Abstract Trypanothione (T(SH)2), the major redox mediator in pathogenic trypanosomatids, is synthetized stepwise by two distinct enzymes in Crithidia fasciculata, while in Trypanosoma cruzi a single enzyme catalyzes both steps. A fulllength reading frame presumed to encode trypanothione synthetase (TryS) was obtained by PCR using DNA of T. brucei as template and primers based on fragments of putative TryS genes. The recombinant protein produced by E. coli Origami (DE3) was purified to homogeneity by chelate and ion exchange chromatography. The enzyme catalyzed both reactions of T(SH)2 biosynthesis. Thus, T(SH)2 synthesis appears to be similar in African (T. brucei) and New World (T. cruzi) trypanosomes but distinct from that of Crithidia.
Biological Chemistry – de Gruyter
Published: Apr 10, 2003
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