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Specificity of interferon action in protein synthesis
Abstract:
Inhibitors of elongation steps in protein synthesis such as cycloheximide and anisomycin mimic interferon treatment in that they specifically inhibit the synthesis of certain viral proteins. These specific effects are seen only at very low concentrations of the antibiotics, under conditions where host cellular protein synthesis, as well as cell viability, are not severely reduced. A qualitatively as well as quantitatively close correlation between the effects of the two types of agents has been established for encephalomyocarditis virus, vesicular stomatitis virus and murine leukemia virus protein synthesis. It is concluded that one of the primary mechanisms of interferon action may be a nonspecific retardation of one or more elongation steps, and that this may be sufficient to account for its effects on the replication of certain viruses such as encephalomyocarditis and vesicular stomatitis viruses.
Insights
Protein synthesis inhibitors like cycloheximide and anisomycin mimic interferon's antiviral effects by specifically inhibiting viral protein production. This suggests interferon may work by slowing protein elongation, impacting viral replication.
Area of Science:
- Molecular Biology
- Virology
- Biochemistry
Background:
- Interferon treatment inhibits the synthesis of specific viral proteins.
- This inhibition occurs at low antibiotic concentrations, preserving host cell function.
Purpose of the Study:
- To investigate the mechanism by which interferon inhibits viral protein synthesis.
- To compare the effects of protein synthesis inhibitors with interferon treatment on viral replication.
Main Methods:
- Utilizing specific viral protein synthesis inhibitors (cycloheximide, anisomycin).
- Assessing effects on encephalomyocarditis virus, vesicular stomatitis virus, and murine leukemia virus.
- Comparing inhibitor effects with interferon treatment under controlled conditions.
Main Results:
- A strong correlation was observed between the effects of inhibitors and interferon on viral protein synthesis.
- Inhibitors and interferon demonstrated similar specific inhibition patterns for tested viruses.
- Host cell protein synthesis and viability remained largely unaffected.
Conclusions:
- Interferon's antiviral mechanism may involve the nonspecific retardation of protein elongation steps.
- This retardation is sufficient to account for interferon's effects on certain viruses like encephalomyocarditis and vesicular stomatitis viruses.
- The findings provide insight into the molecular basis of interferon's antiviral activity.