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Related Concept Videos

Global Regulatory Systems01:28

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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Bacterial Signaling01:30

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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 Sensing01:28

Gene Regulation in Microbial Communities: Quorum Sensing

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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 Translocation and Protein Secretion01:26

Bacterial Translocation and Protein Secretion

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Bacterial protein secretion involves translocation systems to ensure proteins reach their designated locations, including the plasma membrane, periplasm, outer membrane, or the external environment. These translocation systems are vital for bacterial physiology, supporting processes like membrane assembly, enzymatic activity in the periplasm, and interactions with the external environment. The division of labor between Sec and Tat pathways ensures efficiency in handling proteins with diverse...
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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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Intracellular Signaling Cascades01:24

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Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...
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Related Experiment Video

Updated: Aug 1, 2025

Studying Copper Nanoparticle-Induced Programmed Cell Death in Bacteria
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Linking Copper-Associated Signal Transduction Systems with Their Environment in Marine Bacteria.

Pratima Gautam1, Ivan Erill1, Kathleen D Cusick1

  • 1Department of Biological Sciences, University of Maryland Baltimore County, Baltimore, MD 21250, USA.

Microorganisms
|April 28, 2023
PubMed
Summary

Marine bacteria possess sophisticated systems to manage copper, an essential but potentially toxic element. Environmental factors like sediment and biofilm influence the diversity and abundance of these copper-sensing and response mechanisms.

Keywords:
comparative genomicscopperenvironmentmarine bacteriasignal transduction system

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Area of Science:

  • Microbiology
  • Environmental Science
  • Genomics

Background:

  • Copper is vital for cellular function but toxic at high concentrations.
  • Marine bacteria face fluctuating copper levels due to environmental factors and human activities.
  • Effective copper homeostasis is crucial for marine bacterial survival.

Purpose of the Study:

  • To review copper-associated signal transduction systems in marine bacteria.
  • To conduct a comparative genomics study on these systems across different marine environments.
  • To investigate the influence of environment on copper regulatory systems.

Main Methods:

  • Literature review of copper efflux, detoxification, and chaperone systems.
  • Comparative genomics analysis of marine bacteria.
  • Analysis of species from seawater, sediment, biofilm, and marine pathogens.

Main Results:

  • Numerous homologs of copper-associated signal transduction systems were identified in marine bacteria.
  • Environmental factors, particularly sediment and biofilm, showed increased system homologs compared to seawater.
  • Variability in the alternate sigma factor CorE was observed, with lower abundance in seawater and pathogen species.

Conclusions:

  • Marine bacterial copper regulatory systems are diverse and influenced by both phylogeny and environment.
  • Sediment and biofilm environments may exert stronger selective pressures on copper homeostasis mechanisms.
  • The alternate sigma factor CorE shows distinct distribution patterns across different marine niches.