title: Molecular cloning and characterization of a gene encoding the 29-kDa proteasome subunit from Trypanosoma cruzi.
abstract: Antiserum raised against purified Trypanosoma cruzi proteasomes was used to isolate two cDNA clones, tcpr29 and tcpr29B, and the corresponding genomic sequence, termed tcpr29A. Both cDNAs and the gene contain a 798-bp ORF, coding for a 266-amino acid protein, with a predicted molecular mass of 29 kDa. Sequence comparisons show that the protein encoded by tcpr29 belongs to the alpha6 subfamily of proteasome subunits. Southern analysis indicated that tcpr29 subunit is encoded by a single-copy gene which maps to chromosome 20 of the CL Brener clone. Allelic variants were found in other T. cruzi isolates, suggesting heterozygosity for the gene in some and homozygosity in other strains. A spliced-leader addition site was identified 123 bp upstream from the start codon, generating a stable 1.5-kb transcript. Western analysis revealed that tcpr29A is constitutively expressed during the life cycle of the parasite.
authors.affiliation: Departamento de Bioquimica e Imunologia, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
authors.forename: D C
authors.initials: DC
authors.lastname: Bartholomeu
authors.forename: J A
authors.initials: JA
authors.lastname: Batista
authors.forename: M H
authors.initials: MH
authors.lastname: Vainstein
authors.forename: B D
authors.initials: BD
authors.lastname: Lima
authors.forename: M C
authors.initials: MC
authors.lastname: de Sá
mesh_terms: D020121:5' Untranslated Regions / Q000235:genetics; D000251:Adenosine Triphosphatases / Q000235:genetics; D000595:Amino Acid Sequence; D000818:Animals; D017360:Arabidopsis / Q000235:genetics; D001483:Base Sequence; D003001:Cloning, Molecular; D003546:Cysteine Endopeptidases / Q000737:chemistry / Q000235:genetics*; D018076:DNA, Complementary; D004023:Dictyostelium / Q000235:genetics; D004331:Drosophila melanogaster / Q000235:genetics; D017125:Genes, Protozoan; D006801:Humans; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009097:Multienzyme Complexes / Q000737:chemistry / Q000235:genetics*; D016366:Open Reading Frames; D046988:Proteasome Endopeptidase Complex; D021122:Protein Subunits; D051381:Rats; D011994:Recombinant Proteins / Q000737:chemistry; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D012689:Sequence Homology, Nucleic Acid; D014349:Trypanosoma cruzi / Q000201:enzymology / Q000235:genetics*
chemical_list: D020121:5' Untranslated Regions; D018076:DNA, Complementary; D009097:Multienzyme Complexes; D021122:Protein Subunits; D011994:Recombinant Proteins; D003546:Cysteine Endopeptidases; D046988:Proteasome Endopeptidase Complex; D000251:Adenosine Triphosphatases