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. 1987 Feb;84(3):658–662. doi: 10.1073/pnas.84.3.658

Loss of (2'-5')oligoadenylate synthetase activity by production of antisense RNA results in lack of protection by interferon from viral infections.

A De Benedetti, B A Pytel, C Baglioni
PMCID: PMC304274  PMID: 2433688

Abstract

An expression vector was constructed that carries part of the human BK papovavirus with 0.5 kilobases of (2'-5')oligoadenylate (2-5A) synthetase cDNA inserted in inverted orientation downstream from the virion proteins (VP) promoter and the neomycin-resistance gene neo under the control of a simian virus 40 promoter. Cells transfected with this vector and selected for resistance to the neomycin derivative G418 synthesized RNA complementary to 2-5A synthetase mRNA. These cells lacked 2-5A synthetase activity, and the enzyme was not inducible by interferon. In contrast, 2-5A synthetase was induced in cells transfected with a control vector without the cDNA insert. Such cells were protected by interferon from RNA viruses, whereas cells lacking 2-5A synthetase were not protected from encephalomyocarditis virus, vesicular stomatitis virus, and Sindbis virus but were fully protected from influenza virus. These findings show that a high level of 2-5A synthetase is required for interferon-induced protection from the cytoplasmic RNA viruses tested.

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Selected References

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