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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):...
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A Visual Assay to Monitor T6SS-mediated Bacterial Competition
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Published on: March 20, 2013

The expanding bacterial type IV secretion lexicon.

Minny Bhatty1, Jenny A Laverde Gomez, Peter J Christie

  • 1Department of Microbiology and Molecular Genetics, University of Texas Medical School at Houston, 6431 Fannin, Houston, TX 77030, USA.

Research in Microbiology
|April 2, 2013
PubMed
Summary

Bacterial type IV secretion systems (T4SSs) move DNA or proteins between cells. This review explores T4SS diversity, evolution, and structure, including

Keywords:
ATPaseConjugationPathogenesisPilusTranslocationType IV secretion

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Structural Biology

Background:

  • Bacterial type IV secretion systems (T4SSs) are crucial for transferring DNA or proteins between cells, often requiring direct contact.
  • T4SSs are broadly classified into conjugation systems (disseminating resistance/virulence) and effector translocators (pathogen virulence).
  • Understanding T4SS diversity is vital for combating bacterial pathogens and antibiotic resistance.

Purpose of the Study:

  • To summarize the structural and functional diversity of bacterial type IV secretion systems (T4SSs).
  • To explore the evolutionary processes that have shaped T4SS diversity.
  • To compare T4SS mechanisms and architectures across different bacterial species.

Main Methods:

  • Review and synthesis of existing literature on bacterial type IV secretion systems.
  • Comparative analysis of structural and functional data from Gram-negative and Gram-positive bacteria.
  • Introduction of the 'minimized' T4SS concept based on conserved subunits.

Main Results:

  • T4SSs exhibit significant structural and functional diversity, with distinct subfamilies.
  • Conjugation T4SSs facilitate the spread of antibiotic resistance and virulence factors.
  • Effector translocator T4SSs deliver virulence proteins into eukaryotic host cells.
  • Minimized T4SSs, comprising 5-6 conserved subunits, are found in various bacterial species.

Conclusions:

  • Bacterial type IV secretion systems (T4SSs) are diverse and play critical roles in bacterial biology and pathogenesis.
  • Comparative analysis reveals conserved and divergent features across T4SS families and bacterial types.
  • The identification of minimized T4SSs offers insights into their evolutionary origins and potential functions.