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Engineering of a macromolecular scaffold to develop specific protease inhibitors
A Allart Stoop1, Charles S Craik
1Department of Pharmaceutical Chemistry, University of California San Francisco, 600 16th Street Suite S512, San Francisco, California 94143-2280, USA.
Nature Biotechnology
|August 19, 2003
Summary
Engineered ecotin protein libraries targeting serine proteases achieved high specificity. A potent plasma kallikrein (Pkal) inhibitor was developed with picomolar affinity, demonstrating the scaffold
Area of Science:
- Biochemistry and Molecular Biology
- Protein Engineering
- Enzyme Inhibition
Background:
- Serine proteases are critical regulators in physiological processes, making their specific inhibition valuable for research and therapeutics.
- Ecotin, a known serine protease inhibitor, offers a promising scaffold for developing highly specific inhibitors due to its extensive inhibitor-protease interface.
Purpose of the Study:
- To engineer novel ecotin-based libraries with mutations across the entire binding interface to discover potent and specific serine protease inhibitors.
- To validate the efficacy of these engineered libraries against target serine proteases, including plasma kallikrein (Pkal).
Main Methods:
- Creation of diverse ecotin libraries using synthetic shuffling and restricted tetranomial diversity, mutating all 20 amino acid residues in the binding interface.
- Application of competitive phage display selection to identify high-affinity inhibitors against specific serine proteases.
- Characterization of inhibitor efficacy using dissociation equilibrium constants (K(i)*) and selectivity profiling against related proteases.
Main Results:
- A highly potent Pkal inhibitor was isolated with an apparent K(i)* of 11 pM.
- This Pkal inhibitor exhibited remarkable selectivity, with K(i)* values for related proteases (FXa, FXIa, uPA, thrombin, MT-SP1) being four to seven orders of magnitude higher.
- The ecotin scaffold's adaptability was confirmed by isolating inhibitors for two additional serine proteases: MT-SP1/matriptase and Factor XIIa.
Conclusions:
- Engineered ecotin libraries are effective for developing highly specific and potent serine protease inhibitors.
- The ecotin scaffold is versatile and can be adapted to target a range of therapeutically relevant serine proteases.
- This approach holds significant potential for advancing basic research and developing novel therapeutic strategies targeting serine protease dysregulation.