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Reconstructing ancient protein alphabets: what can we truly infer?
Stephen D Fried1, Georg Hochberg2, Klara Hlouchova3
1T.C. Jenkins Department of Biophysics, Johns Hopkins University, Baltimore, MD 21218, USA; Department of Chemistry, Johns Hopkins University, Baltimore, MD 21218, USA.
Trends in Genetics : TIG
|March 27, 2026
Summary
The origin of the 20 standard amino acids involved metabolic innovation and selection for protein structure. Converging evidence from multiple fields clarifies the timeline of amino acid recruitment in early life.
Area of Science:
- Biochemistry
- Evolutionary Biology
- Molecular Biology
Background:
- The canonical amino acid alphabet is evolutionarily ancient and stable.
- The factors driving the emergence of this alphabet are debated.
- Previous hypotheses focused on prebiotic availability and metabolic pathways.
Purpose of the Study:
- To synthesize insights from diverse evidence lines on amino acid alphabet emergence.
- To address inconsistencies in proposed amino acid recruitment trajectories.
- To establish a reliable chronology for amino acid recruitment.
Main Methods:
- Comparative analysis of evidence from protein biophysics.
- Integration of findings from deep phylogenetics.
- Evaluation of metabolic pathway expansion.
- Assessment of prebiotic chemical availability.
Main Results:
- The canonical alphabet likely arose from a limited chemical set.
- Metabolic innovation and selection for protein function progressively refined the alphabet.
- Different lines of evidence present partially conflicting evolutionary timelines.
- Convergence of evidence offers a more robust chronological framework.
Conclusions:
- A unified understanding of amino acid alphabet evolution requires integrating multiple data sources.
- The timeline of amino acid recruitment is best determined by consensus across different approaches.
- Further research should focus on reconciling divergent evolutionary trajectories.
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