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Modification of yeast ribosomal proteins. Methylation.
The Biochemical Journal
|October 1, 1978
Summary
This study identified four methylated yeast ribosomal proteins (S31, S32, L15, L41) using advanced gel electrophoresis. Methylation primarily occurs on lysine and arginine residues, offering insights into protein modification.
Area of Science:
- Molecular Biology
- Biochemistry
- Yeast Genetics
Background:
- Ribosomal proteins are essential for protein synthesis.
- Post-translational modifications, like methylation, can regulate protein function.
- Understanding yeast ribosomal protein modification is crucial for cellular processes.
Purpose of the Study:
- To identify methylated ribosomal proteins in yeast.
- To determine the specific amino acid residues involved in methylation.
- To quantify the extent of methylation in identified proteins.
Main Methods:
- Yeast cells were uniformly labeled in vivo with [methyl-3H]methionine and [1-14C]methionine.
- Two-dimensional polyacrylamide-gel electrophoresis was employed for protein separation and analysis.
- Radioactive labeling allowed for the detection and quantification of methylated proteins.
Main Results:
- Four yeast ribosomal proteins were identified as methylated: S31, S32, L15, and L41.
- Lysine and arginine were found to be the primary amino acid acceptors of methyl groups.
- The degree of methylation ranged from 0.09 to 0.20 methyl groups per modified ribosomal protein.
Conclusions:
- The study successfully identified specific methylated ribosomal proteins in yeast.
- Methylation of yeast ribosomal proteins predominantly involves lysine and arginine residues.
- These findings contribute to the understanding of ribosomal protein regulation and function through post-translational modification.