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Evolution of the transfer RNA molecule.
Zeitschrift Fur Naturforschung. Section C, Biosciences
|May 1, 1977
Summary
Transfer RNA (tRNA) molecules contain repeating, homologous base sequences. These sequences suggest that early adapter molecules, not the full tRNA, were the first step in tRNA evolution under primordial conditions.
Area of Science:
- Molecular Biology
- Evolutionary Biology
- Biochemistry
Background:
- Transfer RNA (tRNA) molecules are essential for protein synthesis, translating genetic information into amino acid sequences.
- Analysis of various tRNA species reveals recurring homologous regions within and between different tRNA molecules.
- These homologous regions range from 6 to 20 nucleotides in length.
Purpose of the Study:
- To propose an evolutionary origin for tRNA molecules based on observed sequence homologies.
- To investigate the significance of homologous oligonucleotides in the context of early molecular evolution.
Main Methods:
- Comparative sequence analysis of diverse tRNA species.
- Identification and characterization of homologous nucleotide sequences within tRNA molecules.
- Hypothesis formulation based on evolutionary principles and sequence data.
Main Results:
- Consistent identification of homologous oligonucleotide sequences (6-20 nucleotides) across various tRNA species.
- Homologies observed both intramolecularly (within a single tRNA) and intermolecularly (between different tRNAs).
Conclusions:
- The complex structure of modern tRNA molecules likely did not form in a single step under primordial conditions.
- The homologous oligonucleotides found in contemporary tRNAs are proposed as remnants of primitive adapter molecules.
- These primitive adapters represent the earliest evolutionary precursors to modern tRNA molecules.