Related Experiment Videos
[Differential sensitivity of bacteria to histones]
Mikrobiologiia
|January 1, 1976
Summary
Histones, nuclear proteins rich in lysine and arginine, exhibit differential antimicrobial effects on Pseudomonas bacteria. Bacterial sensitivity to histones correlates with a longer lag period, not with histone inactivation or sorption rates.
Area of Science:
- Microbiology
- Biochemistry
- Molecular Biology
Background:
- Polycationic proteins, specifically histones, are nuclear proteins abundant in lysine and arginine.
- Histones are known to possess antimicrobial properties, but their specific interactions with bacterial species require further elucidation.
Purpose of the Study:
- To investigate the antimicrobial action of histones on various species and strains of Pseudomonas bacteria.
- To determine the factors influencing differential sensitivity of Pseudomonas to histones.
Main Methods:
- Studied the differential sensitivity of various Pseudomonas species and strains to histones.
- Assessed the liberation of low molecular weight components and changes in RNA/RNase activity.
- Correlated observed phenomena with bacterial lag period, growth rate, and total cell yield.
Main Results:
- Identified differential sensitivity among Pseudomonas species and strains to histones.
- Observed interference with membrane permeability, leading to the release of UV-absorbing components (260 nm).
- Found increased RNase activity and RNA depolymerization, but no correlation with histone sensitivity.
- Established a positive correlation between the duration of the lag period and bacterial sensitivity to histones.
Conclusions:
- Histone-bacterial interactions disrupt membrane permeability and cellular components.
- Bacterial sensitivity to histones is linked to the lag phase duration, suggesting a complex interplay beyond simple inactivation or sorption.