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Related Concept Videos

Operon Model01:23

Operon Model

604
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...
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Inducible Operons: lac Operon01:25

Inducible Operons: lac Operon

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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...
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Operons02:09

Operons

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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...
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Repressible Operon: trp Operon01:21

Repressible Operon: trp Operon

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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...
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Prokaryotic Transcriptional Activators and Repressors01:58

Prokaryotic Transcriptional Activators and Repressors

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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...
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Global Regulatory Systems01:28

Global Regulatory Systems

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Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
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Manipulating microcompartment operons to study mechanism and function.

James W Wilson1

  • 1Department of Biology, Mendel Hall, Villanova University, 800 Lancaster Avenue, Villanova, PA 19085, USA.

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Bacterial microcompartment (BMC) gene systems are modular and can be engineered. Researchers are transferring and expressing BMC genes across species using advanced DNA techniques for novel applications.

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Area of Science:

  • Molecular Biology
  • Synthetic Biology
  • Microbiology

Background:

  • Bacterial microcompartments (BMCs) are protein-based organelles encoded by gene systems typically containing 10-23 genes in an operon.
  • BMC gene systems exhibit a flexible, modular nature, allowing for their study as whole operons or functional subsets.

Purpose of the Study:

  • To investigate the modularity and transferability of bacterial microcompartment (BMC) gene systems.
  • To explore the functional expression of BMC operons/genes across different bacterial species.

Main Methods:

  • Utilized recombineering, DNA synthesis technology, and advanced cloning techniques.
  • Applied genetic manipulation at the DNA level to study BMC gene function and mechanism.

Main Results:

  • Demonstrated the flexible and modular nature of BMC operons and genes.
  • Successfully transferred and achieved functional expression of BMC operons/genes across bacterial species.

Conclusions:

  • BMC gene systems offer versatile platforms for synthetic biology applications due to their modularity.
  • Genetic engineering approaches enable the harnessing and interspecies transfer of BMC functions.