Recombinant Human TFPI Protein, CF


Recombinant Human TFPI (Catalog # 2974-PI) inhibits trypsincleavage of a fluorogenic peptide substrate, Mca-RPKPVE-Nval-WRK(Dnp)-NH2 (Catalog # ES002).

Product Details

Reactivity HuSpecies Glossary
Applications Inhibition Activity

Order Details

Recombinant Human TFPI Protein, CF Summary

Details of Functionality
Measured by its ability to inhibit trypsin cleavage of a fluorogenic peptide substrate, Mca-RPKPVE-Nval-WRK(Dnp)-NH2 (Catalog # ES002). The IC50 value is <0.75 nM, as measured under the described conditions.
Mouse myeloma cell line, NS0-derived human TFPI protein
Asp29-Lys282, with a C-terminal 10-His tag
Accession #
N-terminal Sequence
Protein/Peptide Type
Recombinant Enzymes
>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.


Theoretical MW
31 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.
41 kDa, reducing conditions
Read Publications using
2974-PI in the following applications:

Packaging, Storage & Formulations

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.
Lyophilized from a 0.2 μm filtered solution in NaH2PO4 and NaCl.
>95%, by SDS-PAGE under reducing conditions and visualized by silver stain.
Reconstitution Instructions
Reconstitute at 100 μg/mL in sterile 25 mM Tris and 150 mM NaCl, pH 7.5.
Assay Procedure
  • Assay Buffer: 50 mM Tris, 10 mM CaCl2, 150 mM NaCl, 0.05% (w/v) Brij-35, pH 7.5 (TCNB)
  • Recombinant Human TFPI1 (rhTFPI1) (Catalog # 2974-PI)
  • Trypsin (Sigma, Catalog # T-1426)
  • Substrate: MCA-Arg-Pro-Lys-Pro-Val-Glu-NVAL-Trp-Arg-Lys(DNP)-NH2 (Catalog # ES002), 2 mM stock in DMSO
  • F16 Black Maxisorp Plate (Nunc, Catalog # 475515)
  • Fluorescent Plate Reader (Model: SpectraMax Gemini EM by Molecular Devices) or equivalent
  1. Dilute Trypsin to 0.25 µg/mL in Assay Buffer.
  2. Prepare a curve of rhTFPI1 (MW: 30,525 Da) in Assay Buffer. Make the following serial dilutions: 500, 100, 50, 30, 20, 10, 5, 2.5, and 0.833 nM.
  3. Combine equal volumes of 0.25 µg/mL Trypsin and rhTFPI1 serial curve dilutions. Include two controls containing equal volumes of Assay Buffer and 0.25 µg/mL Trypsin.
  4. Incubate reaction mixtures at 37 °C for 15 minutes.
  5. Dilute incubated reaction mixtures 5-fold in Assay Buffer.
  6. Dilute Substrate to 20 µM in Assay Buffer.
  7. In a plate, load 50 µL of the diluted reaction mixtures to wells, and start the reaction by adding 50 µL of 20 µM Substrate.
  8. Read at excitation and emission wavelengths of 320 nm and 405 nm (top read), respectively, in kinetic mode for 5 minutes.
  9. Derive the 50% inhibiting concentration (IC50) for rhTFPI1 by plotting RFU/min (or specific activity) vs. concentration with 4-PL fitting.
  10. The specific activity for Trypsin at each point may be determined 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:
  • Trypsin: 0.00125 µg
  • rhTFPI1 curve: 25, 5, 2.5, 1.5, 1.0, 0.5, 0.25, 0.125, and 0.0417 nM
  • Substrate: 10 µM


This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.

Alternate Names for Recombinant Human TFPI Protein, CF

  • convertin
  • EPI
  • Extrinsic pathway inhibitor
  • LACI
  • Lipoprotein-associated coagulation inhibitor
  • TFPI
  • tissue factor pathway inhibitor (lipoprotein-associated coagulation inhibitor)
  • tissue factor pathway inhibitor


Human TFPI, also known as lipoprotein-associated coagulation inhibitor (LACI) and extrinsic pathway inhibitor (EPI), is a physiological inhibitor of extrinsic pathway of coagulation and has biological functions of anticoagulation and anti-inflammation (1). It is a secreted protein with a N-terminal acidic region, three Kunitz (K) domains separated with by two linker regions, and a C-terminal basic region (2). The first K domain (residues 54 to 104) inhibits coagulation factor VIIa complexed to tissue factor (TF). The second K domain (residues 125 to 175) inhibits factor Xa. The third K domain (residues 217 to 267) binds to heparin (3). The C-terminal basic region may have several functions. For example, it plays an important role in binding of TFPI to cell surfaces (2). The purified Recombinant Human TFPI ends at residue 282 and does not contain the last 20 residues (residues 283 to 302) in the C-terminal region. It inhibits the activity of Recombinant Human Coagulation Factor VII (Catalog # 2338-SE) in the presence of Recombinant Human Coagulation Factor III/Tissue Factor (Catalog # 2339-PA).

  1. Bai, H. et al. (2005) Thromb Haemost. 93:1055.
  2. Bajaj, M.S. et al. (2001) Thromb Haemost. 86:959.
  3. Mine, S. et al. (2002) Biochemistry 41:78.

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Gene Symbol TFPI