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Recombinant Human Serpin C1/Antithrombin-III Protein, CF

Bio-Techne includes R&D Systems | Catalog # 1267-PI

Catalog #
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Key Product Details



Accession #




Inhibition Activity

Product Specifications


Mouse myeloma cell line, NS0-derived human Serpin C1/Antithrombin-III protein
His33-Lys464, with a C-terminal 10-His tag


>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.

Endotoxin Level

<1.0 EU per 1 μg of the protein by the LAL method.

N-terminal Sequence Analysis


Predicted Molecular Mass

50 kDa


55-65 kDa, reducing conditions


Measured by its ability to inhibit Recombinant Human Coagulation Factor II/Thrombin (Catalog # 1473-SE) cleavage of a fluorogenic peptide substrate Boc-VPR-AMC (Catalog # ES011).
The IC50 value is <5 nM, as measured under the described conditions.

Formulation, Preparation and Storage

Formulation Lyophilized from a 0.2 μm filtered solution in MES and NaCl.
Reconstitution Reconstitute at 100 μg/mL in sterile 25 mM MES, 150 mM NaCl, pH 6.5.
Shipping The product is shipped at ambient temperature. 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.

Background: Serpin C1/Antithrombin-III

Serpin C1 is a member of the Serpin superfamily of the serine protease inhibitors (1). It is the principal plasma Serpin of blood clotting proteases and inhibits thrombin as well as several factors such as Xa (2). Similar to Serpins A5 and D1, its thrombin inhibitory activity is enhanced by heparin. Hereditary and acquired Serpin C1 deficiency is the cause of an increased thrombotic tendency in many cases (3). For example, acquired Serpin C1 deficiency is a common condition in sepsis, after major trauma or surgery (4).


  1. Silverman, G.A. et al. (2001) J. Biol. Chem. 276:33293.
  2. Chuang, Y.-J. et al. (2001) Biochemistry 40:6670.
  3. Vinazzer, H. (1999) Semin. Thromb. Hemost. 25:257.
  4. Risberg, B. (1998) Blood Coagul. Fibrinolysis Suppl. 3:S3.

Alternate Names

Antithrombin-III, ATIII

Entrez Gene IDs

462 (Human); 11905 (Mouse)

Gene Symbol



Additional Serpin C1/Antithrombin-III Products

Product Documents for Recombinant Human Serpin C1/Antithrombin-III Protein, CF

Certificate of Analysis

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Product Specific Notices for Recombinant Human Serpin C1/Antithrombin-III Protein, CF

For research use only

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