Journal
ACS MEDICINAL CHEMISTRY LETTERS
Volume 12, Issue 3, Pages 365-372Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsmedchemlett.0c00386
Keywords
Furin inhibitors; infectious diseases; structure-activity relationship studies; enzyme kinetics; plasma stability
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Funding
- National Science Centre, Poland [UMO-2012/07/N/ST5/01998]
- Canadian Institutes of Health Research [PJT166037]
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The study aimed to improve the affinity of CF1 by altering its PS position. Results showed that substituting the PS position with small hydrophobic residues or a basic residue can enhance the activity of CF1.
Furin plays an important role in various pathological states, especially in bacterial and viral infections. A detailed understanding of the structural requirements for inhibitors targeting this enzyme is crucial to develop new therapeutic strategies in infectious diseases, including an urgent unmet need for SARS-CoV-2 infection. Previously, we have identified a potent furin inhibitor, peptide Ac-RARRRKKRT-NH2 (CF1), based on the highly pathogenic avian influenza hemagglutinin. The goal of this study was to determine how its N-terminal part (the P8-PS positions) affects its activity profile. To do so, the positional-scanning libraries of individual peptides modified at the selected positions with natural amino acids were generated. Subsequently, the best substitutions were combined together and/or replaced by unnatural residues to expand our investigations. The results reveal that the affinity of CF1 can be improved (2-2.5-fold) by substituting its PS position with the small hydrophobic residues (Ile or Val) or a basic Lys.
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