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Comparative analysis of base biases around the stop codons in six eukaryotes
1Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310029, China. liuqp@genomics.org.cn
Bio Systems
|June 28, 2005
Summary
Sequence patterns near stop codons in eukaryotes are highly biased, suggesting an extended translation termination signal. Conserved residues in eukaryotic release factor 1 (eRF1) may be key to this recognition process.
Area of Science:
- Molecular Biology
- Genetics
- Bioinformatics
Background:
- Translation termination relies on stop codons recognized by release factors.
- Sequence context surrounding stop codons can influence translation efficiency and termination.
Purpose of the Study:
- To investigate sequence patterns around stop codons in eukaryotes.
- To identify conserved residues in eukaryotic release factor 1 (eRF1) potentially involved in stop codon recognition.
Main Methods:
- Comparative analysis of full-length cDNA sequences from six eukaryotic species.
- Multiple amino acid sequence alignment of eukaryotic release factor 1 (eRF1) from 20 species.
Main Results:
- Significant sequence bias was observed at positions -1 and +1 relative to stop codons, particularly at the second position of the -1 codon (rich in A/U) and the first position of the +1 codon (purine-rich).
- A conserved sequence pattern from position -2 to +4 might function as an extended translation termination signal.
- 16 strictly conserved residue sites were identified in eRF1, including invariant Ile70 and Lys71.
Conclusions:
- The biased sequence patterns around stop codons likely contribute to an extended translation termination signal.
- Conserved amino acids in eRF1, such as Ile70 and Lys71, are potentially crucial for recognizing stop signals during translation termination.