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Bacteriophage phi 29 infection of Bacillus subtilis minicells
Abstract:
Bacteriophage phi 29 can infect B. subtilis minicells and synthesize all the phage-coded proteins detected in ultraviolet irradiated-infected B. subtilis cells. Synthesis of phage unit-length DNA has been obtained after infection of minicells with phi 29. The DNA can be encapsulated in particles with a sedimentation rate similar to that of phage phi 29 produced in B. subtilis cells. The particles produced in minicells can be adsorbed to B. subtilis cells, but infectivity has not been demonstrated because of the very low burst-size obtained.
Insights
Bacteriophage phi 29 successfully infects Bacillus subtilis minicells, producing phage DNA and protein. While particles assemble and adsorb, low burst-size limits demonstrated infectivity in this novel system.
Area of Science:
- Molecular Biology
- Virology
- Microbiology
Background:
- Bacteriophages are viruses that infect bacteria.
- Bacillus subtilis minicells are small, anucleate cells derived from B. subtilis, useful for studying cellular processes.
- Bacteriophage phi 29 is a well-characterized DNA virus infecting B. subtilis.
Purpose of the Study:
- To investigate the ability of bacteriophage phi 29 to infect and replicate within Bacillus subtilis minicells.
- To characterize the phage-coded proteins and DNA synthesized in infected minicells.
- To assess the assembly and potential infectivity of phage particles produced in minicells.
Main Methods:
- Infection of B. subtilis minicells with bacteriophage phi 29.
- Detection and analysis of phage-coded proteins synthesized post-infection.
- Analysis of phage DNA synthesis and particle formation using sedimentation rate.
- Assessment of particle adsorption to B. subtilis cells.
Main Results:
- Bacteriophage phi 29 successfully infected B. subtilis minicells.
- All phage-coded proteins, similar to those in infected B. subtilis cells, were synthesized.
- Unit-length phage DNA was synthesized and encapsulated into particles with sedimentation rates comparable to native phi 29.
- Particles produced in minicells adsorbed to B. subtilis cells, but infectivity was not confirmed due to very low burst-size.
Conclusions:
- B. subtilis minicells can support the complete vegetative cycle of bacteriophage phi 29, including DNA and protein synthesis.
- This study demonstrates the potential of using minicells as a system for bacteriophage production and study.
- Further optimization is needed to overcome the low burst-size and demonstrate robust infectivity of minicell-derived phi 29 particles.