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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 signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
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Receptor-mediated Endocytosis01:20

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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.
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Mechanism of Conjugation01:19

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Bacterial conjugation is a mechanism of horizontal gene transfer that enables the exchange of genetic material between bacterial cells through direct contact. This process is facilitated by a donor cell carrying a conjugative plasmid, which encodes genes necessary for pilus formation, DNA replication, and transfer. The conjugative plasmid plays a central role in initiating and executing the transfer of genetic material.The tra region of the conjugative plasmid encodes proteins responsible for...
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Viral Replication: Lytic Cycle01:20

Viral Replication: Lytic Cycle

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Bacteriophages, or phages, are viruses that specifically infect bacteria. Among them, T-even bacteriophages, such as T4, exhibit a well-characterized lytic replication cycle in Escherichia coli (E. coli). This process ensures the rapid proliferation of the virus while ultimately leading to the destruction of the bacterial host.Attachment and DNA InjectionThe infection process begins with the recognition and binding of the T4 phage to the E. coli cell surface. Tail fibers of the phage...
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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...
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Related Experiment Video

Updated: Jul 11, 2025

Electroporation of Functional Bacterial Effectors into Mammalian Cells
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Bacteria manipulate host cells with channel-forming effectors.

Yukun Liu1, Shuguo Hou2

  • 1College of Forestry, Southwest Forestry University, 300 Bailong Si, Kunming, Yunnan 650224, China.

Trends in Microbiology
|November 12, 2023
PubMed
Summary

Bacterial effectors form membrane channels in host cells. This allows pathogens to access water and solutes, aiding their multiplication and subverting host immunity.

Keywords:
Erwinia amylovoraPseudomonas syringaechannel-forming proteinseffectorstype III secretion system

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Analysis of Yersinia enterocolitica Effector Translocation into Host Cells Using Beta-lactamase Effector Fusions
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Area of Science:

  • Microbiology
  • Cell Biology
  • Pathogen-Host Interactions

Background:

  • Bacterial pathogens inject effector proteins into host cells to manipulate cellular processes.
  • Effectors are crucial for subverting host immunity and facilitating infection.
  • Understanding effector function is key to developing new antimicrobial strategies.

Purpose of the Study:

  • To investigate the novel function of bacterial effectors in host cell manipulation.
  • To determine how bacterial effectors facilitate pathogen survival and multiplication within host cells.

Main Methods:

  • Utilized advanced microscopy techniques to visualize effector-host interactions.
  • Performed biochemical assays to analyze the molecular mechanisms of effector activity.
  • Conducted genetic analyses to confirm the role of specific effectors in channel formation.

Main Results:

  • Demonstrated that specific bacterial effectors form functional membrane channels in host cells.
  • Showed that these channels facilitate the passage of water and essential solutes.
  • Confirmed that effector-mediated channel formation is critical for bacterial growth within the host.

Conclusions:

  • Bacterial effectors can directly modify host cell membranes to create nutrient channels.
  • This mechanism represents a novel strategy for pathogens to acquire resources for replication.
  • Targeting these effector-induced channels could offer new therapeutic avenues against bacterial infections.