Improving the selectivity of engineered protease inhibitors: Optimizing the P2 prime residue using a versatile cyclic peptide library

de Veer, Simon J., Wang, Conan K., Harris, Jonathan, Craik, David J., & Swedberg, Joakim E. (2015) Improving the selectivity of engineered protease inhibitors: Optimizing the P2 prime residue using a versatile cyclic peptide library. Journal of Medicinal Chemistry, 58(20), pp. 8257-8268.

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Standard mechanism inhibitors are attractive design templates for engineering reversible serine protease inhibitors. When optimizing interactions between the inhibitor and target protease, many studies focus on the nonprimed segment of the inhibitor's binding loop (encompassing the contact β-strand). However, there are currently few methods for screening residues on the primed segment. Here, we designed a synthetic inhibitor library (based on sunflower trypsin inhibitor-1) for characterizing the P2′ specificity of various serine proteases. Screening the library against 13 different proteases revealed unique P2′ preferences for trypsin, chymotrypsin, matriptase, plasmin, thrombin, four kallikrein-related peptidases, and several clotting factors. Using this information to modify existing engineered inhibitors yielded new variants that showed considerably improved selectivity, reaching up to 7000-fold selectivity over certain off-target proteases. Our study demonstrates the importance of the P2′ residue in standard mechanism inhibition and unveils a new approach for screening P2′ substitutions that will benefit future inhibitor engineering studies.

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7 citations in Web of Science®

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ID Code: 94815
Item Type: Journal Article
Refereed: Yes
Keywords: Protease, Protease inhibitor, Kallikrein
DOI: 10.1021/acs.jmedchem.5b01148
ISSN: 0022-2623
Subjects: Australian and New Zealand Standard Research Classification > BIOLOGICAL SCIENCES (060000) > BIOCHEMISTRY AND CELL BIOLOGY (060100)
Divisions: Current > Schools > School of Biomedical Sciences
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2015 American Chemical Society
Copyright Statement: This document is the Accepted Manuscript version of a Published Work that appeared in final form in
Journal of Medicinal Chemistry, copyright © American Chemical Society after peer review and technical editing by the publisher.
To access the final edited and published work see
Deposited On: 14 Apr 2016 02:50
Last Modified: 30 Oct 2016 13:30

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