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Related Concept Videos

Riboswitches01:56

Riboswitches

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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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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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Transcriptional Regulation: Riboswitches01:23

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Riboswitches are RNA elements that regulate gene expression by altering their secondary structures in response to specific effector molecules. These elements, located in the leader regions of certain mRNAs, act as transcriptional regulators by toggling between alternative conformations to control downstream gene expression. Riboswitch-mediated regulation is a precise mechanism for modulating biosynthetic pathways, as exemplified by the riboflavin biosynthesis pathway in Bacillus...
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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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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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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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Rapid Synthesis and Screening of Chemically Activated Transcription Factors with GFP-based Reporters
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Robust network topologies for temperature-inducible bioswitches.

Di Wu1, Hongli Wang2,3, Qi Ouyang1,4,5

  • 1The State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University, Beijing, 100871, China.

Journal of Biological Engineering
|May 23, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces topology-based thermal bioswitches, moving beyond molecule-based designs. Network topologies are identified as key to creating efficient and robust temperature-inducible genetic switches.

Keywords:
Genetic circuitsNetwork motifThermoinducible bioswitch

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Area of Science:

  • Synthetic Biology
  • Systems Biology
  • Biochemical Engineering

Background:

  • Thermoinducible bioswitches respond to temperature, a global factor affecting biochemical processes.
  • Existing temperature-inducible bioswitches rely on temperature-sensitive biomolecules like DNA, RNA, proteins, and lipids.

Purpose of the Study:

  • To explore network topologies for achieving thermal switching functions.
  • To identify minimal network skeletons for robust bioswitch design.
  • To extend traditional molecule-based thermal switches to topology-based approaches.

Main Methods:

  • Investigated three-node genetic interaction networks.
  • Utilized the Arrhenius law for biochemical reactions.
  • Screened network topologies for thermal bioswitch capabilities (Off-On, On-Off, Off-On-Off).

Main Results:

  • Identified essential network skeletons for Off-On, On-Off, and Off-On-Off thermal bioswitches.
  • Demonstrated that functional topologies implicitly favor specific parameter values.
  • Proposed topology-based bioswitches as an extension to molecule-based designs.

Conclusions:

  • Minimal network topologies are fundamental for high-performance bioswitches.
  • Topology-based bioswitch design offers a new paradigm for engineering temperature-responsive genetic systems.
  • This approach aids in the rational design and synthesis of efficient thermal bioswitches.