RGD Reference Report - Preferential cleavage in pre-ribosomal RNA byprotein B23 endoribonuclease. - Rat Genome Database

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Preferential cleavage in pre-ribosomal RNA byprotein B23 endoribonuclease.

Authors: Savkur, RS  Olson, MO 
Citation: Savkur RS and Olson MO, Nucleic Acids Res. 1998 Oct 1;26(19):4508-15.
RGD ID: 11535027
Pubmed: PMID:9742256   (View Abstract at PubMed)
PMCID: PMC147876   (View Article at PubMed Central)

Protein B23 is an abundant nucleolar protein and a putative ribosome assembly factor which possesses an intrinsic ribonuclease activity. In the current work, the effects of RNA sequence and secondary structure on the cleavage preference by protein B23 were studied. Protein B23 ribonuclease preferentially cleaved the single-stranded homopolymers poly(A), poly(U) and poly(C). However, double-stranded co-polymers and poly(G) were resistant to cleavage. No base specificity was observed with an oligoribonucleotide substrate. The action of protein B23 ribonuclease on different regions of pre-rRNA was studied using transcripts synthesized in vitro from cloned rDNA segments. Although no specific cleavages were detected in transcripts containing sequences from the 5' external transcribed spacer or the first internal transcribed spacer, the enzyme preferentially cleaved the second internal transcribed spacer (ITS2) approximately 250 nt downstream from the 3'-end of 5.8S rRNA. Preferential cleavage was retained when the transcript was extended by 100 nt at the 3'-end, but abolished in a transcript lacking this cleavage site. Furthermore, this site was not susceptible to cleavage by RNase A or RNase T1. These results, in conjunction with the sub-nucleolar localization of the protein with elements of the processing machinery, suggest that the protein B23 endoribonuclease could play a role in pre-rRNA processing in ITS2.



Gene Ontology Annotations    Click to see Annotation Detail View

Biological Process

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
Npm1Ratcleavage in ITS2 between 5.8S rRNA and LSU-rRNA of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA)  IDA  RGD 

Objects Annotated

Genes (Rattus norvegicus)
Npm1  (nucleophosmin 1)


Additional Information