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Rna14p, a component of the yeast nuclear cleavage/polyadenylation factor I, is also localised in mitochondria
J M Rouillard1, C Brendolise, F Lacroute
1Centre de Génétique Moléculaire du CNRS, Gif sur Yvette, France.
Abstract:
RNA14 was identified as a gene involved in premessenger RNA cleavage and polyadenylation. These processing steps take place in the nucleus, but the Rna14p protein is distributed in both the nucleus and the cytoplasm. By subcellular fractionation, we show here that the cytoplasmic fraction is localised in the mitochondria. In order to understand the role played by Rna14p in mitochondria, we have searched for new thermosensitive alleles of RNA14. We isolated thirteen new mutants. Some of them are deficient in mRNA cleavage and polyadenylation at the restrictive temperature - like the first mutant identified (rna14-1). However, others do not appear to be impaired in any of the steps in RNA metabolism investigated, nor do they appear to be involved in the replication or expression of mitochondrial DNA or in respiration. The localisation data strongly suggest that, besides an essential function in mRNA polyadenylation, the Rna14p protein has a non essential function in mitochondrial metabolism.
Insights
The RNA14 gene product, Rna14p, plays a crucial role in messenger RNA (mRNA) processing. New research reveals Rna14p also has a non-essential function in mitochondria, impacting cellular metabolism.
Area of Science:
- Molecular Biology
- Cell Biology
- Genetics
Background:
- The RNA14 gene is known to be involved in essential nuclear processes of pre-messenger RNA (mRNA) cleavage and polyadenylation.
- The Rna14p protein exhibits dual localization in both the nucleus and cytoplasm.
Purpose of the Study:
- To investigate the role of the Rna14p protein in mitochondria.
- To identify new functions of RNA14 beyond its established role in mRNA processing.
Main Methods:
- Subcellular fractionation to determine Rna14p localization.
- Isolation and characterization of thirteen new thermosensitive RNA14 mutants.
- Analysis of mRNA cleavage and polyadenylation, mitochondrial DNA replication and expression, and respiration in mutant strains.
Main Results:
- Subcellular fractionation confirmed Rna14p localization in mitochondria.
- Thirteen new thermosensitive RNA14 mutants were isolated.
- Some mutants showed defects in mRNA processing, while others did not affect known RNA metabolism, mitochondrial DNA, or respiration.
Conclusions:
- Rna14p possesses an essential function in nuclear mRNA polyadenylation.
- Rna14p also has a non-essential role in mitochondrial metabolism, suggesting a dual function for this protein.