Add time:08/10/2019 Source:sciencedirect.com
A series of fluorobenzoylated di- and tripeptides as potential leads for the development of molecular probes for imaging of COX-2 expression was prepared according to standard Fmoc-based solid-phase peptide synthesis. All peptides were assessed for their COX-2 inhibitory potency and selectivity profile in a fluorescence-based COX binding assay. Within the series of 15 peptides tested, cysteine-containing peptides numbered 7, 8, 11 and 12, respectively, were the most potent COX-2 inhibitors possessing IC50 values ranging from 5 to 85 μM. Fluorobenzoylated tripeptides 7 and 8 displayed some COX-2 selectivity (COX-2 selectivity index 2.1 and 1.6), whereas fluorobenzoylated dipeptides 11 and 12 were shown not to be COX-2 selective. Fluorbenzoylated tripeptide FB-Phe-Cys-Ser-OH was further used in molecular modeling docking studies to determine the binding mode within the active site of the COX-2 enzyme.
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