Related Experiment Videos
[Changes in Bacillus pumilus antibiotic activity and sensitivity with integration and disintegration of plasmid pPL
Abstract:
The role of plasmid pPL 7065 in the control of the antibiotic production and sensitivity in Bac. pumilus was studied with the use a plasmid-free strain and strains containing the plasmid in the cells in a free or chromosome-integrated state. It was found that all the strains had antibiotic activity only with respect to a limited number of gram-positive bacteria. Still, the antibiotics produced by them differed in the antibacterial spectrum. The antibiotic produced by the plasmid-free strain had a broader spectrum. It was shown that the bacteria with the plasmid in th free state were sensitive to the antibiotics produced by the plasmid-free strain for the strain or the strain with the chromosome-integrated plasmid. It was suggested that plasmid pPL 7065 played the role of a modifier of the antibiotic activity and sensitivity in Bac. pumilus and carried no genetic information for the control of the antibiotic synthesis. Their formation is determined by the chromosome genes.
Insights
Plasmid pPL 7065 modifies antibiotic production and sensitivity in Bacillus pumilus. Chromosome genes control antibiotic synthesis, not this specific plasmid.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Bacillus pumilus produces antibiotics, but the genetic control mechanisms are not fully understood.
- Plasmids are known to influence bacterial traits, including antibiotic resistance and production.
Purpose of the Study:
- To investigate the role of plasmid pPL 7065 in antibiotic production and sensitivity in Bacillus pumilus.
- To determine if plasmid pPL 7065 carries genetic information for antibiotic synthesis or acts as a modifier.
Main Methods:
- Comparative analysis of antibiotic activity and spectrum using plasmid-free Bacillus pumilus strains.
- Comparison with strains containing plasmid pPL 7065 in free or integrated states.
- Assessment of bacterial sensitivity to produced antibiotics.
Main Results:
- All studied Bacillus pumilus strains exhibited antibiotic activity against a limited range of Gram-positive bacteria.
- Antibiotics produced by different strains varied in their antibacterial spectrum, with the plasmid-free strain showing a broader spectrum.
- Bacteria harboring plasmid pPL 7065 were sensitive to antibiotics from the plasmid-free strain.
Conclusions:
- Plasmid pPL 7065 appears to modify antibiotic activity and sensitivity in Bacillus pumilus rather than controlling synthesis.
- Antibiotic synthesis in Bacillus pumilus is primarily determined by chromosomal genes.
- The plasmid's role is modulatory, influencing the expression or characteristics of chromosomally-encoded antibiotic production.