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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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ATP Driven Pumps I: An Overview01:27

ATP Driven Pumps I: An Overview

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ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and...
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Protein Transport to the Thylakoids01:22

Protein Transport to the Thylakoids

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Thylakoids are membrane-bound sac-like structures within the chloroplast that serve as sites for photosynthesis. Thylakoid lumen contains many electron transport proteins and is enclosed by a thylakoid membrane rich in the light-harvesting complex. Proteins targeted to the thylakoids are transported as precursors and are sorted by the general TOC/TIC import pathway. Once the precursor reaches the stroma, stromal processing peptidases remove their transit signal and expose thylakoid signal...
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Overview of Protein Sorting and Transport01:45

Overview of Protein Sorting and Transport

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Eukaryotic cells have different membrane-bound organelles with distinct protein requirements. The process by which proteins are targeted to a specific organelle is called protein sorting.
Protein sorting can be of two types: signal-based sorting and vesicle-based trafficking. In signal-based sorting, specific amino acid sequences called sorting signals target proteins to the proper location inside the cell either via gated transport or by protein translocation.  In gated transport, folded...
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ATP Driven Pumps III: V-type Pumps01:30

ATP Driven Pumps III: V-type Pumps

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V-type pumps are ATP-driven pumps found in the vacuolar membranes of plants, yeast, endosomal and lysosomal membranes of animal cells, plasma membranes of a few specialized eukaryotic cells, and some prokaryotes. They are also known as the V1Vo-ATPase, that couple ATP hydrolysis to transport protons against a concentration gradient.
The peripheral or cytosolic V1 domain with eight subunits is involved in ATP hydrolysis. The integral or transmembrane V0 domain containing at least five subunits...
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Related Experiment Video

Updated: Jul 26, 2025

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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DNA Transport through the Dynamic Type IV Secretion System.

Mackenzie E Ryan1, Prashant P Damke2, Carrie L Shaffer1,2,3,4

  • 1Department of Microbiology, Immunology, and Molecular Genetics, University of Kentucky College of Medicine, Lexington, Kentucky, USA.

Infection and Immunity
|June 20, 2023
PubMed
Summary
This summary is machine-generated.

The type IV secretion system (T4SS) nanomachine is key to bacterial infections and spreading antibiotic resistance. Recent studies reveal new mechanisms for DNA transport, showing T4SS adaptability and novel functions in DNA exchange.

Keywords:
DNA conjugationT4SScompetencehost-pathogen interactionstype IV secretion system

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Monitoring the Assembly of a Secreted Bacterial Virulence Factor Using Site-specific Crosslinking
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Monitoring the Assembly of a Secreted Bacterial Virulence Factor Using Site-specific Crosslinking

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Related Experiment Videos

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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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Monitoring the Assembly of a Secreted Bacterial Virulence Factor Using Site-specific Crosslinking
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Conjugative Mating Assays for Sequence-specific Analysis of Transfer Proteins Involved in Bacterial Conjugation
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Conjugative Mating Assays for Sequence-specific Analysis of Transfer Proteins Involved in Bacterial Conjugation

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Pathogenesis

Background:

  • The type IV secretion system (T4SS) is a crucial nanomachine in bacteria.
  • It plays a significant role in bacterial pathogenesis and the spread of antibiotic resistance.
  • T4SSs are involved in DNA conjugation, effector protein delivery, and DNA uptake/export.

Purpose of the Study:

  • To review the molecular mechanisms of DNA translocation through diverse T4SSs.
  • To highlight architectural features enabling DNA exchange and transkingdom DNA release.
  • To detail how T4SS architecture and substrate recruitment drive functional diversity.

Main Methods:

  • Review of recent advances in T4SS research.
  • Analysis of molecular mechanisms of DNA transport.
  • Emphasis on structural and functional studies of T4SS nanomachines.

Main Results:

  • T4SSs exhibit functional plasticity and evolutionary adaptations for novel capabilities.
  • New mechanisms for unilateral nucleic acid transport via T4SS have been identified.
  • Architectural features facilitate DNA exchange across bacterial membranes and beyond.

Conclusions:

  • Understanding T4SS DNA translocation mechanisms is vital for combating bacterial pathogenesis and resistance.
  • T4SS diversity arises from variations in architecture and substrate recruitment.
  • Further research will elucidate the full scope of T4SS functions in DNA transfer.