title: Identification of a ribosomal ATPase in Escherichia coli cells.
abstract: Eukaryotic ribosomes harbor an ATPase activity that has been shown to be essential for translation elongation in some lower fungi. Here we report the first identification of a ribosome bound ATPase, RbbA, in E. coli cells. RbbA accounts for most of the ATPase activity associated with 70S ribosomes and 30S ribosomal subunits. Both native and recombinant RbbA were purified and shown to possess ribosome-dependent ATPase activities and to stimulate polyphenylalanine synthesis in vitro. Biochemically, RbbA is similar to the fungi-specific translation elongation factor 3 (EF-3) and cross-reacts with antibody raised against EF-3. The gene encoding RbbA is identified as ORF yhih and the predicted RbbA amino acid sequence is 40% similar to that of the C-terminal half of EF-3. The discovery of a ribosomal ATPase in a prokaryotic cell suggests a common, conserved function for these proteins in translation.
authors.affiliation: Banting and Best Department of Medical Research, University of Toronto, Ontario, Canad.
authors.forename: M C
authors.initials: MC
authors.lastname: Kiel
authors.forename: H
authors.initials: H
authors.lastname: Aoki
authors.forename: M C
authors.initials: MC
authors.lastname: Ganoza
mesh_terms: D000251:Adenosine Triphosphatases / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification*; D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000096:biosynthesis; D001483:Base Sequence; D017931:DNA Primers / Q000235:genetics; D004926:Escherichia coli / Q000201:enzymology* / Q000235:genetics / Q000378:metabolism; D005798:Genes, Bacterial; D007120:Immunochemistry; D008969:Molecular Sequence Data; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification; D012269:Ribosomal Proteins / Q000096:biosynthesis; D012270:Ribosomes / Q000201:enzymology*; D017386:Sequence Homology, Amino Acid
chemical_list: D001426:Bacterial Proteins; D017931:DNA Primers; D011994:Recombinant Proteins; D012269:Ribosomal Proteins; D000251:Adenosine Triphosphatases