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Related Concept Videos

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...
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: Types of Secretions01:13

Exocrine Glands: Types of Secretions

Exocrine glands produce and release a variety of glandular products. Exocrine glands can be classified into serous, mucous, or mixed types based on their secretory products.
Serous glands produce watery secretions rich in digestive enzymes and proteins. The constituent cells of the serous gland have centrally located nuclei and eosinophilic secretory granules in the cytoplasm. The parotid gland is an example of a serous gland. It secretes saliva, which contains enzymes, such as lipases and...
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):...
Fusion of Secretory Vesicles with the Plasma Membrane01:26

Fusion of Secretory Vesicles with the Plasma Membrane

Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
Tubular Reabsorption and Secretion01:28

Tubular Reabsorption and Secretion

Tubular secretion and reabsorption are two critical processes in the nephron tubule of the kidneys. When the fluid filtered from the glomerulus enters the proximal convoluted tubule, it is referred to as filtrate, and its composition changes due to tubular reabsorption and secretion.
Tubular reabsorption is a selective process that starts when the filtrate enters the proximal tubules. It involves substances traveling through the transcellular route (through the tubule cell and peritubular...

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A High-Yield Streptomyces Transcription-Translation Toolkit for Synthetic Biology and Natural Product Applications
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The type VI secretion toolkit.

Eric Cascales1

  • 1Laboratoire d'Ingénierie des Systèmes Macromoléculaires, IBSM, Centre National de la Recherche Scientifique, Marseille, France. cascales@ibsm.cnrs-mrs.fr

EMBO Reports
|July 12, 2008
PubMed
Summary
This summary is machine-generated.

The type VI secretion system (T6SS) is a bacterial machine that injects toxins into host cells. This review covers T6SS gene regulation, components, and effects on host cells.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Cell Biology

Background:

  • Bacterial secretion systems deliver virulence factors to host cells, aiding infection and survival.
  • The type VI secretion system (T6SS) is a recently characterized secretion pathway found in many bacterial pathogens.
  • Understanding T6SS is crucial for developing strategies against bacterial infections.

Purpose of the Study:

  • To provide a comprehensive overview of the type VI secretion system (T6SS).
  • To summarize current knowledge on T6SS gene regulation, machinery, and function.
  • To discuss the impact of T6SS on host cells.

Main Methods:

  • Literature review of published research on T6SS.
  • Analysis of genomic data for T6SS distribution.
  • Synthesis of findings on T6SS mechanisms and host interactions.

Main Results:

  • T6SS are prevalent in bacteria interacting with eukaryotic cells, including plant and animal pathogens.
  • Research is actively elucidating T6SS mechanisms and effector protein functions.
  • T6SS components and their regulation are key to understanding bacterial pathogenesis.

Conclusions:

  • The type VI secretion system (T6SS) represents a significant virulence mechanism in bacteria.
  • Further research into T6SS will illuminate bacterial infection strategies and host responses.
  • Knowledge of T6SS is vital for combating bacterial diseases.