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Related Concept Videos

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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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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Stringent Response in E. coli01:23

Stringent Response in E. coli

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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...
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Other Stress Responses in Bacteria01:30

Other Stress Responses in Bacteria

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Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
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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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Transduction01:16

Transduction

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Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...
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Related Experiment Video

Updated: Feb 24, 2026

Applying an Inducible Expression System to Study Interference of Bacterial Virulence Factors with Intracellular Signaling
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Applying an Inducible Expression System to Study Interference of Bacterial Virulence Factors with Intracellular Signaling

Published on: June 25, 2015

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The Tetracycline Responsive System.

Nasim Yousaf1, David Gould2

  • 1Bone and Joint Research Unit, William Harvey Research Institute, Queen Mary University of London, London, EC1M 6BQ, UK.

Methods in Molecular Biology (Clifton, N.J.)
|August 13, 2017
PubMed
Summary
This summary is machine-generated.

Pharmacologically regulated gene expression offers precise control over protein levels, crucial for both basic research and gene therapy applications. This study details a tetracycline-responsive system for tightly controlled gene expression.

Keywords:
Cell transfectionGene expressionLuciferase assayPharmacologicalTetracycline-inducible systemWestern blotti ng

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Generation of Stable Human Cell Lines with Tetracycline-inducible Tet-on shRNA or cDNA Expression
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Conditional Knockdown of Gene Expression in Cancer Cell Lines to Study the Recruitment of Monocytes/Macrophages to the Tumor Microenvironment
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Generation of Stable Human Cell Lines with Tetracycline-inducible Tet-on shRNA or cDNA Expression
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Area of Science:

  • Molecular Biology
  • Gene Therapy
  • Pharmacology

Background:

  • Constitutive gene expression can lead to detrimental unphysiological protein levels in biological studies.
  • Continuous gene expression may be unnecessary or harmful after therapeutic effects are achieved in gene therapy.

Purpose of the Study:

  • To demonstrate the utility of pharmacologically regulated gene expression systems.
  • To highlight a tightly controlled tetracycline-responsive gene expression system for research and gene therapy.

Main Methods:

  • Utilizing pharmacologically regulated gene expression systems.
  • Implementing a tetracycline-responsive gene expression control system.

Main Results:

  • Achieved fine control over gene expression levels.
  • Facilitated research in basic biology.
  • Enabled applications in experimental gene therapy studies.

Conclusions:

  • Pharmacologically regulated systems provide essential control over gene expression.
  • Tetracycline-responsive systems offer a robust method for tightly controlled gene expression in diverse biological applications.