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Gene Regulation in Microbial Communities: Quorum Sensing01:28

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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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Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
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[Construct a molecular switch based on bacterial quorum sensing].

Zhiwei Zhang1, Sheng Wu1

  • 1State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China

Sheng Wu Gong Cheng Xue Bao = Chinese Journal of Biotechnology
|January 14, 2014
PubMed
Summary
This summary is machine-generated.

Researchers engineered a molecular switch using bacterial quorum sensing to precisely control enzyme expression in biosynthetic pathways. This system, utilizing homoserine lactone (AHL) and an AHL-degrading enzyme, enables fine-tuned protein production, avoiding inactive inclusion bodies and improving pathway efficiency.

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Area of Science:

  • Synthetic Biology
  • Metabolic Engineering
  • Biotechnology

Background:

  • Engineering biosynthetic pathways requires precise control over enzyme activity and expression levels.
  • Conventional overexpression strategies often lead to inactive inclusion bodies, impairing cellular function.
  • Developing methods for dynamic control of gene expression is crucial for optimizing metabolic pathways.

Purpose of the Study:

  • To design and implement a novel molecular switch for precise, spatiotemporal manipulation of gene expression in engineered biosynthetic pathways.
  • To overcome limitations of conventional overexpression by controlling protein expression levels dynamically.
  • To enable the study of metabolic rhythms and enhance the efficiency of biosynthetic pathways.

Main Methods:

  • Established a cell-cell communication system in E. coli using homoserine lactone (AHL) as a signal molecule.
  • Engineered a synthetic circuit where target gene expression (EGFP) is controlled by an AHL-inducible promoter (P(lux1)).
  • Integrated an AHL-degrading enzyme (AiiA) to dynamically regulate AHL levels and thus control gene transcription.

Main Results:

  • Demonstrated successful spatial and temporal regulation of target gene expression using the designed molecular switch.
  • Verified precise control over the expression level of the target protein EGFP.
  • Showed that the system effectively manages cell growth, mRNA, and protein levels, preventing issues like inclusion body formation.

Conclusions:

  • The developed molecular switch provides a convenient and efficient method for controlling gene expression levels.
  • This system offers significant potential for applications in metabolic engineering and synthetic biology research.
  • The precise control achieved is valuable for studying metabolic pathway dynamics and improving biosynthetic efficiency.