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[Transfecting activity of Pseudomonas aeruginosa bacteriophage SM]
Abstract:
Factors affecting the efficiency of transfection of Ps. aeruginosa PAO1 cells by the temperate SM bacteriophage DNA have been determined. The efficiency of transfection by DNA preparations isolated from the wild type bacteriophage SMc+ or its thermoinducible mutant SM cts6 is practically the same. The frequency of transfection is (7-9) X 10(4) of infectious centers per mkg of transfecting DNA. Variability in the frequencies of transfection has been registered depending of the infection conditions or on the transfer of the Ps. aeruginosa PAO1 recipient strain population into the competence phase. The efficiency of transfection is increased by the addition of Ca2+ or Mg2+ ions affecting the adsorption and absorbtion of phage DNA by the recipient cells. Optimal concentrations of the bivalent metal ions are 0.15M CaCl2 and 0.2M MgCl2. The results obtained have been used for optimizing the conditions of Ps. aeruginosa PAO1 transfection by SM bacteriophage DNA.
Insights
Optimizing transfection efficiency for Pseudomonas aeruginosa PAO1 cells using SM bacteriophage DNA is achievable. Adding calcium (Ca2+) or magnesium (Mg2+) ions significantly enhances transfection rates for bacterial genetic studies.
Area of Science:
- Microbiology
- Molecular Biology
- Bacteriology
Background:
- Bacteriophages, viruses that infect bacteria, are crucial tools in molecular biology.
- Transfection, the genetic alteration of bacterial cells, is essential for studying bacterial genetics and phage-host interactions.
- Pseudomonas aeruginosa is an opportunistic pathogen with clinical significance, making its genetic manipulation important.
Purpose of the Study:
- To determine factors influencing the efficiency of transfecting Pseudomonas aeruginosa PAO1 cells with SM bacteriophage DNA.
- To optimize conditions for SM bacteriophage DNA transfection in Ps. aeruginosa PAO1.
- To understand the role of divalent metal ions in enhancing transfection frequency.
Main Methods:
- Isolation of DNA from wild-type SM bacteriophage (SMc+) and its thermoinducible mutant (SM cts6).
- Determination of transfection frequencies using infectious centers assay.
- Assessment of the impact of divalent metal ions (Ca2+, Mg2+) and cell competence on transfection efficiency.
Main Results:
- Transfection efficiency was similar for DNA from wild-type and mutant SM bacteriophages.
- Transfection frequency ranged from 7-9 X 10^4 infectious centers per µg of DNA.
- Addition of Ca2+ (0.15M CaCl2) or Mg2+ (0.2M MgCl2) significantly increased transfection efficiency.
- Cell competence and infection conditions influenced transfection variability.
Conclusions:
- Divalent metal ions (Ca2+ and Mg2+) play a critical role in enhancing SM bacteriophage DNA transfection in Ps. aeruginosa PAO1.
- Optimized concentrations of CaCl2 and MgCl2 can substantially improve transfection efficiency.
- These findings provide a basis for improved genetic manipulation of Ps. aeruginosa using SM bacteriophage DNA.