PAI-1, Human, mAb MA-55F4C12

Catalog #: HM2180
Quantity: 100 µg

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Plasminogen activator inhibitor type-1 (PAI-1), a member of the serine protease inhibitor (serpin) superfamily is an important protein in the regulation of fibrinolysis. PAI-1 is unique among the serpins because of its functional and conformational flexibility. PAI-1 is the most important physiological inhibitor of both tissue-type plasminogen activator (t-PA) and urokinase-type plasminogen activator (u-PA). Increased PAI-1 levels are associated with thrombotic events and is an established risk factor for cardiovascular diseases. The active conformation PAI-1 inhibits its target proteinases by the formation of a stable, inactive complex. Although PAI-1 is synthesized as an active molecule, it converts spontaneously to an inactive, latent form that can be partially reactivated by denaturing agents. In addition, a third conformation reacting as a non-inhibitory substrate towards various target proteinases has been identified. The epitope of monoclonal antibody MA-55F4C12 is within the stretch of 29 amino acids in PAI-1 (region Glu128-Ala131). Glu128, Val129, Glu130, Arg131 and Lys154 are the major determinants. All five residues act cooperatively in the binding to MA-55F4C12 and constitute the epitope. The epitope of the antibody does not cover the complete alpha-helix F and turn connecting alpha-helix F and beta-strand s3A, but is restricted to the hinge region between alpha-helix F and the main part of the PAI-1 molecule. The monoclonal antibody MA-55F4C12 is a 'switching' antibody, capable of inducing a non-inhibitory substrate form of PAI-1. The antibody cross reacts with rat and mouse PAI-1.


Catalog number HM2180
Product type Monoclonal antibodies
Quantity 100 µg
Formulation 1 ml (100 µg/ml) 0.2  µm filtered antibody solution in PBS, containing 0.1% bovine serum albumin.
Isotype Mouse IgG1
Species Human
Cross reactivity Mouse - Yes, Rat - Yes
Storage and stability Product should be stored at 4 °C. Under recommended storage conditions, product is stable for one year.
Precautions For research use only. Not for use in or on humans or animals or for diagnostics. It is the responsibility of the user to comply with all local/state and Federal rules in the use of this product. Hycult Biotech is not responsible for any patent infringements that might result with the use of or derivation of this product.
Disease Cardiology and metabolism, Tumor immunology
  • Application:
    FS, IA
  • Use:
    For inhibition of biological activity dilutions have to be made according to the amounts PAI-1 to be inactivated.
1. Debrock, S et al; Neutralization of plasminogen activator inhibitor-1 inhibitory properties: identification of two different mechanisms. Biochim Biophys Acta 1997, 1337: 257
2. Bijnens, A et al; Importance of the hinge region between alpha-helix F and the main part of serpins, based upon identification of the epitope of plasminogen activator inhibitor type 1 neutralizing antibodies. J Biol Chem 2000, 275: 6375
3. Naessens, D et al; Elucidation of the epitope of a latency-inducing antibody: identification of a new molecular target for PAI-1 inhibition. Thromb Haemost 2003, 90: 52