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Characteristics of bacteriophages for Micromonospora purpurea
Abstract:
Chemical and physical stabilities of bacteriophages øUW 21 and øUW 51 infecting Micromonospora purpurea ATCC 15835 were examined. Both phages were stable over the pH range of 5 to 8 and to heating at temperatures up to 50 degrees C and especially stable in buffer containing magnesium ion. Exposure to 1 M Ca(NO3)2 inactivated both phages, and phage øUW 51 was also susceptible to 1 M CaCl2, 0.1 M tris(hydroxymethyl)aminomethane, and 0.3% H2O2. Phage plating efficiency was highest on the cultures at logarithmic phase and sometimes much influenced by host growth. Phage øUW 51 has a latent period of 2 h at 34 degrees C and a burst size between 35 and 40. The latent period for phage øUW 21 is about 12 h, and the burst size is smaller than 30.
Insights
Bacteriophages øUW 21 and øUW 51 infecting Micromonospora purpurea showed stability across a pH range of 5-8 and temperatures up to 50°C, with optimal stability in magnesium ion buffers. Their infectivity is influenced by host growth phase.
Area of Science:
- Microbiology
- Virology
- Bacteriophage Research
Background:
- Bacteriophages are viruses that infect bacteria and are crucial in microbial ecology and potential therapeutic agents.
- Understanding the stability of bacteriophages is essential for their effective application in research and biotechnology.
- Micromonospora purpurea is a bacterial species relevant in various ecological and industrial contexts.
Purpose of the Study:
- To determine the chemical and physical stability profiles of bacteriophages øUW 21 and øUW 51.
- To assess the impact of environmental factors such as pH, temperature, and specific ions on phage viability.
- To characterize the lytic cycle parameters, including latent period and burst size, for both phages.
Main Methods:
- Phages øUW 21 and øUW 51 were subjected to varying pH conditions (5-8) and temperatures (up to 50°C).
- Stability was tested in buffers with magnesium ions and in the presence of specific chemical agents like Ca(NO3)2, CaCl2, tris(hydroxymethyl)aminomethane, and H2O2.
- Phage plating efficiency was evaluated based on host bacterial growth phase, and lytic cycle parameters were measured at 34°C.
Main Results:
- Both phages demonstrated stability within a pH range of 5 to 8 and up to 50°C, with enhanced stability in magnesium ion buffers.
- Exposure to 1 M Ca(NO3)2 inactivated both phages; phage øUW 51 was also inactivated by 1 M CaCl2, 0.1 M tris, and 0.3% H2O2.
- Phage plating efficiency was highest during the logarithmic growth phase of Micromonospora purpurea, indicating host growth dependency. Phage øUW 51 exhibited a 2-hour latent period and a burst size of 35-40, while øUW 21 had a ~12-hour latent period and a burst size <30.
Conclusions:
- Bacteriophages øUW 21 and øUW 51 possess moderate stability under various chemical and physical conditions, particularly in the presence of magnesium ions.
- Specific chemical agents and host growth conditions significantly influence phage viability and infectivity, providing insights for phage handling and application.
- The distinct lytic cycle parameters of øUW 51 and øUW 21 suggest different replication strategies and potential applications in phage therapy or diagnostics.