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2',5'-oligoadenylate synthetase in interferon-treated chick cells
Texas Reports on Biology and Medicine
|January 1, 1981
Summary
Chick embryo cells produce high levels of 2-5A synthetase in response to interferon, indicating gene derepression. This enzyme, activated by dsRNA, transfers AMP from ATP, but its full physiological role requires further study.
Area of Science:
- Biochemistry
- Molecular Biology
- Cellular Immunology
Background:
- Interferon (IFN) is a crucial cytokine in the innate immune response.
- Interferon-inducible enzymes play significant roles in antiviral defense.
- The 2-5A synthetase enzyme is a key mediator of interferon's antiviral activity.
Purpose of the Study:
- To investigate the mechanism of 2-5A synthetase induction by interferon in chick embryo cells.
- To characterize the biochemical properties of the 2-5A synthetase enzyme.
- To explore the potential physiological substrates and functions of 2-5A synthetase.
Main Methods:
- Cell culture of chick embryo cells.
- Interferon treatment and enzyme activity assays.
- Partial protein purification and molecular weight determination.
- Enzyme kinetics and substrate analysis.
Main Results:
- Interferon induces high levels of 2-5A synthetase activity, suggesting gene derepression.
- Maximal enzyme induction requires continuous interferon exposure.
- The synthetase is a 56,000 MW polypeptide that, upon dsRNA binding, transfers AMP from ATP.
- Several natural adenylate acceptors were identified, though their physiological relevance is unclear.
Conclusions:
- The induction of 2-5A synthetase by interferon involves regulated gene expression.
- The characterized 2-5A synthetase enzyme possesses nucleotidyl transferase activity.
- Further research is needed to elucidate the physiological significance of the identified adenylylation reactions.