title: RNase E is involved in 5'-end 23S rRNA processing in alpha-Proteobacteria.
abstract: In Rhodobacter capsulatus and Rhizobium leguminosarum, an internal transcribed spacer consisting of helices 9 and 10 is removed during 23S rRNA processing, which leads to the occurrence of a 5.8S-like rRNA. The particular rRNA maturation steps are not known, with exception of the initial RNase III cleavage in helix 9. We found that GC-rich stem-loop structures of helix 9, which are released by RNase III, are immediately degraded. The degradation of helix 10 is slower and its kinetics differs in both species. Nevertheless, the helix 10 processing mechanism is conserved and includes cleavages by RNase E.
authors.affiliation: Institut für Mikrobiologie und Molekularbiologie der Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 26-32, 35392 Giessen, Germany.
authors.forename: Franziska
authors.initials: F
authors.lastname: Klein
authors.forename: Elena
authors.initials: E
authors.lastname: Evguenieva-Hackenberg
mesh_terms: D020561:Alphaproteobacteria / Q000201:enzymology* / Q000235:genetics; D001483:Base Sequence; D004722:Endoribonucleases / Q000378:metabolism / Q000502:physiology*; D007438:Introns; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D012323:RNA Processing, Post-Transcriptional; D012329:RNA, Bacterial / Q000737:chemistry / Q000378:metabolism*; D012338:RNA, Ribosomal, 23S / Q000737:chemistry / Q000378:metabolism*; D012231:Rhizobium / Q000235:genetics; D016992:Rhodobacter / Q000235:genetics; D043244:Ribonuclease III; D013379:Substrate Specificity
chemical_list: D012329:RNA, Bacterial; D012338:RNA, Ribosomal, 23S; D004722:Endoribonucleases; D043244:Ribonuclease III; C022537:ribonuclease E