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The primary structure of rat liver ribosomal protein L39
Abstract:
The covalent structure of the rat liver 60 S ribosomal subunit protein L39 was determined. Fourteen tryptic peptides were purified, and the sequence of each was established by a micromanual procedure; they accounted for all 50 residues of L39. The sequence of the NH2-terminal 32 residues of L39, obtained by automated Edman degradation of the intact protein, provided the alignment of the first seven tryptic peptides. Two peptides, CNI (28 residues) and CNII (22 residues), were produced by cleavage of protein L39 with cyanogen bromide and the sequence of CNII was determined by automated Edman degradation. This sequence established the order of tryptic peptides T8 through T14. The carboxyl-terminal amino acids were identified after carboxypeptidase A treatment. Protein L39 contains 50 amino acids and has a molecular weight of 7308. There are indications that a portion of rat L39 is related to a fragment of Escherichia coli ribosomal protein S1.
Insights
Researchers determined the covalent structure of rat liver ribosomal protein L39. This 50-amino acid protein has a molecular weight of 7308 and shows potential relation to E. coli ribosomal protein S1.
Area of Science:
- Molecular Biology
- Protein Chemistry
- Genomics
Background:
- Ribosomes are essential molecular machines responsible for protein synthesis.
- Ribosomal proteins play crucial roles in ribosome structure and function.
- Understanding the structure of ribosomal proteins is key to deciphering protein synthesis mechanisms.
Purpose of the Study:
- To elucidate the complete covalent structure of rat liver 60 S ribosomal subunit protein L39.
- To provide a detailed amino acid sequence for rat L39.
- To investigate potential evolutionary relationships with other ribosomal proteins.
Main Methods:
- Purification and sequencing of fourteen tryptic peptides.
- Automated Edman degradation of the intact protein and cyanogen bromide-cleaved peptides.
- Carboxypeptidase A treatment for carboxyl-terminal analysis.
Main Results:
- The complete amino acid sequence of rat liver L39, comprising 50 residues, was determined.
- The molecular weight of rat L39 was established as 7308.
- Sequence analysis revealed potential homology between rat L39 and a fragment of Escherichia coli ribosomal protein S1.
Conclusions:
- The covalent structure of rat liver 60 S ribosomal subunit protein L39 has been fully characterized.
- The findings provide a foundation for further studies on L39's role in ribosomal function.
- The identified homology suggests conserved structural or functional elements in ribosomal proteins across species.