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A single transcription factor regulates evolutionarily diverse but functionally linked metabolic pathways in response
Amy K Schmid1, David J Reiss, Min Pan
1Institute for Systems Biology, Seattle, WA 98103-8904, USA.
Molecular Systems Biology
|June 19, 2009
Summary
A single transcription factor, TrmB, in Halobacterium salinarum coordinates diverse metabolic pathways and enzyme expression in response to nutrient availability. This reveals a global regulatory mechanism for metabolic adaptation and gene co-evolution.
Area of Science:
- Microbial metabolism
- Gene regulation
- Evolutionary biology
Background:
- Metabolic pathways are crucial for organismal adaptation to environmental changes.
- Gene regulatory networks fine-tune metabolic fluxes.
- Lateral gene transfer contributes to metabolic pathway evolution.
Purpose of the Study:
- To investigate the role of the TrmB transcription factor in coordinating metabolic pathways in Halobacterium salinarum.
- To understand how gene regulatory networks adapt to nutrient fluctuations.
- To explore the co-evolution of metabolic and regulatory networks.
Main Methods:
- Analysis of gene regulatory networks.
- Identification of TrmB binding sites.
- Examination of promoter activity for 113 genes.
- Comparative genomics of enzyme-coding genes.
Main Results:
- TrmB globally coordinates 113 promoters in response to carbon source availability.
- TrmB regulates glycolysis, TCA cycle, and amino-acid biosynthesis pathways, including cofactor biosynthesis.
- The TrmB-regulated network encompasses archaeal-specific and universally conserved genes.
Conclusions:
- TrmB acts as a global regulator integrating expression of diverse metabolic genes.
- This coordination facilitates adaptation to nutrient fluctuations.
- The findings suggest ongoing co-evolution of metabolic and gene regulatory networks.
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