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Secondary structure comparisons between small subunit ribosomal RNA molecules from six different species
Nucleic Acids Research
|August 11, 1981
Summary
Secondary structure models reveal conserved ribosomal RNA evolution across species. These models highlight conserved secondary structures in ribosomal RNA (rRNA) molecules, indicating extensive evolutionary conservation.
Area of Science:
- Molecular Biology
- Evolutionary Biology
- Biochemistry
Background:
- Ribosomal RNA (rRNA) is essential for protein synthesis.
- Understanding rRNA secondary structure provides insights into its function and evolution.
- Comparative analysis of rRNA sequences across different organisms is crucial for evolutionary studies.
Purpose of the Study:
- To develop secondary structure models for small subunit ribosomal RNA (12S, 16S, and 18S rRNA) from diverse organisms.
- To investigate the evolutionary conservation of rRNA secondary structures.
- To identify regions accommodating length differences in rRNA molecules.
Main Methods:
- Comparative sequence analysis of homologous rRNA molecules.
- Identification of primary structural homology.
- Detection of compensating base changes in helical regions.
- Utilizing the established secondary structure of Escherichia coli 16S rRNA as a reference.
Main Results:
- Secondary structure models were generated for three pairs of small subunit rRNAs: E. coli/Zea mays (16S), Saccharomyces cerevisiae/Xenopus laevis (18S), and human/mouse (12S).
- The models demonstrate extensive conservation of rRNA secondary structure across evolution.
- Specific regions within the rRNA molecules were identified as accommodating variations in sequence length.
Conclusions:
- Ribosomal RNA secondary structure is highly conserved throughout evolution.
- Length variations in rRNA are accommodated in specific structural regions.
- These findings support a conserved functional role for rRNA secondary structure across diverse life forms.