Recombinant Mouse Tryptase-5/Prss32 Protein, CF Summary
Details of Functionality |
Measured by its ability to cleave a colorimetric peptide substrate, N-carbobenzyloxy-Arg-ThioBenzyl ester (Z-R-SBzl), in the presence of 5,5’Dithio-bis (2-nitrobenzoic acid) (DTNB). Edwards, K.M. et al. (1999) J. Biol. Chem. 274:30468. The specific activity is >400 pmol/min/µg, as measured under the described conditions. |
Source |
Mouse myeloma cell line, NS0-derived mouse Tryptase-5/Prss32 protein Ser20-Arg304, with a C-terminal 10-His tag |
Accession # |
|
N-terminal Sequence |
Ser20 |
Structure / Form |
Pro form |
Protein/Peptide Type |
Recombinant Enzymes |
Gene |
Prss32 |
Purity |
>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 |
|
Theoretical MW |
32 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 |
40 kDa doublet, reducing conditions |
Packaging, Storage & Formulations
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 reconstitution.
|
Buffer |
Lyophilized from a 0.2 μm filtered solution in MES and NaCl. |
Purity |
>95%, by SDS-PAGE under reducing conditions and visualized by silver stain. |
Reconstitution Instructions |
Reconstitute at 200 μg/mL in sterile 50 mM Tris, 10 mM CaCl2, 150 mM NaCl and 0.05% Brij-35 pH 7.5. |
Assay Procedure |
- Activation Buffer: (TCNB) 50 mM Tris, 0.15 M NaCl, 10 mM CaCl2, 0.05% Brij-35, pH 7.5
- Assay Buffer: 50 mM Tris, 0.25 M NaCl, pH 8.0
- Recombinant Mouse Tryptase‑5/Prss32 (rmTPS-5) (Catalog # 2634-SE)
- Bacterial Thermolysin (Thermolysin) (Catalog # 3097-ZN)
- 1,10 Phenanthroline (Sigma, Catalog # 320056), 0.6 M stock in DMSO
- Substrate: Z-Arg-SBzl (SM Biochemicals, Catalog # SMSB01), 10 mM stock in DMSO
- 5,5’Dithio-bis(2-nitrobenzoic acid) (DTNB) (Sigma Catalog # D-8130)
- 96-well Clear Plate (Costar, Catalog # 92592)
- Plate reader (Model: SpectraMax Plus by Molecular Devices) or equivalent
- Dilute rmTPS-5 to 100 µg/mL with Activation Buffer.
- Dilute Thermolysin to 0.4 µg/mL with Activation Buffer.
- Mix equal volumes of 100 µg/mL rmTPS-5 and 0.4 µg/mL Thermolysin for final concentrations of 50 µg/mL and 0.2 µg/mL, respectively.
- Incubate at 37 °C for 1 hour.
- Stop the reaction with 10 mM 1,10 Phenanthroline.
- Dilute activated rmTPS-5 to 4 ng/µL in Assay Buffer.
- Dilute Substrate to 200 µM in Assay Buffer with 200 µM of DTNB.
- Load 50 µL of the 4 ng/µL rmTPS-5 in a clear plate and start the reaction by adding 50 µL of the Substrate/DTNB mixture to wells. Include a Substrate Blank containing 50 µL Assay Buffer and 50 µL Substrate mix without any rmTPS-5.
- Read at 405 nm (Absorbance), in kinetic mode for 5 minutes.
- Calculate specific activity:
Specific Activity (pmol/min/µg) = |
Adjusted Vmax* (OD/min) x well volume (L) x 1012 pmol/mol |
ext. coeff** (M-1cm-1) x path corr.*** (cm) x amount of enzyme (µg) | *Adjusted for Substrate Blank **Using the extinction coefficient 13260 M -1cm -1 ***Using the path correction 0.32 cm Note: the output of many spectrophotometers is in mOD Per Well:
- rmTPS-5: 0.20 µg
- DTNB: 100 µM
- Substrate: 100 µM
|
Notes
This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.
Alternate Names for Recombinant Mouse Tryptase-5/Prss32 Protein, CF
Background
Tryptase-5 is encoded by Prss32, one of 13 genes on mouse chromosome 17A3.3 that correspond to functional trypsin-like serine proteases (1). The deduced amino acid sequence of mouse Tryptase-5 consists of 331 residues with a signal peptide (residues 1 to 19), a pro region (residue 20 to 53), a catalytic domain (54 to 304), and a C-terminal hydrophobic peptide (residues 305 to 331). The mRNA is expressed in smooth muscle, eye, stomach, uterus and lymph node. Apparently, Prss32 does not seem to have a counterpart in the human genome. The mouse Tryptase-5 (residues 20 to 304) was expressed in the NS0 cells with a foreign signal peptide. The protein was secreted and purified. After being treated by thermolysin, the enzyme is active against a peptide substrate as described in the Activity Assay Protocol.
- Wong, G. W. et al. (2004) J. Biol. Chem. 279:2438.
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