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Operons

Operons

Prokaryotes can control gene expression through operons—DNA sequences consisting of regulatory elements and clustered, functionally related protein-coding genes. Operons use a single promoter sequence to initiate transcription of a gene cluster (i.e., a group of structural genes) into a single mRNA molecule. The terminator sequence ends transcription. An operator sequence, located between the promoter and structural genes, prohibits the operon’s transcriptional activity if bound by a repressor...

Prokaryotic Transcriptional Activators and Repressors

Prokaryotic Transcriptional Activators and Repressors

The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...

Operons

Operons

Prokaryotes can control gene expression through operons—DNA sequences consisting of regulatory elements and clustered, functionally related protein-coding genes. Operons use a single promoter sequence to initiate transcription of a gene cluster (i.e., a group of structural genes) into a single mRNA molecule. The terminator sequence ends transcription. An operator sequence, located between the promoter and structural genes, prohibits the operon’s transcriptional activity if bound by a repressor...

Prokaryotic Transcriptional Activators and Repressors

Prokaryotic Transcriptional Activators and Repressors

The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...

Operon Model

Operon 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...

Inducible Operons: lac Operon

Inducible 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...

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Related Experiment Video

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Introduction to Solid Supported Membrane Based Electrophysiology

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Origin of bistability in the lac Operon.

M Santillán¹, M C Mackey, E S Zeron

¹Unidad Monterrey, Centro de Investigación y Estudios Avanzados del Instituto Politécnico Nacional, Monterrey, México. moises.santillan@mac.com

Biophysical Journal

|March 14, 2007

Summary

Bistability in the lac operon ensures efficient glucose and lactose consumption by Escherichia coli. This emergent property guarantees induction only when glucose is scarce, optimizing nutrient utilization.

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Area of Science:

Systems Biology
Molecular Biology
Biophysics

Background:

Multistability explains coexisting biological states.
The lac operon exhibits bistability, crucial for gene regulation.

Purpose of the Study:

Investigate the origin of lac operon bistability.
Analyze the role of lactose metabolism in this bistability.
Understand Escherichia coli's nutrient consumption efficiency.

Main Methods:

Developed a mathematical model for the lac operon regulatory pathway.
Compared model predictions with experimental data using a nonmetabolizable inducer.
Performed stochastic numerical simulations.

Main Results:

Lactose metabolism significantly alters the bistable region in external lactose (Le) and glucose (Ge) parameter space.
Model predicts bistability can disappear for very low Ge.
Bistability ensures the lac operon is induced only when glucose is nearly absent.

Conclusions:

Bistability optimizes Escherichia coli's glucose and lactose consumption strategy.
This emergent property preserves the stability of induced and uninduced states.
Methods and findings are applicable to studying multistability in other biological systems.