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Related Concept Videos

Global Regulatory Systems01:28

Global Regulatory Systems

413
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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Constitutive and Regulated Gene Expression01:27

Constitutive and Regulated Gene Expression

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Gene expression in prokaryotes is governed by constitutive and regulated systems, allowing cells to balance the production of essential proteins with adaptive responses to environmental changes.Constitutive Gene ExpressionConstitutive, or housekeeping, genes are continuously expressed as they encode proteins vital for fundamental cellular processes. These include enzymes for glycolysis, ribosomal components for protein synthesis, and proteins involved in DNA replication. Their constant...
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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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Operon Model01:23

Operon Model

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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...
819
Other Stress Responses in Bacteria01:30

Other Stress Responses in Bacteria

248
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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Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays
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Engineering regulatory networks for complex phenotypes in E. coli.

Rongming Liu1, Liya Liang1, Emily F Freed1

  • 1Renewable and Sustainable Energy Institute (RASEI), University of Colorado Boulder, Boulder, Colorado, USA.

Nature Communications
|August 15, 2020
PubMed
Summary
This summary is machine-generated.

Researchers engineered a large library of genetic mutations to understand cellular metabolism. This library effectively identifies improved microbial strains for industrial applications like enhanced compound production and inhibitor resistance.

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Area of Science:

  • Systems biology
  • Metabolic engineering
  • Microbial genetics

Background:

  • Cellular metabolism is regulated by complex networks of transcription factors and genes.
  • Understanding these regulatory networks is crucial for engineering microbial strains with desired traits.

Purpose of the Study:

  • To design, construct, and map a comprehensive regulatory network library for microbial engineering.
  • To screen this library for mutants exhibiting enhanced metabolic phenotypes, such as inhibitor resistance and improved compound production.

Main Methods:

  • Creation of a library with 110,120 specific mutations in 82 regulators.
  • Screening the library for targeted phenotypes including resistance to inhibitors and enhanced production of specific compounds.

Main Results:

  • Identification of mutants with significant improvements in targeted phenotypes within a single selection round.
  • Demonstration of the library's universal applicability, convenience, and effectiveness for phenotype engineering.

Conclusions:

  • The developed regulatory network library is a powerful tool for understanding global regulation and engineering microbial strains.
  • This approach facilitates advancements in synthetic biology, strain development, and applications in less-understood organisms.