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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):...
Overview of Secretory Vesicles01:33

Overview of Secretory Vesicles

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...
Exocrine Glands: Methods of Secretion01:08

Exocrine Glands: Methods of Secretion

Exocrine glands are those that release their secretions through ducts. Based on their mode of secretion, they can be classified into merocrine, apocrine, and holocrine.
Merocrine Secretion
Merocrine secretion is the most common type of exocrine secretion. The secretions are enclosed in vesicles and moved to the cell's apical surface, where the contents are released by exocytosis. For example, mucous, a watery secretion rich in the glycoprotein mucin, is a merocrine secretion. The eccrine glands...
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...
Insulin Secretory Vesicles01:05

Insulin Secretory Vesicles

Insulin secretory vesicles release insulin to stimulate blood glucose uptake and regulate carbohydrate metabolism. When the blood glucose levels increase, glucose enters the pancreatic β-islet cells through glucose transporters. Once inside, glucose is metabolized through glycolysis, the citric acid cycle, and the electron transport chain, producing ATP. This increase in ATP concentration closes ATP-sensitive potassium channels, leading to depolarization of the membrane and the opening of...

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Related Experiment Video

Updated: Jul 7, 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

Type VI secretion: a beginner's guide.

Lewis Eh Bingle1, Christopher M Bailey, Mark J Pallen

  • 1Centre for Systems Biology, University of Birmingham, Edgbaston, Birmingham, UK. l.e.bingle@bham.ac.uk

Current Opinion in Microbiology
|February 22, 2008
PubMed
Summary
This summary is machine-generated.

Type VI secretion is a novel protein transport system in Gram-negative bacteria. Its components and regulation are key to bacterial virulence and interactions with host cells.

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Super-Resolution Imaging of Bacterial Secreted Proteins Using Genetic Code Expansion
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Super-Resolution Imaging of Bacterial Secreted Proteins Using Genetic Code Expansion

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Last Updated: Jul 7, 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

Super-Resolution Imaging of Bacterial Secreted Proteins Using Genetic Code Expansion
13:11

Super-Resolution Imaging of Bacterial Secreted Proteins Using Genetic Code Expansion

Published on: February 10, 2023

Area of Science:

  • Microbiology
  • Bacteriology
  • Molecular Biology

Background:

  • Type VI secretion (T6SS) is a recently identified mechanism for protein transport across the bacterial cell envelope.
  • Key components include IcmF homologues, ClpV ATPase, FHA domain proteins, and secreted VgrG and Hcp proteins.

Purpose of the Study:

  • To elucidate the components and regulatory mechanisms of the Type VI secretion system.
  • To understand the role of T6SS in bacterial virulence and inter-cellular interactions.

Main Methods:

  • Characterization of T6SS components.
  • Analysis of transcriptional and post-transcriptional regulation of T6SS expression.

Main Results:

  • Identified key protein components involved in T6SS.
  • Demonstrated that T6SS expression is tightly controlled at multiple regulatory levels.
  • Highlighted T6SS's role as a virulence factor and its implication in effector protein translocation.

Conclusions:

  • T6SS is a widespread and significant system in Gram-negative bacteria.
  • The regulation of T6SS is complex, involving both transcriptional and post-transcriptional control.
  • T6SS plays a crucial role in bacterial pathogenesis and host-pathogen interactions.