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Linker 2 of the eukaryotic pre-ribosomal processing factor Mrd1p is an essential interdomain functionally coupled to
Fredrik Lackmann1, Sergey Belikov1, Lars Wieslander1
1Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, Stockholm, Sweden.
Plos One
|April 8, 2017
Summary
The Linker 2 region of Mrd1p is crucial for small ribosomal subunit synthesis in yeast. Mutations in this linker disrupt pre-ribosomal processing, leading to cell growth defects and protein instability.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Ribosome synthesis is vital for all cells, involving complex rRNA processing and assembly.
- In Saccharomyces cerevisiae, the 40S ribosomal subunit is generated from a 90S pre-ribosomal complex.
- Mrd1p is an essential factor for cleaving 35S pre-rRNA to produce 18S rRNA.
Purpose of the Study:
- To investigate the functional role of Linker 2 in the conserved protein Mrd1p.
- To determine the impact of Linker 2 mutations on Mrd1p function and ribosome biogenesis.
Main Methods:
- Analysis of Linker 2 mutations in Mrd1p.
- Assessment of pre-ribosomal processing and cell growth.
- Investigation of Mrd1p protein stability.
Main Results:
- Linker 2 is essential for Mrd1p function in pre-ribosomal processing.
- Extensive and specific mutations in Linker 2 impede 40S ribosome synthesis and cell viability.
- Linker 2 mutations cause Mrd1p instability and degradation.
Conclusions:
- Linker 2 plays a critical role in Mrd1p function beyond spacing RNA Binding Domains (RBDs).
- Linker 2 is functionally coupled with RBD2, suggesting they form a functional module.
- The structural integrity and specific residues of Linker 2 are vital for ribosome biogenesis.