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Thermodynamics of Potential CHO Metabolites in a Reducing Environment
Jeremy Kua1, Alexandra L Hernandez1, Danielle N Velasquez1
1Department of Chemistry & Biochemistry, University of San Diego, San Diego, CA 92110, USA.
Life (Basel, Switzerland)
|October 23, 2021
Summary
Researchers explored the origins of metabolism using quantum chemistry. They identified acetate as a key molecule in early metabolic cycles, alongside other simple prebiotic compounds.
Area of Science:
- Astrobiology
- Biochemistry
- Quantum Chemistry
Background:
- Investigating the origin of metabolism is crucial for understanding early life.
- Prebiotic chemistry seeks to identify simple molecules and reactions that could have supported early life.
Purpose of the Study:
- To explore the thermodynamic feasibility of proto-metabolic cycles.
- To identify potential prebiotic molecules that could sustain early metabolism.
Main Methods:
- Utilized first-principles quantum chemistry to calculate free energies of CHO compounds in aqueous solution.
- Analyzed thermodynamic cycles for carbon dioxide fixation using hydrogen as a reductant.
Main Results:
- Highlighted the thermodynamic favorability of certain reactions based on redox states.
- Identified acetate as a significant molecule in proto-metabolic cycles.
- Showcased connections between acetate and other prebiotic molecules like glyoxalate.
Conclusions:
- Acetate likely played a vital role in early metabolic pathways.
- Simple CHO compounds and their thermodynamic properties are key to understanding metabolism's origin.
- Redox state analysis is essential for evaluating prebiotic reaction feasibility.
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