The Primordial Metabolism: Linking Amino Acid Biosynthesis
Author Information
Author(s): Marco Fondi, Matteo Brilli, Giovanni Emiliani, Donatella Paffetti, Renato Fani
Primary Institution: Università di Firenze
Hypothesis
The study aims to trace the evolutionary pathway leading to the appearance of the extant biosynthetic routes for lysine, arginine, and leucine.
Conclusion
Primordial cells likely synthesized leucine, lysine, and arginine through a single common metabolic pathway that underwent duplication events before the last common universal ancestor appeared.
Supporting Evidence
- The study suggests that ancestral enzymes had broad substrate specificity, allowing for the interconnection of different metabolic pathways.
- Gene duplication events are proposed to have played a key role in the evolution of these biosynthetic pathways.
- The model indicates that the DAP pathway for lysine biosynthesis appeared earlier than the AAA pathway.
Takeaway
A long time ago, simple cells could make important building blocks like lysine, leucine, and arginine using just one method, which later split into different ways to make these building blocks.
Methodology
Comparative analysis of genes involved in lysine, leucine, and arginine biosynthesis across various organisms.
Digital Object Identifier (DOI)
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