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Globular proteins, GU wobbling, and the evolution of the genetic code
Journal of Molecular Evolution
|January 1, 1982
Summary
Early RNA replication with GU wobbling may explain the amino acid composition of modern protein interiors. This extensive wobbling, near stability limits, influenced genetic code and protein evolution.
Area of Science:
- Molecular Biology
- Biochemistry
- Evolutionary Biology
Background:
- RNA replication fidelity is crucial for biological systems.
- The formation of GU base pairs during RNA copying leads to non-random base triplet distributions.
- Previous studies indicated G and U accumulation in replicating RNA strands.
Purpose of the Study:
- To calculate the distribution of base triplets resulting from GU wobbling.
- To establish a correlation between RNA base triplet distribution and protein amino acid composition.
- To propose a hypothesis linking early RNA replication to current protein structures.
Main Methods:
- Calculation of base triplet distribution in replicating RNA.
- Application of the Chi-squared (X2) test.
- Analysis of amino acid composition in evolutionarily conserved protein regions.
Main Results:
- A significant correlation was found between RNA base triplet distribution and protein interior amino acid composition.
- The study quantifies the non-random distribution of base triplets.
- Evidence suggests extensive GU wobbling in early RNA replication.
Conclusions:
- GU wobbling in early RNA replication could be the driving force behind the amino acid composition of modern protein interiors.
- This hypothesis implies that early RNA replication was imprecise and involved extensive GU wobbling.
- The findings have implications for understanding the evolution of the genetic code and proteins.
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