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Related Concept Videos

Global Regulatory Systems01:28

Global Regulatory Systems

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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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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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...
Coordination of Gene Expression Processes in Bacteria01:29

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The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...
Repressible Operon: trp Operon01:21

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Live Cell Fluorescence Microscopy to Observe Essential Processes During Microbial Cell Growth
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Published on: November 24, 2017

Positively regulated bacterial expression systems.

Trygve Brautaset1, Rahmi Lale, Svein Valla

  • 1Department of Biotechnology, Sintef Materials and Chemistry, Sintef, Trondheim, Norway. trygve.brautaset@sintef.no

Microbial Biotechnology
|January 26, 2011
PubMed
Summary
This summary is machine-generated.

This review explores bacterial promoter systems for controlling gene expression, focusing on the versatile AraC-XylS family. These systems offer tunable gene expression for biotechnology and metabolic engineering applications.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biotechnology

Background:

  • Regulated promoters are essential for controlling recombinant gene expression in bacteria.
  • Inducible promoters, regulated by positive or negative regulators, are commonly used for high-level or physiological gene expression.

Purpose of the Study:

  • To review established and potential positively regulated bacterial promoter systems.
  • To emphasize promoter systems controlled by the AraC-XylS family of transcriptional activators.

Main Methods:

  • Review of existing literature on bacterial promoter systems.
  • Bioinformatics analysis of the AraC-XylS family of regulators.

Main Results:

  • Positively regulated promoter systems function across diverse microorganisms like enterobacteria, soil bacteria, lactic acid bacteria, and streptomycetes.
  • A wide array of inducers are used, including sugars, substituted benzenes, and peptides, with varying requirements for transport systems and host metabolism.
  • Only a small subset of the >300 identified AraC-XylS family members have been explored for biotechnological applications.

Conclusions:

  • The AraC-XylS family of regulators offers a rich source of diverse promoter systems for bacterial gene expression.
  • Further exploration of these regulators and their corresponding promoters holds significant potential for advancing metabolic engineering and recombinant protein production.