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Related Concept Videos

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...
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Pathogenic bacteria employ a variety of strategies to establish infections, including the secretion of extracellular enzymes that act as potent virulence factors. These enzymes facilitate bacterial colonization of host tissues and help evade immune surveillance. By targeting structural components of host tissues and interfering with immune mechanisms, these enzymes play a pivotal role in disease progression.Extracellular Enzymes Facilitating Tissue Invasion: Several bacterial pathogens secrete...
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Pathogen colonization of host tissues is a critical step in the development of infectious diseases. Various pathogenic microorganisms, including bacteria, fungi, viruses, and protozoa, have evolved complex strategies to attach to, invade, and persist within host environments. These mechanisms enable pathogens to establish infections, evade immune responses, and resist antimicrobial treatments.Attachment to Host CellsIn bacteria, colonization typically begins with adherence to host epithelial...
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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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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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High-throughput Assay to Phenotype Salmonella enterica Typhimurium Association, Invasion, and Replication in Macrophages
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Salmonella effectors: important players modulating host cell function during infection.

Terence A Agbor1, Beth A McCormick

  • 1Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, MA, USA.

Cellular Microbiology
|September 10, 2011
PubMed
Summary
This summary is machine-generated.

Salmonella Typhimurium uses Type III secretion systems (T3SS) to inject effector proteins into host cells. These effectors manipulate host cell functions, aiding bacterial invasion and survival during infection.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Pathogenesis

Background:

  • Salmonella enterica serovar Typhimurium (S. Typhimurium) is a Gram-negative, food-borne pathogen causing human gastroenteritis.
  • Bacterial virulence relies on sophisticated mechanisms to alter host cell functions.
  • Two Type III secretion systems (T3SS), encoded by SPI-1 and SPI-2, are crucial for S. Typhimurium pathogenesis.

Purpose of the Study:

  • To highlight emerging concepts regarding Salmonella effector proteins in the context of infection.
  • To discuss the role of T3SS in delivering effectors into host cells.
  • To explore how effectors manipulate host cell physiology for bacterial advantage.

Main Methods:

  • The study reviews existing literature and emerging evidence on Salmonella effector proteins.
  • Focuses on the mechanisms of effector secretion and translocation via T3SS.
  • Examines the functional domains and modular nature of effector proteins.

Main Results:

  • Salmonella effectors are translocated into host cells by T3SS to manipulate host physiology.
  • Effectors facilitate bacterial invasion, induce inflammation, and establish intracellular niches for survival.
  • Effectors are modular proteins that activate intracellular signaling pathways.
  • Emerging concepts include dual effector functionality and 'terminal reassortment'.

Conclusions:

  • Salmonella effectors are key virulence factors that subvert host cell functions.
  • Understanding effector mechanisms is critical for combating Salmonella infections.
  • Nascent concepts in effector biology offer new avenues for research.