title: The Nop5-L7A-fibrillarin RNP complex and a novel box C/D containing sRNA of Halobacterium salinarum NRC-1.
abstract: RNA 2'O-methylation is a frequent modification of rRNA and tRNA and supposed to influence RNA folding and stability. Ribonucleoprotein (RNP) complexes, containing the proteins Nop5, L7A, fibrillarin, and a box C/D sRNA, are guided for 2'O-methylation by interactions of their RNA component with their target RNA. In vitro complex assembly was analyzed for several thermophilic Archaea but in vivo studies are rare, even unavailable for halophilic Archaea. To analyze the putative box C/D RNP complex in the extremely halophilic Halobacterium salinarum NRC-1 we performed pull-down analysis and identified the proteins Nop5, L7A, and fibrillarin and the tRNA(Trp) intron, as a typical box C/D sRNA of this RNP complex in vivo. We show for the first time a ribonucleolytic activity of the purified RNP complex proteins, as well as for the RNP complex containing pull-down fractions. Furthermore, we identified a novel RNA (OE4630R-3'sRNA) as part of the complex, containing the typical boxes C/D and C'/D' sequence motifs and being twice as abundant as the tRNA(Trp) intron.
authors.affiliation: Institut für Mikrobiologie und Molekularbiologie, University of Giessen, Heinrich-Buff-Ring 26-32, D-35392 Giessen, Germany.
authors.forename: Jasmin
authors.initials: J
authors.lastname: Weisel
authors.forename: Steffen
authors.initials: S
authors.lastname: Wagner
authors.forename: Gabriele
authors.initials: G
authors.lastname: Klug
mesh_terms: D002868:Chromosomal Proteins, Non-Histone / Q000378:metabolism*; D019617:Halobacterium salinarum / Q000235:genetics / Q000378:metabolism*; D007438:Introns / Q000235:genetics; D012364:RNA, Transfer, Trp / Q000235:genetics; D020718:Ribonucleoproteins, Small Nucleolar / Q000378:metabolism*; D012269:Ribosomal Proteins / Q000378:metabolism*
chemical_list: D002868:Chromosomal Proteins, Non-Histone; D012364:RNA, Transfer, Trp; D020718:Ribonucleoproteins, Small Nucleolar; D012269:Ribosomal Proteins; C047458:fibrillarin