Transactivation of a bovine papilloma virus transcriptional regulatory element by the E2 gene product - PubMed (original) (raw)

Transactivation of a bovine papilloma virus transcriptional regulatory element by the E2 gene product

B A Spalholz et al. Cell. 1985 Aug.

Abstract

We have mapped a transcriptional regulatory sequence within the 1.0 kb noncoding region of the bovine papilloma virus (BPV-1) genome, using an enhancer dependent expression vector for chloramphenicol acetyltransferase. This transcriptional regulatory element works independently of position and orientation, and its function is significantly augmented in BPV-1 transformed C127 cells and in monkey CV-1 cells acutely transfected with plasmids expressing BPV-1 early gene products. Using defined deletion mutants of the BPV-1 DNA and full-length viral cDNAs expressed from an SV40 early promoter, we demonstrate that the expression of this trans-activating factor maps to the 3' open reading frames of the viral transforming region. A premature termination codon engineered into the E2 ORF eliminates expression of this diffusible transactivation function establishing the E2 gene product as the diffusible trans-activating factor.

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