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Related Concept Videos

Gram-negative Bacterial Protein Secretion Systems01:17

Gram-negative Bacterial Protein Secretion Systems

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):...
Bacterial Translocation and Protein Secretion01:26

Bacterial Translocation and Protein Secretion

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...
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...
Mechanism of Conjugation01:19

Mechanism of Conjugation

Bacterial conjugation is a mechanism of horizontal gene transfer that enables the exchange of genetic material between bacterial cells through direct contact. This process is facilitated by a donor cell carrying a conjugative plasmid, which encodes genes necessary for pilus formation, DNA replication, and transfer. The conjugative plasmid plays a central role in initiating and executing the transfer of genetic material.The tra region of the conjugative plasmid encodes proteins responsible for...
CRISPR and crRNAs02:53

CRISPR and crRNAs

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Overview of Secretory Vesicles

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Related Experiment Video

Updated: May 12, 2026

A Visual Assay to Monitor T6SS-mediated Bacterial Competition
08:45

A Visual Assay to Monitor T6SS-mediated Bacterial Competition

Published on: March 20, 2013

The Type VI secretion system - a widespread and versatile cell targeting system.

Sarah J Coulthurst1

  • 1Department of Molecular Microbiology, College of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, UK. s.j.coulthurst@dundee.ac.uk

Research in Microbiology
|April 2, 2013
PubMed
Summary

The Type VI secretion system (T6SS) is a bacterial weapon used to target competitor cells or eukaryotes. This system injects toxins, playing roles in virulence and inter-bacterial competition.

Keywords:
Bacterial competitionBacterial protein secretionSecreted effectorType VI secretionVirulence

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Last Updated: May 12, 2026

A Visual Assay to Monitor T6SS-mediated Bacterial Competition
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Conjugative Mating Assays for Sequence-specific Analysis of Transfer Proteins Involved in Bacterial Conjugation
10:41

Conjugative Mating Assays for Sequence-specific Analysis of Transfer Proteins Involved in Bacterial Conjugation

Published on: January 4, 2017

Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Pathogenesis

Background:

  • The Type VI secretion system (T6SS) is a recently identified secretion mechanism in Gram-negative bacteria.
  • It is widely distributed across diverse bacterial species.
  • T6SSs are complex molecular machines resembling bacteriophage structures, capable of puncturing target cells.

Purpose of the Study:

  • To summarize the known functions and implications of T6SS in bacterial interactions.
  • To highlight the dual role of TSS in targeting eukaryotic cells and competing with other bacteria.
  • To identify areas requiring further investigation regarding T6SS mechanisms and applications.

Main Methods:

  • Literature review of existing studies on T6SS.
  • Analysis of T6SS involvement in virulence and inter-bacterial competition.
  • Comparative analysis of TSS structures and functions across different bacterial species.

Main Results:

  • T6SSs are implicated in targeting eukaryotic cells and contributing to virulence in pathogens.
  • Specialized 'antibacterial' T6SSs have been identified, delivering toxins to eliminate competitor bacteria.
  • T6SSs function as versatile weapons in bacterial warfare and host interactions.

Conclusions:

  • T6SSs are crucial for bacterial competition and pathogenesis.
  • Further research is needed to fully elucidate the complex mechanisms and diverse roles of T6SS.
  • Understanding T6SS offers potential for novel therapeutic strategies against bacterial infections.