Characterization of 2,4-Diamino-6-Oxo-1,6-Dihydropyrimidin-5-Yl Ureido Based Inhibitors of Trypanosoma Brucei Fold and Testing for Antiparasitic Activity.
Eadsforth, T.C., Pinto, A., Luciani, R., Tamborini, L., Cullia, G., De Micheli, C., Marinelli, L., Cosconati, S., Novellino, E., Lo Presti, L., Cordeiro Da Silva, A., Conti, P., Hunter, W.N., Costi, M.P.(2015) J Med Chem 58: 7938
- PubMed: 26322631 
- DOI: https://doi.org/10.1021/acs.jmedchem.5b00687
- Primary Citation of Related Structures:  
4CJX - PubMed Abstract: 
The bifunctional enzyme N(5),N(10)-methylenetetrahydrofolate dehydrogenase/cyclo hydrolase (FolD) is essential for growth in Trypanosomatidae. We sought to develop inhibitors of Trypanosoma brucei FolD (TbFolD) as potential antiparasitic agents. Compound 2 was synthesized, and the molecular structure was unequivocally assigned through X-ray crystallography of the intermediate compound 3. Compound 2 showed an IC50 of 2.2 μM, against TbFolD and displayed antiparasitic activity against T. brucei (IC50 49 μM). Using compound 2, we were able to obtain the first X-ray structure of TbFolD in the presence of NADP(+) and the inhibitor, which then guided the rational design of a new series of potent TbFolD inhibitors.
Organizational Affiliation: 
Division of Biological Chemistry and Drug Discovery, College of Life Sciences, University of Dundee , Dow Street, Dundee DD1 5EH, U.K.