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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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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...
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Formation of Lipopolysaccharides

Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin, triggering...
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Viral Replication: Lytic Cycle

Bacteriophages, or phages, are viruses that specifically infect bacteria. Among them, T-even bacteriophages, such as T4, exhibit a well-characterized lytic replication cycle in Escherichia coli (E. coli). This process ensures the rapid proliferation of the virus while ultimately leading to the destruction of the bacterial host.Attachment and DNA InjectionThe infection process begins with the recognition and binding of the T4 phage to the E. coli cell surface. Tail fibers of the phage...
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Applying Live Cell Imaging and Cryo-Electron Tomography to Resolve Spatiotemporal Features of the Legionella pneumophila Dot/Icm Secretion System
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Applying Live Cell Imaging and Cryo-Electron Tomography to Resolve Spatiotemporal Features of the Legionella pneumophila Dot/Icm Secretion System

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A lysis less ordinary: The bacterial Type 10 Secretion System.

Mechna Chowdhury1, Phillip J Stansfeld2, Frank Sargent1

  • 1Faculty of Medical Sciences, Newcastle University Biosciences Institute, Newcastle University, Newcastle upon Tyne.

Advances in Microbial Physiology
|May 22, 2025
PubMed
Summary

Bacteria use Type 10 Secretion Systems (T10SS) to move proteins out of cells. This review explores T10SS mechanisms in various bacteria, including controlled release and cell lysis.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Physiology

Background:

  • Bacteria employ diverse protein secretion systems for extracellular protein export.
  • Many systems share evolutionary origins with bacteriophage machinery.
  • The Type 10 Secretion System (T10SS) is linked to phage lysis cassettes.

Purpose of the Study:

  • To review recent research on the Type 10 Secretion System (T10SS).
  • To explore the mechanisms and evolutionary links of T10SS in various bacterial species.
  • To discuss evidence for different T10SS functional models.

Main Methods:

  • Literature review of recent research on T10SS.
  • Comparative analysis of T10SS gene sequences and functions.
  • Examination of T10SS components, including holin-like proteins and peptidoglycan hydrolases.

Main Results:

  • T10SS minimum components are a holin-like protein and a peptidoglycan hydrolase.
  • T10SS genes show similarities to phage lysis cassettes.
  • Evidence supports T10SS mechanisms from controlled protein release to stochastic cell lysis.

Conclusions:

  • T10SS represents a distinct bacterial protein secretion pathway with phage-like elements.
  • The system's function varies, potentially involving regulated protein export or population-level lysis.
  • Further research is needed to fully elucidate T10SS diversity and function across bacterial species.