title: On the occurrence of thioredoxin in Trypanosoma cruzi.
abstract: The full coding sequence for thioredoxin from Trypanosoma cruzi (TcTRX) strain Tulahuen O has been cloned into the pRSETA vector. The protein was expressed in Escherichia coli with an N-terminal extension of six histidine residues for purification through metal ion chromatography. The biological activity of recombinant TcTRX was proved utilizing the insulin reduction assay. Amino acid sequence alignment indicates a high identity of TcTRX with thioredoxins from different sources. Immunocytochemistry assays showed that TcTRX is present in epimastigote forms of T. cruzi, thus, indicating that the gene is expressed in vivo, rather than being a pseudogene. The in vivo occurrence of TcTRX points out the necessity of considering this protein as a molecular component of the redox metabolism in trypanosomatids.
authors.affiliation: Laboratorio de Bioquímica Microbiana, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, Paraje El Pozo, CC 242, S 3000ZAA Santa Fe, Argentina.
authors.forename: Claudia V
authors.initials: CV
authors.lastname: Piattoni
authors.forename: Víctor S
authors.initials: VS
authors.lastname: Blancato
authors.forename: Hilario
authors.initials: H
authors.lastname: Miglietta
authors.forename: Alberto A
authors.initials: AA
authors.lastname: Iglesias
authors.forename: Sergio A
authors.initials: SA
authors.lastname: Guerrero
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D015153:Blotting, Western; D002846:Chromatography, Affinity; D003001:Cloning, Molecular; D016054:DNA, Protozoan / Q000737:chemistry / Q000235:genetics; D007150:Immunohistochemistry; D008969:Molecular Sequence Data; D010084:Oxidation-Reduction; D016133:Polymerase Chain Reaction; D011994:Recombinant Proteins; D016415:Sequence Alignment; D013879:Thioredoxins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D014349:Trypanosoma cruzi / Q000235:genetics / Q000378:metabolism*
chemical_list: D016054:DNA, Protozoan; D011994:Recombinant Proteins; D013879:Thioredoxins