Cbp1p is required for message stability following 5'-processing of COB mRNA

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Abstract

Cbp1p is a nuclear encoded protein required for the stabilization of mitochondrial COB mRNA, which codes for apocytochrome b in the yeast Saccharomyces cerevisiae. The COB gene is cotranscribed with the upstream tRNA(Glu) gene. Release of tRNA(Glu) from the initial transcript generates a precursor mRNA with a 5'-end at position -1098. The 5'-end of mature COB message is generated by cleavage of the pre-mRNA at nucleotide -955 or -954. Previous work indicated that Cbp1p acts through cis-elements near these cleavage sites. Here we have tested whether Cbp1p stabilizes COB mRNA solely by stimulating the processing of COB precursor RNA at nucleotide -955/-954. Yeast strain TG955 was constructed such that the -955 COB mRNA 5'-processing site coincides with the upstream tRNA 3'-endonuclease site at position - 1098, allowing the 5'-end of COB mRNA to be formed by the tRNA 3'-processing enzyme. Respiratory growth and stability of COB mRNA in TG955 are Cbp1p- dependent. Therefore, we conclude that Cbp1p is important for the stabilization of COB mRNA after 5'-processing.

Original languageEnglish (US)
Pages (from-to)16574-16578
Number of pages5
JournalJournal of Biological Chemistry
Volume269
Issue number24
StatePublished - 1994

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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