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CAPRRESI: Chimera Assembly by Plasmid Recovery and Restriction Enzyme Site Insertion
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A prourokinase-RGDS chimera : Construction, expression and characterization.

B Qian1, Y Sun, Y Guo

  • 1National Laboratory of Protein Engineering, Department of Biochemistry and Molecular Biology, Life Science Centre, Peking University, 100871, Beijing, China.

Science in China. Series C, Life Sciences
|March 16, 2010
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Summary

A novel chimera incorporating the RGDS tetrapeptide into pro-urokinase (proUK) demonstrates effective calcium-dependent platelet binding and potent thrombolytic activity. This engineered protein shows comparable amidolytic and plasminogen activation to native urokinase, suggesting its potential as a bifunctional therapeutic agent.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biotechnology

Background:

  • Urokinase (UK) is a serine protease involved in fibrinolysis.
  • Developing effective thrombolytic agents with improved targeting and dual functionality is crucial for treating thrombotic diseases.
  • The RGDS tetrapeptide sequence is known to interact with integrins on platelet surfaces.

Purpose of the Study:

  • To engineer a recombinant pro-urokinase (proUK) chimera containing the RGDS tetrapeptide within its kringle domain.
  • To characterize the biochemical and functional properties of the proUK-RGDS chimera.
  • To evaluate the potential of the chimera as a bifunctional thrombolytic agent.

Main Methods:

  • Construction and expression of a mutant proUK-RGDS gene using the baculovirus system.
  • Purification of the chimera via immunoaffinity chromatography.
  • Assessment of calcium-dependent platelet membrane binding.
  • Enzyme activity assays including amidolytic activity and plasminogen activation kinetics (Michaelis-Menten).
  • In vitro platelet aggregation inhibition assays.

Main Results:

  • The proUK-RGDS chimera was purified to >90% purity.
  • The chimera exhibited calcium-dependent binding to platelet membranes.
  • Specific amidolytic activity of plasmin-activated chimera (62,000 IU/mg) was comparable to native proUK.
  • Plasminogen activation by the chimera followed Michaelis-Menten kinetics with a Km of 0.97 µmol/L, similar to native urokinase.
  • The chimera demonstrated significant inhibition of platelet aggregation in vitro.

Conclusions:

  • The engineered proUK-RGDS chimera retains key functional properties of native urokinase, including enzymatic activity and plasminogen activation.
  • The chimera's ability to bind to platelets and inhibit aggregation suggests enhanced targeting and a dual mechanism of action.
  • This bifunctional chimera holds promise as a novel therapeutic agent for thrombolysis.