Related Experiment Video
Updated: Jun 26, 2026
12:52
Use of Shigella flexneri to Study Autophagy-Cytoskeleton Interactions
Published on: September 9, 2014
Structural microengineers: pathogenic Escherichia coli redesigns the actin cytoskeleton in host cells
Neta Sal-Man1, Esther Biemans-Oldehinkel, B Brett Finlay
1Michael Smith Laboratories, The University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.
Structure (London, England : 1993)
|January 15, 2009
Summary
Pathogenic Escherichia coli hijack host cell actin polymerization using effector proteins like EspFu. This manipulation, occurring extracellularly, aids bacterial adherence and invasion, differing from intracellular pathogens.
Area of Science:
- Microbiology
- Cell Biology
- Bacterial Pathogenesis
Background:
- Virulent bacteria manipulate host actin cytoskeleton for invasion and spread.
- Pathogenic Escherichia coli (E. coli) subvert actin polymerization extracellularly to promote adherence.
- Wiskott-Aldrich syndrome proteins are key targets for bacterial manipulation of actin.
Purpose of the Study:
- To review mechanisms of pathogenic E. coli hijacking host actin polymerization.
- To highlight the role of Wiskott-Aldrich syndrome protein family members.
- To discuss the EspFu effector's novel mechanism in actin manipulation.
Main Methods:
- Literature review of recent studies on pathogenic E. coli and host cell actin.
- Analysis of effector proteins involved in actin subversion.
- Focus on Wiskott-Aldrich syndrome protein family interactions.
Main Results:
- Pathogenic E. coli utilize effector proteins to induce actin polymerization from an extracellular position.
- The Wiskott-Aldrich syndrome protein family is crucial for mediating these actin rearrangements.
- The EspFu effector employs a simple mechanism to manipulate actin.
Conclusions:
- Pathogenic E. coli employ sophisticated strategies to subvert host actin dynamics for adherence.
- Understanding these mechanisms, including EspFu's role, is vital for combating E. coli infections.
- Targeting bacterial effectors offers potential therapeutic avenues.
Related Concept Videos
01:18Bacterial Gastroenteritis
Bacterial gastroenteritis, characterized by diarrhea, abdominal cramps, and vomiting, is often caused by ingestion of contaminated food or water and is frequently associated with pathogenic Escherichia coli strains. These microbes exploit two principal mechanisms to inflict disease.Shiga toxin–producing E. coli, also referred to as STEC—notably O157:H7—release Shiga toxins that target ribosomes, blocking protein synthesis. The B subunit of the toxin binds the host glycolipid receptor...
01:10Intracellular Movement of Viruses and Bacteria
Intracellular bacteria and viruses often comprise a group of highly infectious pathogens that can cause several diseases. Bacterial pathogens include those belonging to the genus Rickettsia responsible for conditions such as rocky mountain spotted fever and the Mediterranean spotted fever; Chlamydia, a genus responsible for a sexually transmitted disease; Coxiella burnetii, an agent responsible for Q fever. Viral pathogens include vaccinia—a poxvirus, and herpes simplex virus—a virus that...
01:23Stringent Response in E. coli
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
01:25Colonisation of Pathogens
Pathogen colonization of host tissues is a critical step in the development of infectious diseases. Various pathogenic microorganisms, including bacteria, fungi, viruses, and protozoa, have evolved complex strategies to attach to, invade, and persist within host environments. These mechanisms enable pathogens to establish infections, evade immune responses, and resist antimicrobial treatments.Attachment to Host CellsIn bacteria, colonization typically begins with adherence to host epithelial...
01:27Chemotaxis in E. coli
Chemotaxis in Escherichia coli is a sensory-driven motility mechanism that enables bacteria to navigate chemical gradients, moving toward beneficial environments while avoiding harmful conditions. This process relies on a signal transduction system integrating external chemical cues with flagellar motor control.Chemoreceptors and Signal DetectionE. coli detects chemical gradients through methyl-accepting chemotaxis proteins (MCPs), which are membrane-bound chemoreceptors that sense attractants...
01:20Determinants of Bacterial Pathogenicity and Virulence
Pathogenic bacteria employ a variety of strategies to establish infections, including the secretion of extracellular enzymes that act as potent virulence factors. These enzymes facilitate bacterial colonization of host tissues and help evade immune surveillance. By targeting structural components of host tissues and interfering with immune mechanisms, these enzymes play a pivotal role in disease progression.Extracellular Enzymes Facilitating Tissue Invasion: Several bacterial pathogens secrete...