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The PRP31 gene encodes a novel protein required for pre-mRNA splicing in Saccharomyces cerevisiae
E M Weidenhammer1, M Singh, M Ruiz-Noriega
1Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, PA 15213 USA.
Abstract:
The pre-mRNA splicing factor Prp31p was identified in a screen of temperature-sensitive yeast strains for those exhibiting a splicing defect upon shift to the non- permissive temperature. The wild-type PRP31 gene was cloned and shown to be essential for cell viability. The PRP31 gene is predicted to encode a 60 kDa polypeptide. No similarities with other known splicing factors or motifs indicative of protein-protein or RNA-protein interaction domains are discernible in the predicted amino acid sequence. A PRP31 allele bearing a triple repeat of the hemagglutinin epitope has been generated. The tagged protein is functional in vivo and a single polypeptide species of the predicted size was detected by Western analysis with proteins from yeast cell extracts. Functional Prp31p is required for the processing of pre-mRNA species both in vivo and in vitro, indicating that the protein is directly involved in the splicing pathway.
Insights
Researchers identified the pre-messenger RNA (pre-mRNA) splicing factor Prp31p, essential for yeast cell viability. This protein directly participates in pre-mRNA processing, crucial for the splicing pathway.
Area of Science:
- Molecular Biology
- Yeast Genetics
Background:
- Pre-mRNA splicing is a fundamental process in gene expression.
- Identifying novel splicing factors is crucial for understanding its regulation.
Purpose of the Study:
- To identify and characterize novel pre-mRNA splicing factors.
- To elucidate the role of Prp31p in the splicing pathway.
Main Methods:
- Screening of temperature-sensitive yeast mutants for splicing defects.
- Cloning and characterization of the wild-type PRP31 gene.
- Generation and analysis of a hemagglutinin-tagged Prp31p.
- Western blot analysis of yeast cell extracts.
Main Results:
- Prp31p was identified as essential for yeast cell viability.
- The PRP31 gene encodes a 60 kDa polypeptide with no discernible interaction domains.
- Tagged Prp31p is functional in vivo, and its presence was confirmed by Western analysis.
- Functional Prp31p is required for pre-mRNA processing both in vivo and in vitro.
Conclusions:
- Prp31p is a novel and essential pre-mRNA splicing factor.
- Prp31p plays a direct role in the mRNA splicing pathway.
- Further studies are needed to understand the specific mechanism of Prp31p in splicing.