Related Experiment Videos
A potential membrane protein involved in pre-tRNA splicing of Schizosaccharomyces pombe
Minjung Kim1, Kuchan Hwang, Chang Jin Lim
1Department of Genetic Engineering, Chongju University, Chongju, South Korea.
Insights
Researchers identified the Ptp4(+) gene in Schizosaccharomyces pombe, crucial for pre-transfer RNA (tRNA) splicing. This gene encodes a membrane protein that, when expressed in mutants, restores tRNA splicing, suggesting its role in this essential cellular process.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- Pre-transfer RNA (tRNA) splicing is a critical post-transcriptional modification process.
- Six pre-tRNA splicing mutants (ptp1-ptp6) were previously isolated in Schizosaccharomyces pombe.
Purpose of the Study:
- To investigate the molecular mechanism of tRNA splicing.
- To identify and characterize the gene responsible for the ptp4(-) mutant phenotype.
Main Methods:
- Gene cloning by complementation of temperature-sensitive growth defect.
- Sequence analysis of the cloned gene.
- Complementation analysis by expressing the cloned gene in the mutant.
- Northern blot analysis to assess gene expression.
Main Results:
- The ptp4(+) gene was cloned and found to encode a putative 24.4 kDa membrane protein with four membrane-spanning regions.
- The ptp4(+) gene shows similarity to Saccharomyces cerevisiae YOR311C.
- Expression of ptp4(+) in the ptp4(-) mutant restored tRNA splicing ability.
- ptp4(+) is expressed in both mating-type cells of S. pombe.
Conclusions:
- The Ptp4(+) protein is likely involved in the tRNA splicing pathway in Schizosaccharomyces pombe.
- Ptp4(+) may function as a membrane-associated component in tRNA splicing.
Abstract:
We had previously isolated six pre-tRNA splicing mutants of Schizosaccharomyces pombe named ptp1 to ptp6. To investigate the molecular mechanism of tRNA splicing, we cloned the ptp4(+) gene by complementation of the temperature-sensitive growth defect. The ptp4(+) gene consists of three exons and encodes a putative protein of 218 amino acids with a molecular mass of 24.4 kDa. Analysis of the amino acid sequence reveals that the protein is a potential membrane protein with four membrane-spanning regions. The ptp4(+) shows significant similarity to the Saccharomyces cerevisiae putative protein YOR311C. Expression of the ptp4(+) gene in the ptp4(-) mutant restores the ability to splice tRNA. Northern blot analysis showed that the ptp4(+) gene is expressed in both mating-type cells of S. pombe. These results suggest that the Ptp4(+) could be a component involved in tRNA splicing.