Related Experiment Videos
Induction of phage-like particles from a pathogenic strain of Vibrio parahaemolyticus by mitomycin C
Abstract:
A rapid drop of absorbance of cell suspensions due to cell lysis was observed midway in cell growth of a pathogenic strain, Vibrio parahaemolyticus WP1, when the cells were incubated in a growth medium containing mitomycin C. We succeeded in isolating phage-like particles from the cell lysate, but not from that of the non-pathogenic strain, WP28. The purified particle has a clear-cut envelope and is hexagonal in shape with no tail. The size of particles is about 65 millimicrons on the diagonal and about 250 S. The particles contained one kind of protein of 45,000 dalton.
Insights
Researchers isolated novel phage-like particles from pathogenic Vibrio parahaemolyticus WP1 after mitomycin C treatment. These unique hexagonal particles, absent in non-pathogenic strains, may play a role in pathogenicity.
Area of Science:
- Microbiology
- Virology
- Bacteriology
Background:
- Vibrio parahaemolyticus is a significant foodborne pathogen.
- Mitomycin C is known to induce prophage in bacteria.
- Understanding bacterial-host interactions is crucial for public health.
Purpose of the Study:
- To investigate the cause of cell lysis in pathogenic Vibrio parahaemolyticus WP1.
- To isolate and characterize novel phage-like particles induced by mitomycin C.
- To compare particle presence between pathogenic and non-pathogenic strains.
Main Methods:
- Incubation of Vibrio parahaemolyticus strains (WP1 and WP28) in growth medium with mitomycin C.
- Observation of cell suspension absorbance for lysis.
- Isolation and purification of phage-like particles from cell lysates.
- Electron microscopy and size determination of purified particles.
- Protein analysis of isolated particles.
Main Results:
- A rapid decrease in absorbance, indicating cell lysis, was observed in pathogenic Vibrio parahaemolyticus WP1.
- Phage-like particles were successfully isolated from the lysate of the pathogenic strain WP1.
- No such particles were found in the non-pathogenic strain WP28.
- The purified particles were hexagonal, 65 nm in size, possessed an envelope, lacked a tail, and contained a single 45,000-dalton protein.
Conclusions:
- Mitomycin C induces the production of unique phage-like particles in pathogenic Vibrio parahaemolyticus WP1.
- These particles are absent in non-pathogenic strains, suggesting a potential role in pathogenicity.
- The characterized particles represent a novel discovery in Vibrio parahaemolyticus research.