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Published on: April 22, 2021
Analysis of pre-mRNA and pre-rRNA processing factor Snu13p structure and mutants
Helen C Dobbyn1, Paul A McEwan, Andre Krause
1School of Pharmacy, Centre for Biomolecular Sciences, University of Nottingham, Nottingham NG7 2RD, UK.
Biochemical and Biophysical Research Communications
|July 17, 2007
Summary
Snu13p protein is crucial for RNA processing in yeast. New temperature-sensitive mutants reveal indirect mechanisms affecting RNA binding and ribonucleoprotein assembly.
Area of Science:
- Molecular Biology
- Yeast Genetics
- Structural Biology
Background:
- Snu13p is an essential Saccharomyces cerevisiae protein involved in pre-messenger RNA splicing and pre-ribosomal RNA processing.
- It binds U4 snRNA and box C/D snoRNAs, facilitating ribonucleoprotein complex assembly.
Purpose of the Study:
- To perform structural and biochemical analysis of Snu13p.
- To investigate the function of Snu13p in ribonucleoprotein assembly through the creation and analysis of temperature-sensitive mutants.
Main Methods:
- X-ray crystallography to determine the structure of Snu13p.
- Biochemical assays to assess RNA binding affinities of wild-type and mutant Snu13p.
- Site-directed mutagenesis to create temperature-sensitive mutants (L67W and I102A).
Main Results:
- The crystal structure of Snu13p identified a potential protein interaction region.
- Temperature-sensitive mutants L67W and I102A showed significantly reduced binding to U4 snRNA and U3 snoRNA.
- These mutations, located outside the known RNA binding site, suggest an indirect influence on RNA binding.
Conclusions:
- Snu13p's structure provides insights into its role in ribonucleoprotein assembly.
- The generated temperature-sensitive mutants are valuable tools for studying Snu13p function.
- Mutations in Snu13p can indirectly impair RNA binding, highlighting complex regulatory mechanisms in ribonucleoprotein complex formation.
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