title: Conformational changes of L-rRNA during elongation of polypeptide.
abstract: A ribosome undergoes significant conformational changes during elongation of a polypeptide chain, and these are correlated with structural changes of rRNAs. We tested 15 different oligonucleotides complementary to the selected, highly conserved seqences of rRNAs (L-rRNA, 5S rRNA and tRNA) important in protein biosynthesis. We carried out a reaction of binding Phe-tRNA to A site and a polymerization of polypeptide chains on the ribosomes converted either to pre- or to posttranslocational states. The inhibition of polymerization reaction by complementary oligonucleotides was high in all ribosomal states. The efficiency of inhibition of binding reaction was lower and more diverse than was the polypeptide elongation. We conclude that the selected oligonucleotides inhibit polypeptide synthesis with different effectivity, primarily depending on L-rRNA conformation within ribosome architecture.
authors.affiliation: Institute of Bioorganic Chemistry, Polish Academy of Sciences, Noskowskiego 12/14, 61-704 Poznań, Poland.
authors.forename: Beata
authors.initials: B
authors.lastname: Dudzińska-Bajorek
authors.forename: Kamilla
authors.initials: K
authors.lastname: Bakowska
authors.forename: Tomasz
authors.initials: T
authors.lastname: Twardowski
mesh_terms: D008958:Models, Molecular; D009690:Nucleic Acid Conformation; D009841:Oligonucleotides / Q000737:chemistry / Q000378:metabolism; D010441:Peptide Chain Elongation, Translational; D010455:Peptides / Q000378:metabolism; D012335:RNA, Ribosomal / Q000737:chemistry* / Q000378:metabolism; D012360:RNA, Transfer, Phe / Q000378:metabolism; D012269:Ribosomal Proteins / Q000737:chemistry / Q000378:metabolism; D012270:Ribosomes / Q000737:chemistry / Q000378:metabolism
chemical_list: D009841:Oligonucleotides; D010455:Peptides; D012335:RNA, Ribosomal; D012360:RNA, Transfer, Phe; D012269:Ribosomal Proteins