Thromb Haemost 2008; 100(03): 413-419
DOI: 10.1160/TH08-04-0225
Blood Coagulation, Fibrinolysis and Cellular Haemostasis
Schattauer GmbH

Simplified recombinant plasmin: Production and functional comparison of a novel thrombolytic molecule with plasma-derived plasmin

Jennifer A. Hunt
1   Talecris Biotherapeutics, Research Triangle Park, North Carolina, USA
,
Stephen R. Petteway Jr
1   Talecris Biotherapeutics, Research Triangle Park, North Carolina, USA
,
Philip Scuderi
1   Talecris Biotherapeutics, Research Triangle Park, North Carolina, USA
,
Valery Novokhatny
1   Talecris Biotherapeutics, Research Triangle Park, North Carolina, USA
› Author Affiliations
Financial support: This research was supported by Talecris Biotherapeutics.
Further Information

Publication History

Received 09 April 2008

Accepted after minor revision 07 July 2008

Publication Date:
22 November 2017 (online)

Summary

A simplified and fully functional deletion mutant of plasminogen was created in which the middle portion of the molecule was removed, resulting in kringle 1 attachment to the serine protease domain. This recombinant plasminogen deletion mutant, Δ(K2-K5)Pg, was produced in the form of inclusion bodies at the yield of up to 200 mg/l in an Escherichia coliT7 expression system. Following protein refolding and purification on lysine-Sepharose, the conversion of the recombinant molecule Δ(K2-K5)Pg to the active enzyme mutant Δ(K2-K5)Pm by plasminogen activators was evaluated, and functional characteristics of the simplified plasmin were studied. Properties of Δ(K2-K5)Pg were similar to native, human plasma-derived plasminogen. Δ(K2-K5)Pg effectively bound ε-aminocaproic acid (Kd = 1 1.3 ± 2.3 μ. M) and fibrin (C50 ≈ 0.3 μM).The plasminogen activators streptokinase, urokinase, and tissue plasminogen activator effectively converted the recombinant zymogen Δ(K2-K5)Pg to the active recombinant enzyme, Δ(K2-K5)Pm. Additionally, Δ[K2-K5]Pm was rapidly inhibited by α2-antiplas-min(1.1±0.1x107M−1s−1)andα2-macroglobulin(7.6±0.6x105 M1s−1). In an in-vitro model, Δ(K2-K5)Pm demonstrated fibrinolytic potency comparable to human plasma-derived plasmin. Because of their unique biochemistry, including fibrin-binding properties and rapid inhibition by α2-antiplasmin, both native plasmin and a simplified deletion mutant of plasmin are potentially safe and effective direct thrombolytic agents for various thrombotic conditions. Further studies evaluating the in-vivo pharmacologic safety and clinical efficacy of this simplified plasmin (i.e. Δ[K2-K5]Pm) are warranted.

 
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