The remaining digestion product was adjusted to a final concentration of 3 mM of CaCl2 and diluted with 3 volumes of calmodulin binding buffer (10 mM Tris-HCl, pH 8.0, 150 mM NaCl and 2 mM of CaCl2). The mix was incubated for 2 h at 4°C with 30 μl of a Calmodulin Sepharose™ 4B bead suspension (GE Healthcare). Following incubation, the flow through was saved and calmodulin beads were washed three times with 1 ml of calmodulin binding buffer. Proteins were eluted with calmodulin elution buffer (10 mM Tris-HCl, pH 8.0, 150 mM NaCl and 2 mM of EGTA) and the remaining beads were boiled with SDS-PAGE sample buffer. All fractions were TCA concentrated before

analysis. Acknowledgements We would like to thank Dr. Lauro Manhães de Souza for contribution to the FACS analysis, Dra. Daniela Gradia Fiori for kindly providing

the antibody against L26 and α2 proteins, Dra. Barasertib Daniela Parada Pavoni and Andreia Cristine Dallabona for help with real-time RT-PCR analysis and Dr. Alexandre Dias Tavares Costa for revising the manuscript. We also would like to thank The National Center for Research Resources (Yeast Resource Center) for providing the plasmids containing CFP and YFP tags. SPF, MAK and SG are research fellows from Conselho Nacional de Desenvolvimento Científico e Tecnologico (CNPq). Electronic supplementary material Additional file 1: Figure S1 – Detection of polyhistidine and c-myc -fused recombinant SAHA HDAC ic50 centrin. Lanes represent protein extracts from T. cruzi wild type cells (WT), T. cruzi cells transfected with MYCneo-centrin and 6Hneo-centrin. These extracts were incubated with antibodies against (A) c-myc and (B) histidine. BenchMark (Invitrogen) was used as the molecular weight marker. (TIFF 478 KB) Additional file 2: Table S1 – Molecular weight of native and recombinant proteins. (XLS 7 KB) Additional file 3: Figure S2 – Subcellular

localization of centrin using c-myc epitope tag. Fluorescence microscopy of epimastigotes transfected with MYCneo-centrin. The merged frame was composed by “”Anti-c-myc”" and “”DAPI”" images overlap. (TIFF 275 KB) Additional file 4: Figure S3 – Tandem affinity purification efficiency. Fractions of a complete L27 TAP purification were probed with anti-CBP antibody to follow the fusion protein and characterize the tags efficiency. 1 – wild Carbachol type cells extract; 2 – transfected cells extract; 3 and 6 – flow through from IgG and Calmodulin columns, respectively; 4 and 7 – first and second washes from IgG and Calmodulin columns, respectively; 5 and 8 – third wash from IgG and Calmodulin columns, respectively; 9 – calmodulin beads; 10 – EGTA eluted. Fifteen micrograms of protein were loaded in lanes 1, 2 and 3; remaining fractions were TCA concentrated and 100% loaded. BenchMark (Invitrogen) was used as the molecular weight marker. (TIFF 542 KB) Additional file 5: Table S2 – Oligonucleotides for plasmid construction.