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Related Concept Videos

Gene Regulation in Microbial Communities: Quorum Sensing01:28

Gene Regulation in Microbial Communities: Quorum Sensing

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Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
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Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
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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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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

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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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Estimating microbial growth is essential for understanding population dynamics and environmental adaptations. Indirect methods provide valuable insights by measuring parameters such as turbidity, metabolic activity, and biomass, enabling efficient and reproducible assessments.During exponential growth, microbial cells scatter light proportionally to their biomass, a principle used in turbidity measurements. About one million cells per milliliter produce detectable scattering, which a...
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Quorum Sensing System Used as a Tool in Metabolic Engineering.

Chang Ge1, Huakang Sheng1, Xin Chen1

  • 1State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, Chaoyang, 100029, China.

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Microbial quorum sensing (QS) coordinates cell behaviors. Engineering QS circuits offers synthetic biology tools for controlling bacterial phenotypes and metabolic pathways, with ongoing challenges and future potential.

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Area of Science:

  • Microbiology
  • Synthetic Biology
  • Metabolic Engineering

Background:

  • Quorum sensing (QS) is a cell-cell communication mechanism coordinating microbial behaviors like biofilm formation and virulence.
  • Engineering QS systems for metabolic regulation is a key strategy in synthetic biology.

Purpose of the Study:

  • To summarize the architecture and genetic components of natural QS systems.
  • To highlight recent advancements in applying QS toolkits for synthetic networks and metabolic engineering.
  • To discuss challenges and future perspectives for QS circuit applications.

Main Methods:

  • Review of natural quorum sensing (QS) mechanisms.
  • Analysis of recent synthetic biology applications of QS circuits.
  • Discussion of challenges and future directions in QS engineering.

Main Results:

  • QS systems coordinate diverse microbial behaviors.
  • Synthetic QS circuits are being developed for programmed control of phenotypes and metabolic pathways.
  • Significant progress has been made in applying QS toolkits for novel applications.

Conclusions:

  • QS engineering holds promise for synthetic biology and metabolic engineering.
  • Challenges remain in large-scale application of QS circuits.
  • Further engineering efforts are needed to fully realize the potential of QS-based synthetic networks.