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Volatile Organic Compound Metabolism on Early Earth
S Marshall Ledford1, Laura K Meredith2,3
1Genetics Graduate Interdisciplinary Program, University of Arizona, Tucson, AZ, 85721, USA. sledford@arizona.edu.
Journal of Molecular Evolution
|July 17, 2024
Summary
Researchers identified potential volatile organic compounds (VOCs) metabolized by the last universal common ancestor (LUCA). This study explores early life
Area of Science:
- Biogeochemistry
- Early Life Metabolism
- Atmospheric Chemistry
Background:
- Biogenic volatile organic compounds (VOCs) are crucial in modern ecosystems, influencing atmospheric processes.
- The role of early life in producing VOCs and their impact on early Earth conditions is largely unknown.
- Previous theories suggest VOCs could explain Archaean geological and evolutionary events.
Purpose of the Study:
- To identify all potential VOCs metabolized by the last universal common ancestor (LUCA).
- To assess the contribution of early biology to non-methane VOC cycling.
- To explore the influence of ancient volatile metabolites on early carbon cycling and atmospheric chemistry.
Main Methods:
- Identified enzyme functions linked to LUCA orthologous protein groups from eight literature sources.
- Estimated the volatility of substrates associated with these enzymes to find ancient volatile metabolites.
- Focused on volatile metabolites with confirmed modern emissions and conserved metabolic pathways.
Main Results:
- Generated a curated list of the most probable VOCs produced by LUCA.
- Identified ancient volatile metabolites with conserved metabolic pathways and modern emissions.
- Provided an assessment of potential VOCs from the last universal common ancestor.
Conclusions:
- Early life likely produced a range of volatile organic metabolites.
- These ancient VOCs may have significantly influenced early Earth's carbon cycling and atmospheric composition.
- This research opens new avenues for understanding the interplay between early biology and planetary environments.
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