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Concurrent neutral evolution of mRNA secondary structures and encoded proteins.
J Konecny1, M Schöniger, I Hofacker
1Theorectical Chemistry, Tech University Munich, Lichtenbergstr. 4, D 85747 Garching, Germany.
Journal of Molecular Evolution
|February 7, 2001
Summary
The natural genetic code balances RNA secondary structure and protein function. Compensatory mutations in retroviral mRNA allow for protein evolution while maintaining crucial RNA structures.
Area of Science:
- Molecular Biology
- Genetics
- Bioinformatics
Background:
- Messenger RNA (mRNA) must maintain functional secondary structures alongside protein-coding sequences.
- Retroviral mRNA presents a unique case for studying the interplay between RNA structure and genetic coding.
Purpose of the Study:
- To investigate if the natural genetic code is adapted for complementary coding in retroviral mRNA.
- To analyze the evolutionary compatibility of maintaining RNA secondary structure with protein functional exploration.
Main Methods:
- Statistical analysis of retroviral mRNA sequences.
- Examination of mutations in stem regions of mRNA foldings.
- Quantification of amino acid conservation using physicochemical properties.
Main Results:
- Retroviral mRNA supports the hypothesis of adaptation to complementary coding.
- Silent mutations on one strand are often accompanied by conservative mutations on the other in stem regions.
- Preservation of RNA secondary structure via compensatory mutations is evolutionarily compatible with protein variant exploration.
Conclusions:
- The natural genetic code facilitates efficient protein exploration through mutations while preserving essential RNA secondary structures.
- Compensatory mutations play a key role in balancing structural integrity and functional adaptability in retroviral mRNA.