Measured by its ability to inhibit human MMP-2 cleavage of a fluorogenic peptide substrate Mca-PLGL-Dpa-AR-NH2 (Catalog # ES001). The IC50 value is approximately 3 nM, under conditions the described conditions.
Source
Mouse myeloma cell line, NS0-derived human TIMP-3 protein Cys24-Pro211
>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Endotoxin Note
<1.0 EU per 1 μg of the protein by the LAL method.
Applications/Dilutions
Dilutions
Inhibition Activity
Theoretical MW
22 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
26 kDa, reducing conditions
Publications
Read Publications using 973-TM 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 reconstitution.
Buffer
Lyophilized from a 0.2 μm filtered solution in Tris and NaCl.
Purity
>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Reconstitution Instructions
Reconstitute at 100 μg/mL in sterile, deionized water.
Assay Procedure
Assay Buffer: 50 mM Tris, 10 mM CaCl2, 150 mM NaCl, 0.05% Brij-35 (v/v), pH 7.5 (TCNB)
Recombinant Human TIMP-3 (rhTIMP-3) (Catalog # 973-TM)
Recombinant Human MMP‑2 (rhMMP‑2) (Catalog # 902-MP)
4-Aminophenylmercuric acetate (APMA), 100 mM stock in DMSO
Substrate: MCA-Pro-Leu-Gly-Leu-DPA-Ala-Arg-NH2 ((Catalog # ES001) ), 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 rhMMP-2 to 100 µg/mL in Assay Buffer.
Activate 100 µg/mL rhMMP-2 with 1 mM APMA.
Incubate at 37 °C for 1 hour.
Prepare a curve of rhTIMP-3 (MW: 21,700 Da) in Assay Buffer. Make serial dilutions of: 5,000, 2,000, 1,000, 500, 300, 200, 150, 100, 20, and 2 nM.
After activation, dilute 100 µg/mL rhMMP-2 to 12.5 µg/mL in Assay Buffer.
Mix 16 µL of rhTIMP-3 curve dilutions, 25.6 µL of diluted rhMMP-2, and 118.4 µL of Assay Buffer.
Include a control (in duplicate) containing Assay Buffer and the diluted rhMMP-2.
Incubate reactions for 2 hours at 37 °C.
After incubation, dilute the mixtures 5 fold in Assay Buffer.
Dilute Substrate to 10 µM in Assay Buffer.
Load 50 µL of the diluted incubated mixtures in a plate, and start the reaction by adding 50 µL of 10 µM Substrate.
Read at excitation and emission wavelengths of 320 nm and 405 nm (top read), respectively in kinetic mode for 5 minutes.
Derive the IC50 value for rhTIMP-3 from the curve.
Calculate specific activity for each point using the following formula (if needed):
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:
rhMMP-2: 0.020 µg
Substrate: 5 µM
Notes
This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.
Alternate Names for Recombinant Human TIMP-3 Protein, CF
HSMRK222
K222
K222TA2
metalloproteinase inhibitor 3
MIG-5 protein
Protein MIG-5
pseudoinflammatory)
SFD
TIMP metallopeptidase inhibitor 3
TIMP3
TIMP-3
tissue inhibitor of metalloproteinase 3 (Sorsby fundus dystrophy
Tissue inhibitor of metalloproteinases 3
Background
Tissue inhibitors of metalloproteinases (TIMPs) are a family of proteins that regulate the activation and proteolytic activity of the zinc enzymes known as matrix metalloproteinases (MMPs). There are four members of the family, TIMP-1, TIMP-2, TIMP-3 and TIMP-4. TIMP-3 is a glycoprotein with a molecular mass of 30 kDa produced by a wide range of cell types. TIMP-3 inhibits active MMP-mediated proteolysis by forming a non-covalent binary complex with the MMP active site through its N-terminal domain. In addition, TIMP-3 is the only known member of the TIMP family that is an effective inhibitor of ADAMs such as TACE (1).
TIMP-3 is unique among the TIMPs because of its high affinity for binding to the extracellular matrix (2). Point mutations in the TIMP-3 C-terminal domain have been reported to result in Sorsby's fundus dystrophy, a disease leading to macular degeneration and loss of vision.
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