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Binding to large enzyme pockets: small-molecule inhibitors of trypanothione reductase.

ChemMedChem (2014-05-03)
Elke Persch, Steve Bryson, Nickolay K Todoroff, Christian Eberle, Jonas Thelemann, Natalie Dirdjaja, Marcel Kaiser, Maria Weber, Hassan Derbani, Reto Brun, Gisbert Schneider, Emil F Pai, R Luise Krauth-Siegel, François Diederich
ABSTRACT

The causative agents of the parasitic disease human African trypanosomiasis belong to the family of trypanosomatids. These parasitic protozoa exhibit a unique thiol redox metabolism that is based on the flavoenzyme trypanothione reductase (TR). TR was identified as a potential drug target and features a large active site that allows a multitude of possible ligand orientations, which renders rational structure-based inhibitor design highly challenging. Herein we describe the synthesis, binding properties, and kinetic analysis of a new series of small-molecule inhibitors of TR. The conjunction of biological activities, mutation studies, and virtual ligand docking simulations led to the prediction of a binding mode that was confirmed by crystal structure analysis. The crystal structures revealed that the ligands bind to the hydrophobic wall of the so-called "mepacrine binding site". The binding conformation and potency of the inhibitors varied for TR from Trypanosoma brucei and T. cruzi.

MATERIALS
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Product Description

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