Jun 22, 2005

Regulation and surveillance of normal and 3'-extended forms of the yeast aci-reductone dioxygenase mRNA by RNase III cleavage and exonucleolytic degradation

The Journal of Biological Chemistry
Cindy Zer, Guillaume Chanfreau

Abstract

Aci-reductone dioxygenases are key enzymes in the methionine salvage pathway. The mechanisms by which the expression of this important class of enzymes is regulated are poorly understood. Here we show that the expression of the mRNA encoding the yeast aci-reductone dioxygenase ADI1 is controlled post-transcriptionally by RNase III cleavage. Cleavage occurs in a large bipartite stem loop structure present in the open reading frame region of the ADI1 mRNA. The ADI1 mRNA is up-regulated in the absence of the yeast orthologue of RNase III Rnt1p or of the 5' --> 3' exonucleases Xrn1p and Rat1p. 3'-Extended forms of this mRNA, including a polycistronic mRNA ADI1-YMR010W mRNA, also accumulate in cells lacking Rnt1p, Xrn1p, and Rat1p or the nuclear exosome component Rrp6p, suggesting that these 3'-extended forms are subject to nuclear surveillance. We show that the ADI1 mRNA is up-regulated under heat shock conditions in a Rnt1p-independent manner. We propose that Rnt1p cleavage targets degradation of the ADI1 mRNA to prevent its expression prior to heat shock conditions and that RNA surveillance by multiple ribonucleases helps prevent accumulation of aberrant 3'-extended forms of this mRNA that arise from intrinsically inefficient 3'-...Continue Reading

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Mentioned in this Paper

Exosomes
Saccharomyces cerevisiae Proteins
Reductone
RNA Conformation
EXOSC10 gene
Enzymes, antithrombotic
Proteins, Recombinant DNA
Cytokinesis of the Fertilized Ovum
L-methionine Salvage from Methylthioadenosine
Cell Nucleus

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