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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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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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Gene Regulation in Microbial Communities: Quorum Sensing

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,...
Regulation of Bacterial Virulence01:28

Regulation of Bacterial Virulence

Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...
Other Stress Responses in Bacteria01:30

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DNA-affinity-purified Chip (DAP-chip) Method to Determine Gene Targets for Bacterial Two component Regulatory Systems
12:24

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Published on: July 21, 2014

Signal integration in bacterial two-component regulatory systems.

Alexander Y Mitrophanov1, Eduardo A Groisman

  • 1Department of Molecular Microbiology, Howard Hughes Medical Institute, Washington University School of Medicine, St. Louis, Missouri 63110, USA.

Genes & Development
|October 4, 2008
PubMed
Summary

Two-component systems (TCSs) are regulated by TCS connectors, a new protein class that fine-tunes bacterial signal transduction. These connectors impact crucial cellular processes like antibiotic resistance and growth.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Physiology

Background:

  • Two-component systems (TCSs) and phosphorelays are central to bacterial signal transduction pathways.
  • Response regulators within TCSs become phosphorylated to execute functions like DNA binding and catalysis.
  • TCSs regulate diverse bacterial physiological processes.

Purpose of the Study:

  • To introduce and describe the emerging class of TCS connectors.
  • To elucidate the mechanisms by which TCS connectors modulate TCS output.
  • To highlight the physiological significance of TCS connectors in bacteria.

Main Methods:

  • The study focuses on the functional characterization of TCS connectors.
  • Mechanisms of action for signal integration and cellular process coordination are discussed.
  • Comparative analysis across Gram-positive and Gram-negative bacteria is implied.

Main Results:

  • TCS connectors are identified as critical modulators of response regulator phosphorylation.
  • These connectors employ diverse mechanisms for signal integration and fine-tuning cellular processes.
  • TCS connectors are conserved across bacterial species.

Conclusions:

  • TCS connectors represent a novel regulatory layer in bacterial signal transduction.
  • They play vital roles in essential bacterial functions, including sporulation, competence, antibiotic resistance, and stationary phase transition.
  • Understanding TCS connectors offers new insights into bacterial physiology and potential therapeutic targets.