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Related Concept Videos

Determinants of Bacterial Pathogenicity and Virulence01:20

Determinants of Bacterial Pathogenicity and Virulence

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...
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...
Colonisation of Pathogens01:25

Colonisation of Pathogens

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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Related Experiment Video

Updated: May 28, 2026

Microscopy-based Assays for High-throughput Screening of Host Factors Involved in Brucella Infection of Hela Cells
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Published on: August 5, 2016

Exploring the Link Between Biotin Metabolism and Brucella Virulence: A Study on BioA.

Donghui Liu1,2, Heng Quan2, Mengyao Liu2

  • 1College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China.

Pathogens (Basel, Switzerland)
|May 27, 2026
PubMed
Summary

Brucella abortus BioA enzyme is crucial for virulence. Its deficiency impairs bacterial structural integrity and reduces pathogenicity, making BioA a potential target for treating brucellosis.

Keywords:
BioABrucella abortusbiotin metabolismtype IV secretion systemvirulence

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Last Updated: May 28, 2026

Microscopy-based Assays for High-throughput Screening of Host Factors Involved in Brucella Infection of Hela Cells
15:29

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Published on: January 27, 2015

Area of Science:

  • Microbiology
  • Pathogenesis
  • Bacterial Metabolism

Background:

  • Brucella requires biotin for survival.
  • The role of BioA, a biotin synthesis enzyme, in Brucella virulence is unknown.

Purpose of the Study:

  • Investigate the contribution of BioA to Brucella abortus pathogenicity.
  • Determine if BioA is a potential target for anti-brucellosis interventions.

Main Methods:

  • Constructed a ΔBioA mutant in Brucella abortus 104M.
  • Phenotypic characterization using growth assays, electron microscopy, macrophage infection models, and murine splenic colonization.
  • Quantified virulence gene expression using RT-qPCR.

Main Results:

  • ΔBioA mutant showed biotin auxotrophy and damaged outer membrane.
  • Intracellular survival in macrophages decreased by 95%.
  • Mice infected with the mutant had reduced splenic bacterial loads, spleen weight, and downregulated VirB T4SS genes.

Conclusions:

  • BioA links biotin metabolism to Brucella virulence.
  • BioA deficiency attenuates pathogenicity by impairing structural integrity and VirB operon transcription.
  • BioA is a promising novel target for anti-brucellosis interventions.