Abstract
Dipeptidyl peptidase IV is a glycoprotein which removes N-terminal dipeptides from physiologically relevant polypeptides. An homologous series of 6-imino-2-thioxo-5-{[3,4,5-tris(methyloxy)phenyl]methyl}-2,5-dihydro-4(3H)-pyrimidinones has been tested for inhibition of DPP IV activity. The inhibitory effects at 0.1 mM were observed. Enzyme kinetic studies revealed that compounds inhibit DPP IV activity competitively. According to the molecular docking analysis, the inhibitors are anchored into the DPP IV hydrolytic site by interactions of the pyrimidinone core with Glu206, Tyr662, and Tyr547, with the alkyl chain entering the S1 pocket. We conclude that pyrimidinone-like compounds are a promising new scaffold for reversible inhibition of DPP IV.
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Abbreviations
- DPP IV:
-
Dipeptidyl peptidase IV
- GLP-1:
-
Glucagon-like peptide-1
- GIP:
-
Glucose-dependent insulinotropic polypeptide
- SAR:
-
Structure–activity relationship
- RMSD:
-
Root mean square deviation
- PDB:
-
Protein Data Bank
- GOLD:
-
Genetic optimisation for ligand docking
- MTS:
-
3-(4,5-Dimethylthiazole-2-yl)-5-(3-carboximethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazole
- ECACC:
-
European Collection of Cell Cultures
- THP-1:
-
Human monocytic leukemia
- HepG2:
-
Human Caucasian hepatocyte carcinoma
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Acknowledgments
Special thanks to Professor Michael J. Parnham for his help in editing and critical reviewing of this manuscript, as well as to Dr. Andrew Leach for useful remarks. The authors are grateful to Snježana Dragojević for analytical characterization of the tested compounds. We also appreciate the excellent technical assistance provided by Ana Cvetković, Klara Markušić and Željka Tolić.
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Dubravko Jelić and Donatella Verbanac equally contributed to this work.
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Jelić, D., Nujić, K., Stepanić, V. et al. 6-Imino-2-thioxo-pyrimidinones as a new class of dipeptidyl peptidase IV inhibitors. Med Chem Res 20, 339–345 (2011). https://doi.org/10.1007/s00044-010-9314-5
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DOI: https://doi.org/10.1007/s00044-010-9314-5