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We efficiently expressed, in Escherichia coli, and purified the protein product encoded by the human adenovirus type 12 (Ad12) 13S mRNA. The functional properties of the E1A protein were analyzed by introducing the protein by microinjection or protoplast fusion into living mammalian cells. We showed that the E. coli-expressed E1A protein induces gene expression of the adenovirus type 5 (Ad5) E1A deletion mutant Ad5dl312. The purified E1A protein rapidly and quantitatively localized to the cell nucleus after microinjection into the cytoplasm. In addition, we raised high-titered monospecific antibodies to the purified Ad12 E1A protein. Using deleted forms of an adenovirus type 2 and Ad5 hybrid (Ad2/5) E1A protein, we showed that all of the epitopes conserved between Ad2/5 E1A and Ad12 E1A protein that are recognized by the Ad12 E1A-specific antiserum map to within the first exon-encoded amino-terminal half of the protein.

Adenovirus type 12 E1A protein expressed in Escherichia coli is functional upon transfer by microinjection or protoplast fusion into mammalian cells