Overexpression of bromodomain factor 3 in Trypanosoma cruzi (TcBDF3) affects parasite differentiation and protects it against bromodomain inhibitors.

The bromodomain is the only protein domain known to bind acetylated lysine. In the last few years many bromodomain inhibitors have been developed in order to treat diseases such as cancer caused by aberrant acetylation of lysine residues. We have previously characterized Trypanosoma cruzi bromodomain factor 3 (TcBDF3), a bromodomain with an atypical localization that binds acetylated α-tubulin. In the present work we show that parasites overexpressing TcBDF3 exhibit altered differentiation patterns and are less susceptible to treatment with bromodomain inhibitors. We also demonstrate that recombinant TcBDF3 is able to bind to these inhibitors in vitro in a concentration-dependant manner. In parallel, the overexpression of a mutated version of TcBDF3 negatively affects growth of epimastigotes. Recent results, including the ones presented here, suggest that bromodomain inhibitors can be conceived as a new type of anti-parasitic drug against trypanosomiasis.