Related Experiment Videos
Life without dihydrofolate reductase FolA
Hannu Myllykallio1, Damien Leduc, Jonathan Filee
1Institut de Génétique et Microbiologie CNRS UMR8621, Université de Paris-Sud, Orsay, France. hannu.myllykallio@igmors.u-psud.fr
Trends in Microbiology
|June 5, 2003
Summary
Many bacteria lack the essential dihydrofolate reductase (FolA) enzyme. These bacteria utilize novel flavin-dependent thymidylate synthases, suggesting undiscovered sources for vital reduced folate molecules.
Area of Science:
- Bacterial metabolism
- Enzymology
- Comparative genomics
Background:
- Reduced folate derivatives are crucial for bacterial intermediary metabolism.
- Dihydrofolate reductase (FolA) is traditionally considered essential for bacterial growth due to its role in tetrahydrofolate formation.
- Comparative genomics revealed bacterial species lacking the folA gene, challenging this assumption.
Purpose of the Study:
- To investigate the metabolic pathways in bacteria that lack the folA gene.
- To identify alternative mechanisms for deoxythymidine-5'-monophosphate synthesis in these bacteria.
- To propose the existence of uncharacterized reduced folate sources in bacteria.
Main Methods:
- In silico analysis of bacterial genomes.
- Comparative genomics.
- Bioinformatic approaches to identify enzymatic pathways.
Main Results:
- Evidence suggests folA-lacking bacteria employ a distinct class of flavin-dependent thymidylate synthases.
- This alternative pathway facilitates deoxythymidine-5'-monophosphate synthesis.
- The study highlights a gap in understanding folate metabolism in certain bacterial lineages.
Conclusions:
- Bacteria can survive and synthesize essential compounds without the canonical dihydrofolate reductase (FolA).
- Flavin-dependent thymidylate synthases represent a key alternative pathway in these organisms.
- Further research is needed to uncover novel reduced folate sources in bacteria.