAP1; channel-activating protease 1; EC 3.4.21; EC 3.4.21.-; EC; Prostasin; protease, serine, 8; Prss8; Serine protease 8

Citations for Recombinant Mouse Prostasin/Prss8 Protein, CF

R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.

2 Citations: Showing 1 - 2
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  1. Mutational tail loss is an evolutionary mechanism for liberating marapsins and other type I serine proteases from transmembrane anchors.
    Authors: Raman K, Trivedi N, Raymond W, Ganesan R, Kirchhofer D, Verghese G, Craik C, Schneider E, Nimishakavi S, Caughey G
    J Biol Chem, 2013-02-27;288(15):10588-98.
    Species: Mouse
    Sample Types: Recombinant Protein
    Applications: Enzyme Assay
  2. Structure of human prostasin, a target for the regulation of hypertension.
    Authors: Rickert KW, Kelley P, Byrne NJ, Diehl RE, Hall DL, Montalvo AM, Reid JC, Shipman JM, Thomas BW, Munshi SK, Darke PL, Su HP
    J. Biol. Chem., 2008-10-14;283(50):34864-72.
    Species: Human
    Sample Types:
    Applications: Enzyme Assay


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