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Inhibition of influenza virus replication by -amanitin: mode of action
Abstract:
The replication of influenza virus in chick embryo fibroblast cells is inhibited by alpha-amanitin added during the first 2 hr of infection at concentrations similar to those required to inhibit cellular DNA-dependent RNA polymerase form II in vivo. Of two periods of increased RNA synthesis observed in cells infected with influenza virus, only the first, occurring from 0 to 2 hr after infection, is sensitive to alpha-amanitin. During this early period, there is a stimulation of the activity of DNA-dependent RNA polymerase II of nuclei isolated from infected cells. The data suggest that DNA transcription mediated by polymerase II is essential for influenza virus replication.
Insights
Alpha-amanitin inhibits influenza virus replication by blocking early DNA transcription. This suggests that DNA-dependent RNA polymerase II is essential for viral replication, impacting early stages of infection.
Area of Science:
- Virology
- Molecular Biology
- Cell Biology
Background:
- Influenza virus replication involves complex interactions with host cell machinery.
- Understanding the host factors essential for viral replication is crucial for developing antiviral strategies.
Purpose of the Study:
- To investigate the role of host cell DNA-dependent RNA polymerase II in influenza virus replication.
- To determine the sensitivity of influenza virus replication to inhibitors of RNA polymerase II.
Main Methods:
- Chick embryo fibroblast cells were infected with influenza virus.
- Alpha-amanitin, an inhibitor of DNA-dependent RNA polymerase II, was added at different time points.
- RNA synthesis and polymerase II activity were measured in infected cells.
Main Results:
- Alpha-amanitin inhibited influenza virus replication when added within the first 2 hours of infection.
- Only the early phase of RNA synthesis (0-2 hr post-infection) was sensitive to alpha-amanitin.
- Activity of DNA-dependent RNA polymerase II in isolated nuclei was stimulated during the early infection period.
Conclusions:
- DNA transcription mediated by DNA-dependent RNA polymerase II is essential for influenza virus replication.
- Targeting early viral transcription could be a viable antiviral approach.