详细说明
- Purity>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
- Endotoxin Level<1.0 EU per 1 μg of the protein by the LAL method.
- ActivityMeasured by its ability to cleave tert-butoxycarbonyl-Gln-Arg-Arg-7-amino-4-methylcoumarin (Boc-QRR-AMC). The specific activity is >8,000 pmol/min/μg, as measured under the described conditions. See Activity Assay Protocol on .
- SourceMouse myeloma cell line, NS0-derived Gln44-Pro416 (Asp160Glu & Arg161Lys), with a C-terminal 10-His tag
- Accession #
- N-terminal Sequence
AnalysisNo results obtained. Gln44 inferred from enzymatic pyroglutamate treatment revealing Ser45 - Predicted Molecular Mass42 kDa
- SDS-PAGE41-47 kDa, reducing conditions
| 9156-SE | | |
| Formulation Supplied as a 0.2 μm filtered solution in Sodium Acetate and NaCl. | ||
| Shipping The product is shipped with dry ice or equivalent. Upon receipt, store it immediately at the temperature recommended below. | ||
| Stability & Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
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Assay Procedure
Materials
- Activation Buffer: 0.1 M Tris, 10 mM CaCl2, 0.15 M NaCl, 0.05% Brij-35, pH 8.0
- Assay Buffer: 50 mM Tris, pH 9.0
- Recombinant Mouse Hepsin (rmHepsin) (Catalog # 9156-SE)
- Substrate: BOC-Gln-Arg-Arg-AMC (Bachem, Catalog # I-1655), 5 mM stock in 50:50 DMSO:Methanol
- F16 Black Maxisorp Plate (Nunc, Catalog # 475515)
- Fluorescent Plate Reader (Model: SpectraMax Gemini EM by Molecular Devices) or equivalent
- Dilute rmHepsin to 100 µg/mL in Activation Buffer.
- Incubate at 37 °C for 24 hours.
- Dilute activated rmHepsin to 0.2 µg/mL in Assay Buffer.
- Dilute Substrate to 200 μM in Assay Buffer.
- Load into a plate 50 μL of 0.2 µg/mL rmHepsin, and start the reaction by adding 50 μL of 200 μM Substrate. Include a Substrate Blank containing 50 μL of Assay Buffer and 50 μL of 200 μM Substrate.
- Read plate at excitation and emission wavelengths of 380 nm and 460 nm, 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 Coumain (AMC) (Sigma, Catalog # A9891).
- rmHepsin: 0.010 μg
- Substrate: 100 μM
Background: Hepsin
Hepsin, also known as TMPRSS1, is an approximately 50 kDa Type II membrane protein with an extracellular serine protease domain. It is primarily expressed in liver as a disulfide linked heterodimer of heavy and light chains (1, 2). Hepsin cleaves and activates Coagulation Factors VII, IX, and XII (3, 4), the pro forms of HGF, MSP, and uPA (4-8), and Prostasin/PRSS8 (9). It also cleaves EGF R and prevents receptor binding of EGF [9]. Its enzymatic activity is inhibited by HAI-1 and HAI-2 (4, 5, 8). Hepsin is overexpressed in various human tumors including prostate and breast (6, 10), and it promotes tumor progression and metastasis (11). It disrupts attachment of epithelial cells to the basement membrane by inducing the breakdown of desmosomal structures (6). Hepsin also binds to Protein X from hepatitis B virus and to pORF3 from hepatitis E virus (12, 13). Within the ECD, mouse Hepsin shares 89% and 98% amino acid (aa) sequence identity with human and rat Hepsin, respectively (2). An alternatively spliced isoform has a 20 aa deletion in the cytoplasmic and transmembrane regions (2).
- References:
- Tsuji, A. et al. (1991) J. Biol. Chem. 266:16948.
- Vu, T.-K.H. et al. (1997) J. Biol. Chem. 272:31315.
- Kazama, Y. et al. (1995) J. Biol. Chem. 270:66.
- Herter, S. et al. (2005) Biochem. J. 390:125.
- Kirchhofer, D. et al. (2005) FEBS Lett. 579:1945.
- Tervonen, T.A. et al. (2016) Oncogene 35:1832.
- Ganesan, R. et al. (2011) Mol. Cancer Res. 9:1175.
- Moran, P. et al. (2006) J. Biol. Chem. 281:30439.
- Chen, M. et al. (2010) Mol. Cell. Biochem. 337:259.
- Dhanasekaran, S.M. et al. (2001) Nature 412:822.
- Li, W. et al. (2009) Cancer Res. 69:8395.
- Zhang, M. et al. (2015) Oncotarget 7:7780.
- Wang, C. et al. (2014) Hepat. Mon. 14:e13902.
- Entrez Gene IDs:3249 (Human); 15451 (Mouse); 29135 (Rat)
- Alternate Names:EC 3.4.21; EC 3.4.21.106; Hepsin; HPN; serine protease hepsin catalytic chain; serine protease hepsin; TMPRSS1 ; TMPRSS1serine protease hepsin non-catalytic chain; Transmembrane protease serine 1; transmembrane protease, serine 1
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