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Are stop codons recognized by base triplets in the large ribosomal RNA subunit?
Han Liang1, Laura F Landweber, Jacques R Fresco
1Department of Molecular Biology, Princeton University, Princeton, NJ 08544, USA.
RNA (New York, N.Y.)
|October 4, 2005
Summary
A new model for stop codon recognition using ribosomal RNA (rRNA) hairpin loops was tested. Bioinformatic analysis revealed inconsistencies, weakening the proposed mechanism for translation termination.
Area of Science:
- Molecular Biology
- Genetics
- Bioinformatics
Background:
- The precise mechanism of stop codon recognition during protein translation termination remains incompletely understood.
- A prior model proposed that 3-nucleotide Ter-anticodons in large ribosomal subunit (LSU) rRNA hairpin loops recognize stop codons in eubacteria and organelles.
Purpose of the Study:
- To evaluate the proposed Ter-anticodon model for stop codon recognition.
- To investigate the validity of this model across a broader range of species.
Main Methods:
- Extensive bioinformatic analysis was employed.
- Stop codons and putative Ter-anticodons were analyzed across diverse species.
Main Results:
- The model failed to explain stop codon usage in many cases without invoking non-complementary base pairing.
- The structural stringency of the ribosomal A-site and preferential sense codon pairing challenge the model's assumptions.
Conclusions:
- The proposed Ter-anticodon model for stop codon recognition is significantly weakened by bioinformatic and structural considerations.
- Alternative mechanisms or modifications to the model may be necessary to fully explain translation termination.