Related Experiment Videos
Ribosomal protein L16 binds to the 3'-end of transfer RNA
FEBS Letters
|January 23, 1984
Abstract:
Escherichia coli 50 S ribosomal subunits were reconstituted with and without protein L16 present. The latter particles, although active in puromycin reaction, were unable to use CACCA-Phe as an acceptor substrate. We also found that L16 interacts directly with this oligonucleotide and, in the complex with tRNA, protects its 3'-end from pancreatic ribonuclease digestion. We suggest that the role of L16 is in the fixation of the aminoacyl stem of tRNA to the ribosome at its A-site.
Insights
Protein L16 is crucial for Escherichia coli ribosomes to bind tRNA substrates. Without L16, ribosomes can
Area of Science:
- Molecular Biology
- Ribosome Function
- Protein-Nucleic Acid Interactions
Background:
- The 50 S ribosomal subunit is essential for protein synthesis in Escherichia coli.
- Specific ribosomal proteins play critical roles in substrate binding and translation fidelity.
Purpose of the Study:
- To investigate the role of protein L16 in the function of the 50 S ribosomal subunit.
- To determine the interaction of protein L16 with tRNA and oligonucleotide substrates.
Main Methods:
- Reconstitution of 50 S ribosomal subunits with and without protein L16.
- Assay of ribosomal activity using puromycin and CACCA-Phe as substrates.
- Analysis of protein L16 interaction with oligonucleotides and tRNA using nuclease protection assays.
Main Results:
- Ribosomes reconstituted without protein L16 were active in the puromycin reaction but could not utilize CACCA-Phe.
- Protein L16 directly interacts with the oligonucleotide substrate.
- Protein L16 protects the 3'-end of tRNA in a complex with the oligonucleotide from ribonuclease digestion.
Conclusions:
- Protein L16 is essential for the binding of aminoacyl-tRNA to the ribosomal A-site.
- L16 likely functions by stabilizing the interaction between the aminoacyl stem of tRNA and the ribosome.