Related Experiment Video
Updated: Aug 15, 2026
08:03
A Tandem Liquid Chromatography–Mass Spectrometry-based Approach for Metabolite Analysis of Staphylococcus aureus
Published on: March 28, 2017
A quantitative approach to catabolite repression in Escherichia coli
Katja Bettenbrock1, Sophia Fischer, Andreas Kremling
1Systems Biology Group, Max-Planck-Institut für Dynamik komplexer technischer Systeme, 39106 Magdeburg, Germany. bettenbrock@mpi-magdeburg.mpg.de
The Journal of Biological Chemistry
|November 3, 2005
Summary
This study developed a dynamic mathematical model to quantitatively explain catabolite repression in Escherichia coli, detailing carbohydrate uptake and regulation mechanisms.
Area of Science:
- Microbiology
- Systems Biology
- Biochemistry
Background:
- Catabolite repression is a key regulatory mechanism in bacteria like Escherichia coli.
- Understanding carbohydrate metabolism and its regulation is crucial for microbial physiology.
Purpose of the Study:
- To develop a dynamic mathematical model for carbohydrate uptake in Escherichia coli.
- To quantitatively describe catabolite repression and related signal transduction processes.
Main Methods:
- Developed a dynamic mathematical model incorporating metabolic reactions and signal transduction.
- Utilized isogenic strains with defined mutations for model validation.
- Measured time courses of intracellular and extracellular components under various growth conditions.
Main Results:
- The model quantitatively describes catabolite repression in E. coli.
- Model predictions were verified using experimental data from nine different strains.
- The model encompasses 17 key enzymes, 38 reactions, and over 50 metabolites.
Conclusions:
- The developed model successfully explains phenomena affecting EIIACrr phosphorylation, a key regulator.
- This provides a quantitative understanding of inducer exclusion and catabolite repression in enteric bacteria.
Related Concept Videos
01:25Inducible Operons: lac Operon
The lac operon in Escherichia coli is a model for understanding inducible gene regulation and metabolic flexibility. It integrates local control by lactose and global regulation through catabolite repression, enabling E. coli to preferentially metabolize glucose when available and switch to lactose utilization when glucose is scarce.Structure and Function of the lac OperonThe lac operon contains three structural genes: lacZ (β-galactosidase), lacY (lactose permease), and lacA (thiogalactoside...
01:23Stringent Response in E. coli
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
01:21Repressible Operon: trp Operon
The trp operon in Escherichia coli exemplifies a repressible operon. It regulates the synthesis of tryptophan through repressor-mediated transcriptional control and attenuation. This dual regulatory mechanism ensures tryptophan biosynthesis occurs only when needed, conserving cellular resources.Structure of the trp OperonThe trp operon consists of five structural genes (trpE, trpD, trpC, trpB, and trpA) that encode enzymes for tryptophan biosynthesis. These genes are transcribed as a single...
01:23Operon Model
The operon model represents a fundamental mechanism of gene regulation in prokaryotes, enabling coordinated expression of genes involved in related metabolic or functional pathways. Operons consist of structural genes, a promoter, and an operator, with transcription regulated by repressors, activators, and small effector molecules.Structure and Function of OperonsAn operon is a cluster of structural genes transcribed together under the control of a single promoter. The promoter region...