Related Experiment Video
Updated: Jun 17, 2025
07:43
Coincubation Assay for Quantifying Competitive Interactions between Vibrio fischeri Isolates
Published on: July 22, 2019
8.0K
A coordinated attack by a bacterial secretion system and a small molecule drives prey specificity.
Communications Biology
|August 8, 2024
Summary
Aeromonas dhakensis strain A603 exhibits potent bactericidal activity against Vibrio species. This activity is mediated by a Type Six Secretion System (T6SS) and a novel molecule, Ad-Phen, which work together to kill Vibrio.
Area of Science:
- Microbiology
- Bacteriology
- Antimicrobial Discovery
Background:
- Vibrio species are significant causes of food- and water-borne illnesses.
- Effective treatments against Vibrio infections are crucial for public health.
Purpose of the Study:
- To identify bacterial strains with bactericidal activity against Vibrio.
- To characterize the mechanisms behind this observed antibacterial activity.
Main Methods:
- Screening of bacterial strains from raw food shrimp.
- Genomic and genetic analysis of Aeromonas dhakensis strain A603.
- Investigating the roles of Type Six Secretion System (T6SS) and Ad-Phen.
Main Results:
- Aeromonas dhakensis A603 demonstrated specific bactericidal activity against Vibrio species.
- Two key mechanisms identified: a potent T6SS and a vibriocidal molecule, Ad-Phen.
- Ad-Phen and T6SS effector TseC are coregulated, enhancing Vibrio cholerae killing.
Conclusions:
- Aeromonas dhakensis A603 is a promising source for novel antibacterial agents against Vibrio.
- The combined action of T6SS and Ad-Phen represents a potent dual-action antimicrobial strategy.
- Understanding these mechanisms can inform the development of new therapies for Vibrio infections.
Related Concept Videos
01:30Bacterial Signaling
31.9K
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...
31.9K
01:31Defense Against Bacterial Pathogens
1.4K
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...
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...
1.4K
02:53CRISPR and crRNAs
16.9K
Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
16.9K
02:39Predator-Prey Interactions
16.2K
Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.
16.2K
01:20Receptor-mediated Endocytosis
6.0K
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...
Clathrin-Mediated Endocytosis of LDL
One well-characterized example of receptor-mediated endocytosis is the...
6.0K
01:27Complement System
2.3K
The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
2.3K