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Transfection mediated by Mycoplasmatales viral DNA
Abstract:
DNA isolated from Mycoplasmatales viruses MVL51 and MVGs51 was infectious when mixed with Acholeplasma laidlawii BN1-Na1(R) cells. Infectivity was destroyed by deoxyribonuclease but not by ribonuclease, Pronase, or specific antiserum to the virus. Host mycoplasma cells were only competent for transfection during late-log growth phase. The rates of the establishment of DNase insensitivity of viral DNA transfectants were similar to those of bacteriophage systems. The dose-response curve for transfection suggested that an average of six molecules of DNA must interact with a cell in order to produce one infectious center. Mycoplasmatales virus DNA exhibited a low efficiency of infection; one infectious center required 4 x 10(5) virus equivalents of DNA.
Insights
Infectious DNA from Mycoplasmatales viruses MVL51 and MVGs51 successfully infected Acholeplasma laidlawii cells. Viral DNA transfection efficiency was low, requiring multiple DNA molecules per cell for infection.
Area of Science:
- Microbiology
- Virology
- Molecular Biology
Background:
- Mycoplasmatales viruses are unique prokaryotic viruses.
- Understanding their DNA infectivity is crucial for virology research.
- Acholeplasma laidlawii serves as a model host for studying these viruses.
Purpose of the Study:
- To investigate the infectivity of Mycoplasmatales virus DNA.
- To determine the optimal conditions for viral DNA transfection.
- To characterize the efficiency of Mycoplasmatales virus DNA infection.
Main Methods:
- Isolation and purification of DNA from Mycoplasmatales viruses MVL51 and MVGs51.
- Transfection experiments using Acholeplasma laidlawii BN1-Na1(R) cells.
- Enzymatic assays (DNase, RNase) and antiserum treatment to confirm DNA infectivity.
- Growth phase analysis of host cell competence for transfection.
- Dose-response analysis to determine DNA molecule requirements for infection.
Main Results:
- Mycoplasmatales virus DNA demonstrated infectivity in Acholeplasma laidlawii cells.
- Infectivity was confirmed to be DNA-dependent, as it was sensitive to DNase but resistant to RNase, Pronase, and specific antiserum.
- Host cell competence for transfection was restricted to the late-log growth phase.
- The establishment of DNase insensitivity in transfectants mirrored bacteriophage systems.
- Transfection efficiency was low, with approximately six DNA molecules needed per cell for an infectious center, and 4 x 10^5 virus equivalents of DNA required per infectious center.
Conclusions:
- Mycoplasmatales virus DNA is infectious and capable of transfecting host cells.
- Host cell growth phase significantly impacts transfection efficiency.
- The infection process shares similarities with bacteriophage systems, suggesting conserved molecular mechanisms.
- Further research into Mycoplasmatales virus replication and infection dynamics is warranted.