Structural highlights
FunctionPPCE_HUMAN Cleaves peptide bonds on the C-terminal side of prolyl residues within peptides that are up to approximately 30 amino acids long. Publication Abstract from PubMedProlyl endopeptidase (PREP) is a dynamic serine protease that cleaves proline-containing peptides. PREP is also involved in numerous pathophysiological processes through modulation of protein-protein interactions and has been extensively studied in neurodegenerative diseases. In this study, we report the structure-based design and synthesis of covalent PREP inhibitors built on a 4-chloro-pyrazolopyridine (CPzP) scaffold, previously identified through chemoproteomic screening to target a noncatalytic cysteine residue within the active site. Guided by crystallographic data and molecular docking studies, we optimized initial hits to develop a potent inhibitor exhibiting nanomolar potency in both biochemical and cellular assays, with high selectivity over related serine proteases FAP and DPP4. Molecular dynamics simulations indicated that modulation of the conformational flexibility of a dynamic A-loop within PREP by CPzP analogs may contribute to inhibitory potency. Collectively, this work introduces a new class of structurally distinct inhibitors and provides tools to explore the diverse biological roles of PREP. Structure-Guided Optimization of 4-Chloro-Pyrazolopyridine Analogs for Covalent PREP Inhibition.,Thakur K, Fucci I, Pandian J, Suazo KF, Monteiro DCF, Yoo E J Med Chem. 2026 Jan 22;69(2):1303-1321. doi: 10.1021/acs.jmedchem.5c02680. Epub , 2026 Jan 9. PMID:41512187[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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This page was last modified 13:30, 10 February 2026.