title: The ribonuclease-III-processing site near the 5' end of an RNA precursor of bacteriophage T4 and its effect on termination.
abstract: Infection of RNase III- (rnc) Escherichia coli cells with bacteriophage T4 delta 27, a deletion mutant missing seven out of the ten genes in the tRNA transcription unit, results in the accumulation of a tRNA precursor (10.5-S RNA) that contains the sequences of tRNAGln, tRNALeu and species 1 RNA [Pragai and Apirion (1981) J. Mol. Biol. 153, 619-630]. In vitro studies, using partially purified RNase III or cell extracts and 10.5-S RNA as substrate, have revealed a cleavage site at the 5' side of the molecule. A computerized secondary structure suggests that the RNase III cleavage site can be placed in a small bulge which could be part of a duplex structure and is adjacent to A-A-G and its complementary sequence U-U-U in the same relative relationships found for most RNase III cleavage sites were the adjacent sequences are (A-A-G/U-U-C). Under normal processing conditions (presence of RNase III) the 3' end of the processed intermediate precursors, 10.1-S and p2Sp1 RNAs, is C-U-U-(U1-2)-UOH, which is determined by a stem and loop structure that could serve as a rho-independent termination signal site. However, in the absence of RNase III, the accumulated 10.5-S precursor RNA does not terminate at the same site and its 3' end is shifted a few nucleotides downstream. Thus, RNase III, besides playing a role in processing of 10.5-S RNA, also affects the termination of that molecule, even though both sites, the RNase III cleavage site and the termination site, are about 390 nucleotides apart.
mesh_terms: D001665:Binding Sites; D055598:Chemical Phenomena; D002621:Chemistry; D004591:Electrophoresis, Polyacrylamide Gel; D004722:Endoribonucleases / Q000378:metabolism*; D029968:Escherichia coli Proteins; D009690:Nucleic Acid Conformation; D009694:Nucleic Acid Precursors / Q000302:isolation & purification*; D010443:Peptide Chain Termination, Translational; D012367:RNA, Viral / Q000096:biosynthesis*; D043244:Ribonuclease III; D013604:T-Phages / Q000235:genetics*; D014158:Transcription, Genetic
chemical_list: D029968:Escherichia coli Proteins; D009694:Nucleic Acid Precursors; D012367:RNA, Viral; D004722:Endoribonucleases; D043244:Ribonuclease III; C468366:ribonuclease III, E coli