Recombinant Human t-Plasminogen Activator/tPA Protein, CF

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Recombinant Human t-Plasminogen Activator/tPA Protein Enzyme Activity
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Recombinant Human t-Plasminogen Activator/tPA Protein, CF Summary

Product Specifications

>85%, by SDS-PAGE under reducing conditions and visualized by Colloidal Coomassie® Blue stain at 5 μg per lane.
Endotoxin Level
<1.0 EU per 1 μg of the protein by the LAL method.
Measured by its ability to cleave a peptide substrate, N-carbobenzyloxy-Gly-Gly-Arg-7-amido-4-methylcoumarin (Z-GGR-AMC). The specific activity is >190 pmol/min/μg, as measured under the described conditions.
Chinese Hamster Ovary cell line, CHO-derived human t-Plasminogen Activator/tPA protein
Met1-Pro562, with a C-terminal 6-His tag
Single-chain proform was expressed, purified, activated with thermolysin to a 2-chain protease and further purified.
Accession #
N-terminal Sequence
Ser36 (Chain A) and Ile311 (Chain B)
Predicted Molecular Mass
31 kDa (Chain A), 29 kDa (Chain B)
30-40 kDa, reducing conditions

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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 MES, 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, 0.01% Tween-20, pH 8.5
  • Recombinant Human t‑Plasminogen Activator/tPA  (rhPLAT) (Catalog # 7449-SE)
  • Fluorogenic Peptide Substrate Z-Gly-Gly-Arg-AMC (Bachem, Catalog # I-1140), 10 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 rhPLAT to 2 ng/µL in Assay Buffer.
  2. Dilute Substrate to 200 µM in Assay Buffer.
  3. Load 50 µL of the 2 ng/µL rhPLAT into a black well plate, and start the reaction by adding 50 µL of 200 µM Substrate. Include a Substrate Blank containing 50 µL Assay Buffer and 50 µL of 200 µM Substrate without any rhPLAT.
  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 (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 Coumarin (AMC) (Sigma, Catalog # A9891).

  • rhPLAT: 0.1 µg
  • Substrate: 100 µM

Scientific Data

Enzyme Activity Recombinant Human t-Plasminogen Activator/tPA Protein Enzyme Activity View Larger

Recombinant Human t-Plasminogen Activator (Catalog # 7449-SE) is measured by its ability to cleave a peptide substrate, N-carbobenzyloxy-Gly-Gly-Arg-7-amido-4-methylcoumarin (Z-GGR-AMC).

Reconstitution Calculator

Reconstitution Calculator

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Background: t-Plasminogen Activator/tPA

PLAT, also known as tissue-type plasminogen activator (tPA), is a secreted serine protease synthesized by endothelial cells (1).  The partially active single chain can be further processed to full activity by plasmin, tissue kallikrein or Factor Xa.  Active PLAT converts plasminogen to plasmin, a fibrinolytic protease, by hydrolyzing an Arg-Val peptide bond in plasminogen.  Unusually high levels of tPA activity can result in excessive bleeding, and low levels of tPA activity can result in thrombosis or embolism.  Human PLAT contains 4 domains; the N-terminal fibronectin type-1 domain, an epidermal growth factor-like domain, two kringle domains and a serine protease catalytic domain.

  1. Lijnen H.R. and D. Collen (2004) Handbook of Proteolytic Enzymes (ed. Barrett, et al.) p. 1684, Academic Press, San Diego.
Long Name
Tissue Plasminogen Activator
Entrez Gene IDs
5327 (Human); 18791 (Mouse); 25692 (Rat)
Alternate Names
Alteplase; DKFZp686I03148; EC 3.4.21; EC; plasminogen activator, tissue type; plasminogen activator, tissue; PLAT; Reteplase; tissue plasminogen activator (t-PA); tissue-type plasminogen activator; TPA; T-PA; tPlasminogen Activator; t-Plasminogen Activator

Citation for Recombinant Human t-Plasminogen Activator/tPA 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.

1 Citation: Showing 1 - 1

  1. Bi-directional epithelial-mesenchymal crosstalk provides self-sustaining pro-fibrotic signals in pulmonary fibrosis
    Authors: L Yao, Y Zhou, J Li, L Wickens, F Conforti, A Rattu, FM Ibrahim, A Alzetani, BG Marshall, SV Fletcher, D Hancock, T Wallis, J Downward, RM Ewing, L Richeldi, P Skipp, DE Davies, MG Jones, Y Wang
    The Journal of Biological Chemistry, 2021;0(0):101096.
    Species: Human
    Sample Types: Whole Cells
    Applications: Bioassay


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Recombinant Human t-Plasminogen Activator/tPA Protein, CF
By Leslie Priddy on 04/01/2018
Application: Cell Adhesion