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. 1991 Jun;11(6):3075–3087. doi: 10.1128/mcb.11.6.3075

Mutations in the yeast RNA14 and RNA15 genes result in an abnormal mRNA decay rate; sequence analysis reveals an RNA-binding domain in the RNA15 protein.

L Minvielle-Sebastia 1, B Winsor 1, N Bonneaud 1, F Lacroute 1
PMCID: PMC360148  PMID: 1674817

Abstract

In Saccharomyces cerevisiae, temperature-sensitive mutations in the genes RNA14 and RNA15 correlate with a reduction of mRNA stability and poly(A) tail length. Although mRNA transcription is not abolished in these mutants, the transcripts are rapidly deadenylated as in a strain carrying an RNA polymerase B(II) temperature-sensitive mutation. This suggests that the primary defect could be in the control of the poly(A) status of the mRNAs and that the fast decay rate may be due to the loss of this control. By complementation of their temperature-sensitive phenotype, we have cloned the wild-type genes. They are essential for cell viability and are unique in the haploid genome. The RNA14 gene, located on chromosome H, is transcribed as three mRNAs, one major and two minor, which are 2.2, 1.5, and 1.1 kb in length. The RNA15 gene gives rise to a single 1.2-kb transcript and maps to chromosome XVI. Sequence analysis indicates that RNA14 encodes a 636-amino-acid protein with a calculated molecular weight of 75,295. No homology was found between RNA14 and RNA15 or between RNA14 and other proteins contained in data banks. The RNA15 DNA sequence predicts a protein of 296 amino acids with a molecular weight of 32,770. Sequence comparison reveals an N-terminal putative RNA-binding domain in the RNA15-encoded protein, followed by a glutamine and asparagine stretch similar to the opa sequences. Both RNA14 and RNA15 wild-type genes, when cloned on a multicopy plasmid, are able to suppress the temperature-sensitive phenotype of strains bearing either the rna14 or the rna15 mutation, suggesting that the encoded proteins could interact with each other.

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Selected References

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