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Related Concept Videos

Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Surface Membrane Barriers01:18

Surface Membrane Barriers

The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
The outer layer of the skin, the epidermis, is a robust barrier comprising layers of closely packed keratinized cells. This dense arrangement prevents microbes from penetrating the body. The periodic shedding of epidermal cells...
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):...
Biological Methods for Microbial Control01:28

Biological Methods for Microbial Control

Biological agents offer an effective means of controlling microbial growth by leveraging natural processes like predation, competition, and the secretion of antimicrobial substances.Predatory bacteria such as Bdellovibrio species target and kill pathogens like Salmonella and E. coli. They are widely used in poultry farms to control infections. Myxococcus species help combat plant-pathogenic fungi. These naturally occurring predators serve as eco-friendly alternatives to chemical pesticides and...
Defense Mechanism Against Infection01:26

Defense Mechanism Against Infection

Natural flora, body system defenses, and inflammation are natural barriers of the body against infectious agents regardless of previous exposure. Normal floras of the human body refer to the microbial population that colonizes the skin and mucous membranes.
In addition, many body organ systems have unique defenses against infection. The skin is an intact, multilayered surface preventing invasion by microorganisms unless impaired. Mucous membranes lining the mouth, nose, and eyelids are barriers...
Antifungal Agents01:15

Antifungal Agents

Amphotericin B is a broad-spectrum antifungal agent that exploits structural differences between fungal and mammalian cell membranes. Its amphipathic structure—featuring a hydrophobic polyene-lactone ring and a hydrophilic region containing mycosamine and carboxylic acid groups—enables selective binding to ergosterol, a sterol predominantly found in fungal plasma membranes. This selective interaction underlies the drug’s antifungal activity, although weak binding to cholesterol contributes to...

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Related Experiment Video

Updated: May 13, 2026

Quantification of Interbacterial Competition using Single-Cell Fluorescence Imaging
07:34

Quantification of Interbacterial Competition using Single-Cell Fluorescence Imaging

Published on: September 2, 2021

Secretion Systems Used by Bacteria to Counteract Fungal Competitors.

Peishuai Fu1, Liya Zhang1, Xiaofang Ma1

  • 1State Key Laboratory for Crop Stress Resistance and High-Efficiency Production, Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Sciences, Northwest A&F University, Yangling 712100, China.

Biology
|May 12, 2026
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Summary

Bacterial secretion systems (BSSs) fight fungi through direct attacks and ecological competition. Understanding these bacterial antifungal strategies can lead to new sustainable interventions.

Keywords:
antifungal mechanismsbacterial secretion systemsbacterial–fungal interactions

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Area of Science:

  • Microbiology
  • Mycology
  • Biochemistry

Background:

  • Bacterial secretion systems (BSSs) are known to possess antifungal properties, but a comprehensive framework is lacking.
  • Existing evidence on bacterial-fungal warfare mediated by BSSs is fragmented.
  • A unified understanding of bacterial antifungal strategies is needed.

Purpose of the Study:

  • To survey bacterial secretion systems (Type I-XI) for their antifungal potential.
  • To integrate experimental data and mechanistic predictions of BSS antifungal activities.
  • To establish a framework for understanding bacterial antifungal warfare.

Main Methods:

  • Systematic survey of bacterial secretion systems (Type I-XI).
  • Integration of experimentally validated antifungal activities.
  • Mechanism-based predictions of antifungal potential.

Main Results:

  • BSSs exhibit dual antifungal strategies: direct fungicidal attack and ecological competition.
  • Direct attack involves effector-mediated disruption of fungal integrity.
  • Ecological competition includes nutrient/niche occupation and population-level coordination.

Conclusions:

  • Mechanistic understanding of bacterial antifungal strategies is limited by current models and data.
  • Future research requires integrated models, high-throughput platforms, and multi-omics analyses.
  • BSSs offer promising platforms for developing sustainable antifungal interventions in agriculture and medicine.