Related Experiment Video
Updated: Nov 6, 2025
Quantifying the Cytotoxicity of Staphylococcus aureus Against Human Polymorphonuclear Leukocytes
Published on: January 3, 2020
Characterization of R-pyocin activity against Gram-positive pathogens for the first time with special focus on
A A Mohamed1, A M Elshawadfy1, G Amin1
1Department of Microbiology and Botany, Faculty of Science, Zagazig University, Zagazig, Egypt.
This study characterizes R-pyocin from Pseudomonas aeruginosa, demonstrating its potent antimicrobial and anti-biofilm activity against Gram-positive pathogens like Staphylococcus aureus. R-pyocin shows promise as a therapeutic agent, particularly against antibiotic-resistant strains.
Area of Science:
- Microbiology
- Bacteriology
- Antimicrobial Research
Background:
- Pseudomonas aeruginosa produces R-pyocins, bacteriocins with potential antimicrobial properties.
- Staphylococcus aureus is a significant Gram-positive pathogen, often exhibiting antibiotic resistance.
- Understanding R-pyocin's activity against Gram-positive bacteria is crucial for developing novel therapeutic strategies.
Purpose of the Study:
- To characterize the antimicrobial and anti-biofilm activity of R-pyocin (RPU15) from Pseudomonas aeruginosa.
- To investigate the mechanism of R-pyocin action against Staphylococcus aureus.
- To evaluate R-pyocin's efficacy against antibiotic-resistant Gram-positive pathogens.
Main Methods:
- Detection and typing of pyocinogenic P. aeruginosa.
- Transmission electron microscopy (TEM) for R-pyocin morphology and S. aureus membrane damage.
- SDS-PAGE for R-pyocin subunit molecular weight determination.
- Lipoteichoic acid (LTA) adsorption assay to identify R-pyocin receptor.
- Assessment of R-pyocin production, host range, and stability.
- Evaluation of anti-biofilm activity against sensitive and resistant strains.
Main Results:
- R-pyocin (RPU15) exhibited typical myotailocin morphology and formed pores in S. aureus membranes.
- R-pyocin demonstrated activity against S. aureus, Listeria monocytogenes, Bacillus cereus, and Candida albicans.
- Lipoteichoic acid (LTA) of S. aureus and L. monocytogenes neutralized R-pyocin activity.
- RPU15 reduced biofilm-biomasses of tested antimicrobial-resistant strains.
- R-pyocin production was observed across a temperature range of 10-60°C.
Conclusions:
- R-pyocin displays significant antimicrobial and anti-biofilm potential against Gram-positive pathogens.
- The findings suggest R-pyocin as a promising therapeutic agent for targeting resistant strains like MRSA and VRE.
- This study highlights a novel phenomenon of bacteriophage-like plaques induced by R-pyocin.
More Related Videos
07:44Time-Lapse Epifluorescence Microscopy Imaging of Pseudomonas aeruginosa and Staphylococcus aureus Heterogeneous Phenotypes
Published on: February 14, 2025
06:36Improved Enzyme Protection Assay to Study Staphylococcus aureus Internalization and Intracellular Efficacy of Antimicrobial Compounds
Published on: September 8, 2021
