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Related Concept Videos

Gram-negative Bacterial Protein Secretion Systems01:17

Gram-negative Bacterial Protein Secretion Systems

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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 Secretion01:26

Bacterial Translocation and Protein Secretion

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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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Insertion of Single-pass Transmembrane Proteins in the RER01:26

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Integral membrane proteins are proteins adhered to the lipid bilayer of a cell organelle or membrane. They can be of two types: transmembrane integral proteins that span the lipid bilayer and monotopic proteins that are attached to either side of the membrane but do not pass through it.
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Overview of Secretory Vesicles01:33

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Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
Various proteins regulate the aggregation of molecules inside the secretory vesicles. Chromogranins...
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Mechanism of Conjugation01:19

Mechanism of Conjugation

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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...
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Formation of Lipopolysaccharides01:19

Formation of Lipopolysaccharides

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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,...
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A Visual Assay to Monitor T6SS-mediated Bacterial Competition
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Redefining the bacterial Type I protein secretion system.

Freya J Hodges1, Von Vergel L Torres1, Adam F Cunningham2

  • 1Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, Australia.

Advances in Microbial Physiology
|March 22, 2023
PubMed
Summary
This summary is machine-generated.

Type I secretion systems (T1SS) transport proteins across bacterial cell envelopes. This review updates the T1SS definition and proposes five subgroups, expanding beyond the classic three-component model for broader applications.

Keywords:
Bacterial secretion systemProtein secretionRTXT1SSType I secretion system

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Type I secretion systems (T1SS) are crucial for protein transport in Gram-negative bacteria.
  • The classic model involves three proteins forming a channel for direct substrate translocation from cytosol to extracellular milieu.
  • The archetypal Escherichia coli hemolysin (HlyA) secretion system is the primary model for T1SS research.

Approach:

  • This review critically examines the limitations of the classic T1SS model.
  • It proposes an updated definition encompassing a wider range of secretion mechanisms.
  • The study subdivides T1SS into five distinct subgroups based on secreted substrates and mechanisms.

Key Points:

  • The classic three-component T1SS model is insufficient to describe the full diversity of these systems.
  • Five new subgroups are proposed: T1SSa (RTX proteins), T1SSb (non-RTX Ca2+-binding proteins), T1SSc (non-RTX proteins), T1SSd (class II microcins), and T1SSe (lipoprotein secretion).
  • These alternative T1SS mechanisms represent significant, yet often overlooked, areas for biotechnological innovation.

Conclusions:

  • The traditional view of T1SS needs revision to accommodate diverse protein secretion pathways.
  • Recognizing these distinct T1SS subgroups enhances our understanding of bacterial protein transport.
  • Exploring these alternative secretion mechanisms opens new avenues for biotechnological applications and discoveries.