A U3 small nuclear ribonucleoprotein-requiring processing event in the 5′ external transcribed spacer of Xenopus precursor rRNA

Edward B. Mougey, Louise K. Pape, Barbara Sollner-Webb

Research output: Contribution to journalArticle

Abstract

A processing site has been identified within the 5′ external transcribed spacer (ETS) of Xenopus laevis and X. borealis pre-RNAs, and this in vivo processing can be reproduced in vitro. It involves a stable and specific association of the pre-rRNA with factors in the cell extract, including at least four RNA-contacting polypeptides, yielding a distinct complex that sediments at 20S. Processing also requires the U3 small nuclear RNA. This processing, at residue +105 of the 713-nucleotide X. laevis 5′ ETS, is highly reminiscent of the initial processing cleavage of mouse pre-rRNA within its 3.5-kb 5′ ETS, previously thought to be mammal specific. The frog and mouse processing signals share a short essential sequence motif, and mouse factors can faithfully process the frog pre-rRNA. This conservation suggests that this 5′ ETS processing site serves an evolutionarily selective function.

Original languageEnglish (US)
Pages (from-to)5990-5998
Number of pages9
JournalMolecular and cellular biology
Volume13
Issue number10
DOIs
StatePublished - Oct 1993

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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