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Related Concept Videos

Bacterial Toxins01:12

Bacterial Toxins

Bacterial toxins are sophisticated virulence factors that enable pathogenic bacteria to interact with, invade, and damage host tissues. These toxins fall broadly into two types: protein exotoxins, which are secreted into the environment and target specific host receptors, and lipopolysaccharide endotoxins, which are structural components of the bacterial outer membrane released primarily during bacterial lysis or membrane shedding. Exotoxins generally act more selectively, binding to cell...
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):...
Receptor-mediated Endocytosis01:20

Receptor-mediated Endocytosis

Receptor-mediated endocytosis is when bulk amounts of specific molecules are imported into a cell after binding to cell surface receptors. The molecules bound to these receptors are taken into the cell through inward folding of the cell surface membrane, which is eventually pinched off into a vesicle within the cell. Structural proteins, such as clathrin, coat the budding vesicle.
Clathrin-Mediated Endocytosis of LDL
One well-characterized example of receptor-mediated endocytosis is the...
Receptor-mediated Endocytosis01:38

Receptor-mediated Endocytosis

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

Insertion of Single-pass Transmembrane Proteins in the RER

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.
Integral transmembrane proteins possess transmembrane and extra membrane domains. The transmembrane domains are primarily made of 20-25 hydrophobic amino acids arranged in a helical secondary confirmation. These...

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Related Experiment Video

Updated: May 19, 2026

Detection of Toxin Translocation into the Host Cytosol by Surface Plasmon Resonance
10:41

Detection of Toxin Translocation into the Host Cytosol by Surface Plasmon Resonance

Published on: January 3, 2012

Bacterial toxin effector-membrane targeting: outside in, then back again.

Brett Geissler1

  • 1Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University Chicago, IL, USA. b-geissler@northwestern.edu

Frontiers in Cellular and Infection Microbiology
|August 25, 2012
PubMed
Summary

Pathogenic bacteria deliver toxins into host cells using various strategies. This review explores how bacterial effectors target the host plasma membrane to cause cellular damage and infection.

Keywords:
bacterial effectorsintracellular targetingplasma membranetoxins

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Area of Science:

  • Microbiology
  • Cell Biology
  • Molecular Biology

Background:

  • Pathogenic bacteria employ diverse mechanisms to infect eukaryotic cells and exert toxicity.
  • Bacterial toxins can be directly injected or secreted, requiring distinct cellular entry pathways.
  • Intracellular bacterial proteins must identify specific host targets to manipulate cellular functions.

Purpose of the Study:

  • To review the strategies used by bacterial effectors to target the host plasma membrane.
  • To understand how bacterial proteins associate with the plasma membrane for host cell manipulation.

Main Methods:

  • Literature review of studies on bacterial effector targeting.
  • Analysis of mechanisms for bacterial protein localization to the plasma membrane.
  • Examination of host-pathogen interactions at the cellular level.

Main Results:

  • Bacterial effectors utilize specific targeting motifs to reach the plasma membrane.
  • Post-translational modifications play a role in regulating effector localization.
  • The plasma membrane is a common and critical target for bacterial manipulation.

Conclusions:

  • Bacterial effectors have evolved sophisticated strategies to access and associate with the host plasma membrane.
  • Understanding these targeting mechanisms is crucial for developing novel antimicrobial therapies.
  • The plasma membrane serves as a key hub for bacterial interference with host cell processes.