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Evolutionary consideration on 5-aminolevulinate synthase in nature
1Research Institute of Evolutionary Biology, Tokyo, Japan.
Summary
5-Aminolevulinic acid (ALA) is synthesized via two pathways. ALA synthase, found in purple bacteria and eukaryotic mitochondria, likely evolved from a common ancestor, with its evolution linked to bacterial energy systems.
Area of Science:
- Biochemistry and Molecular Biology
- Evolutionary Biology
- Microbiology
Background:
- 5-Aminolevulinic acid (ALA) is a crucial precursor for tetrapyrrole compounds.
- ALA can be synthesized through the C5 (glutamate) pathway or via ALA synthase.
- Understanding the evolutionary origins of ALA synthesis is key to comprehending cellular metabolism.
Purpose of the Study:
- To investigate the phylogenetic distribution of ALA synthase.
- To determine the evolutionary origin of ALA synthase in eukaryotes and prokaryotes.
- To explore the relationship between ALA synthase evolution and bacterial metabolic strategies.
Main Methods:
- Phylogenetic analysis of ALA synthase distribution across different organisms.
- Sequence analysis of the ALA synthase enzyme.
- Comparative analysis of bacterial energy-generating and biosynthetic pathways.
Main Results:
- ALA synthase distribution is primarily restricted to the alpha subclass of purple bacteria in prokaryotes.
- ALA synthase is also found in the mitochondria of eukaryotes.
- Sequence analysis supports a monophyletic origin for bacterial and eukaryotic ALA synthase.
- Evolution of ALA synthase correlates with specific metabolic features within purple bacteria subclasses.
Conclusions:
- The study provides evidence for a shared evolutionary history of ALA synthase in bacteria and eukaryotes.
- The findings suggest that ALA synthase evolution is intertwined with the development of energy metabolism in bacteria.
- This research sheds light on the ancient origins of essential metabolic pathways.