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. 1991 Sep 15;88(18):7913–7917. doi: 10.1073/pnas.88.18.7913

Repression of the interferon signal transduction pathway by the adenovirus E1A oncogene.

M J Gutch 1, N C Reich 1
PMCID: PMC52415  PMID: 1654549

Abstract

The signal transduction pathway initiated by type I interferon (alpha and beta interferons) is inhibited by expression of the adenovirus type 5 E1A oncogene. Cotransfection analyses with the E1A oncogene and an interferon-stimulated reporter gene show that mutations within an amino-terminal domain of the E1A oncoprotein are defective in transcriptional repression. Cotransfection experiments also revealed that the transcriptional repression is mediated through the interferon-stimulated response element (ISRE) found within the promoter of interferon-stimulated genes. Since interferon treatment activates a latent cytoplasmic DNA-binding factor that can recognize the ISRE and subsequently stimulate transcription, the appearance of this factor was analyzed in a cell line that constitutively expresses the E1A oncogene. The DNA binding activity of this transcriptional activator was found to be inhibited in the E1A-expressing cell line. In vitro cytoplasmic mixing experiments with extracts from control and E1A-expressing cells identified a specific component of this multimeric transcription factor to be defective.

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