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Related Concept Videos

Gram-negative Bacterial Protein Secretion Systems01:17

Gram-negative Bacterial Protein Secretion Systems

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Gram-negative bacteria utilize sophisticated protein secretion systems to transport proteins across their double-membrane envelope into the extracellular environment or host cells. Based on their mechanism of action, these systems are classified into one-step and two-step pathways.One-Step Secretion Systems (Types I, III, IV, and VI)One-step secretion systems bypass the periplasm entirely, forming a continuous channel that spans both the inner and outer membranes:Type I Secretion System (T1SS):...
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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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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 Phylum Proteobacteria01:26

Bacterial Phylum Proteobacteria

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Proteobacteria, one of the largest and most diverse bacterial phyla, encompasses a wide range of Gram-negative bacteria distinguished by their outer membrane composed of lipopolysaccharides. These microorganisms exhibit various metabolic capabilities, including phototrophy, chemolithotrophy, and heterotrophy, and thrive in diverse environments from soil to aquatic systems and host-associated niches. The phylum is divided into six classes: Alphaproteobacteria, Betaproteobacteria,...
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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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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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Secretion Systems in Gram-Negative Bacterial Fish Pathogens.

Sophanit Mekasha1, Dirk Linke1

  • 1Section for Genetics and Evolutionary Biology, Department of Biosciences, University of Oslo, Oslo, Norway.

Frontiers in Microbiology
|January 3, 2022
PubMed
Summary
This summary is machine-generated.

Bacterial fish pathogens use diverse secretion systems to deliver virulence factors, crucial for infection. This review details these systems in Gram-negative fish pathogens to aid research.

Keywords:
Gram-negativeaquaculturefish diseasefish pathogensecretion systemvirulence factor

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Area of Science:

  • Aquatic microbiology
  • Bacterial pathogenesis
  • Aquaculture science

Background:

  • Bacterial fish pathogens pose significant challenges to the global aquaculture industry.
  • Virulence factors like toxins and enzymes are essential for pathogen colonization and infection.
  • Secretion systems are critical for translocating these virulence factors into host cells or the environment.

Purpose of the Study:

  • To review and describe the various secretion systems in Gram-negative bacterial fish pathogens.
  • To elucidate the putative roles of these secretion systems in pathogenicity.
  • To provide a consolidated overview to help researchers understand similarities and differences.

Main Methods:

  • Literature review of scientific publications on bacterial fish pathogens.
  • Analysis of known virulence factors and their corresponding secretion systems.
  • Comparative description of secretion system types and functions.

Main Results:

  • Identified diverse secretion systems, ranging from simple to complex, employed by Gram-negative fish pathogens.
  • Detailed the specific roles of these systems in delivering virulence factors.
  • Highlighted fragmentation and descriptive nature of current information.

Conclusions:

  • Secretion systems are key determinants of pathogenicity in bacterial fish pathogens.
  • A systematic understanding of these systems is needed to combat aquaculture challenges.
  • This review serves as a foundational resource for future research in the field.