Biological Evaluation and X-ray Co-crystal Structures of Cyclohexylpyrrolidine Ligands for Trypanothione Reductase, an Enzyme from the Redox Metabolism of Trypanosoma.

Abstract:

:The tropical diseases human African trypanosomiasis, Chagas disease, and the various forms of leishmaniasis are caused by parasites of the family of trypanosomatids. These protozoa possess a unique redox metabolism based on trypanothione and trypanothione reductase (TR), making TR a promising drug target. We report the optimization of properties and potency of cyclohexylpyrrolidine inhibitors of TR by structure-based design. The best inhibitors were freely soluble and showed competitive inhibition constants (Ki ) against Trypanosoma (T.) brucei TR and T. cruzi TR and in vitro activities (half-maximal inhibitory concentration, IC50 ) against these parasites in the low micromolar range, with high selectivity against human glutathione reductase. X-ray co-crystal structures confirmed the binding of the ligands to the hydrophobic wall of the "mepacrine binding site" with the new, solubility-providing vectors oriented toward the surface of the large active site.

journal_name

ChemMedChem

journal_title

ChemMedChem

authors

De Gasparo R,Brodbeck-Persch E,Bryson S,Hentzen NB,Kaiser M,Pai EF,Krauth-Siegel RL,Diederich F

doi

10.1002/cmdc.201800067

subject

Has Abstract

pub_date

2018-05-08 00:00:00

pages

957-967

issue

9

eissn

1860-7179

issn

1860-7187

journal_volume

13

pub_type

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