cruzi (herein named TcCox10 and TcCox15). Furthermore, we show that the genes encoding TcCox10 and TcCox15 are differentially transcribed during the parasite life cycle. Escherichia

coli strains used for all cloning procedures were grown at 37 °C in Luria–Bertani medium supplemented with ampicillin (100 μg mL−1) as necessary. The wild-type (WT) Ganetespib Saccharomyces cerevisiae yeast strain used in this study was DY5113 (W303) MATa ade2-1 his3-1, 15 leu2-3, 112 trp1_, ura3-1, a generous gift from Dennis Winge (University of Utah). Strains with the ORF deletions Δcox10 and Δcox15 were generated for this work from DY5113 strains by homologous recombination with KanMX4 disruption cassettes (Wach et al., 1994): Δcox10∷KanMX4 and Δcox15∷KanMX4, respectively. These deletions were confirmed by PCR. Yeast strains were transformed using lithium acetate (Gietz & Woods, 2002). The cells were grown either in a rich medium (YP, 1% yeast extract, 2% peptone) or in a synthetic complete (SC) medium lacking the appropriate nutrients for plasmid selection. Glucose 2% (Glc), galactose 2% (Gal) and/or glycerol 3%–ethanol

2% (Gly–EtOH) were used as carbon sources. The respiratory competence of the strains was determined using growth tests on plates containing 2% glucose Metformin or 2% glycerol–3% ethanol as carbon sources, which were incubated at 30 °C for 3–5 days. The Chinese hamster ovary cell line CHO-K1 was routinely cultivated in RPMI medium supplemented with 10% heat-inactivated NADPH-cytochrome-c2 reductase fetal calf serum (FCS) and 0.15% (w/v) NaHCO3 at 37 °C in a humid atmosphere containing 5% CO2. Epimastigotes of T. cruzi, the CL strain, clone 14, were maintained in the mid-log phase by passages through liver infusion-tryptose medium supplemented with 10% FCS at 28 °C (Camargo, 1964). Intracellular forms (amastigotes) and trypomastigotes were obtained as described previously (Almeida-de-Faria et al., 1999; Silber et al., 2009). Metacyclic trypomastigotes were obtained via in vitro differentiation of epimastigote

cells in the stationary phase (de Sousa, 1983) and then transferred to Grace’s insect cell culture medium (pH 6.0 without FCS addition) (Gibco, Invitrogen). The purity of all the forms obtained as well as their viability were evaluated by microscopic observation. The T. cruzi cds of HOS (Tc00.1047053509601.59/Tc00.1047053509767.59, hereafter named TcCOX10A and TcCOX10B, respectively) and HAS (Tc00.1047053511211.70, hereafter named TcCOX15) were amplified by PCR using genomic DNA obtained from epimastigotes of the CL Brener strain. The primers listed below were designed to introduce the restriction sites BamHI or XbaI at the 5′-end and XhoI-3′ and a 3′-6xHis epitope tag. FP.TcCOX15.XbaI: 5′-GCTCTAGAATGTTGCGATTCAGGCCGC-3′; FP.TcCOX15.BamHI: 5′-GCGGATCCATGTTGCGATTCAGGCCGC-3′; RP-TcCOX15-XhoI: 5′-CCGCTCGAGTTAATGGTGATGGTGATGATGACCGATAACGGTCCAAATACCAAG-3′; FP-TcCOX10-XbaI: 5′-GCTCTAGAATGATCCGACGAGCCCTTC-3′; FP.TcCOX10.