Recombinant Human Activated Coagulation Factor Xa, ACFP

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R&D Systems Animal Component Free Recombinant Proteins
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Recombinant Human Activated Coagulation Factor Xa, ACFP Summary

Product Specifications

>95%, by SDS-PAGE under reducing conditions and visualized by silver stain.
Endotoxin Level
<1.0 EU per 1 μg of the protein by the LAL method.
Measured by its ability to cleave the fluorogenic peptide substrate, Mca-RPKPVE-Nval-WRK(Dnp)-NH2 (Catalog # ES002). The specific activity is >800 pmol/min/μg, as measured under the described conditions.
Spodoptera frugiperda, Sf 9 (baculovirus)-derived human Coagulation Factor X protein
Met1-Lys488, with a C-terminal 10-His tag
Proform Factor X was expressed, purified, activated and further purified to yield Factor Xa. Produced in an animal component free process (ACFP).
Accession #
N-terminal Sequence
Phe80, Tyr84, & Ile235
Structure / Form
Active Form. Recombinant Human Coagulation Factor Xa Animal Component Free is prone to proteolytic cleavage at C-terminus. The predominant form of the purified protein lacks the His tag.
Predicted Molecular Mass
16.6 kDa & 30 kDa
12-15 kDa and 30-36 kDa, reducing conditions

Product Datasheets

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ACFP1063 (carrier free)

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 Lyophilized from a 0.2 μm filtered solution in MES, NaCl and CaCl2.
Reconstitution Reconstitute at 100 μg/mL in sterile 25 mM MES, 150 mM NaCl and 5 mM CaCl2, pH 6.0
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 reconstitution.

Assay Procedure

  • Assay Buffer: 50 mM Tris, 10 mM CaCl2, 150 mM NaCl, 0.05% Brij-35, pH 7.5 (TCNB)
  • Recombinant Human Coagulation Factor Xa Animal Component Free (rhFactor Xa) (Catalog # ACFP1063)
  • Substrate: Fluorogenic Peptide Substrate II, Mca-Arg-Pro-Lys-Pro-Val-Glu-Nval-Trp-Arg-Lys(Dnp)-NH2 (Catalog # ES002)
  • F16 Black Maxisorp Plate (Nunc, Catalog # 475515)
  • Fluorescent Plate Reader (Model: SpectraMax Gemini EM by Molecular Devices) or equivalent
  1. Dilute rhFactor Xa to 0.4 ng/μL in Assay Buffer.
  2. Dilute Substrate to 20 μM in Assay Buffer.
  3. Load 50 μL of the 0.4 ng/μL rhFactor Xa into plate and start the reaction by adding 50 μL of 20 μM Substrate. Include a Substrate Blank containing 50 μL Assay Buffer and 50 μL of 20 μM Substrate without any rhFactor Xa.
  4. Read at excitation and emission wavelengths of 320 nm and 405 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 MCA-Pro-Leu-OH (Bachem, Catalog # M-1975).

  • rhFactor Xa: 0.02 μg
  • Substrate: 10 μM
Reconstitution Calculator

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Background: Coagulation Factor X

As the only known physiological activator of thrombin, Factor X is a vitamin K-dependent plasma protease that plays a pivotal role in blood coagulation. Human Factor X is initially synthesized in the liver as a single-chain precursor of 488 amino acid residues with a signal peptide and a pro region (residues 1‑40). Both the intrinsic and extrinsic pathways activate Factor X to Xa, which consists of light (residues 41‑179) and heavy (residues 235‑488) chains linked by a disulfide bond. The light chain contains a Gla and two EGF‑like domains and the heavy chain corresponds to the serine protease domain. The full-length human Factor X was expressed and the pro enzyme was purified and activated. The active protease (rhFactor Xa) was further purified and analyzed for its activity towards either peptides or proteins containing a Xa cleavage site. In addition to the activity described in the Activity Assay Protocol, rhFactor Xa also can be used to cleave fusion proteins containing a Factor Xa cleavage site. The conditions for the optimal cleavage of a particular fusion protein, such as the molar ratio between rhFXa and the protein and time and temperature of incubation, are protein-dependent and need to be individually determined.

Entrez Gene IDs
2159 (Human); 14058 (Mouse); 29243 (Rat)
Alternate Names
Cf10; Coagulation Factor X; EC 3.4.21; EC; F10; factor Xa; FX; FXa; Prothrombinase; Stuart Factor; Stuart-Prower factor

Manufacturing Specifications

Animal Component-Free Process (ACFP) Manufacturing Conditions
R&D Systems Animal Component-Free Process (ACFP) recombinant proteins are expressed in an animal-free certified Sf 9 insect cell line using dedicated animal-free raw materials and labware. Production and purification procedures use equipment and media that are confirmed animal-free but performed outside our dedicated animal-free laboratories. Every stage of the manufacturing process follows R&D Systems' stringent Standard Operating Procedures (SOPs). The certified Sf 9 insect cell bank has undergone extensive testing to certify the lack of cytopathogens by screening for various viruses, Mycoplasma, and Spiroplasmas using both in vitro and in vivo testing methods. For ex vivo research or bioproduction, additional documentation can be provided.

Please read our complete ACFP Statement


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Fluorogenic Peptide Substrates

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