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The DNA sequence of the early E3 transcription unit of adenovirus 2 (Ad2) (J. Hérissé et al., Nucleic Acids Res. 8:2173-2192, 1980), indicates that an open reading frame exists between nucleotides 1860 and 2163 that could encode a protein of Mr 11,600 (11.6K). We have determined the DNA sequence of the corresponding region in Ad5 (closely related to Ad2) and have established that this putative gene is conserved in Ad5 (a 10.5K protein). To determine whether this protein is expressed, we prepared an antiserum in rabbits against a synthetic peptide corresponding to amino acids 66 to 74 in the 11.6K protein of Ad2. The peptide antiserum immunoprecipitated a ca. 13K-14K protein doublet, as estimated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, from [35S]methionine-labeled Ad2- or Ad5-early-infected KB cells. The antiserum also immunoprecipitated a 13K-14K protein doublet translated in vitro from Ad2 or Ad5 early E3-specific mRNA purified by hybridization to Ad2 EcoRI-D (nucleotides -236 to 2437). The synthetic peptide successfully competed with the 13K-14K protein doublet in immunoprecipitation experiments, thereby confirming the specificity of the antiserum. As deduced from the DNA sequence, the 11.6K protein (and the corresponding 10.5K Ad5 protein) has a conserved 22-amino-acid hydrophobic domain, suggesting that the protein may be associated with membranes. We conclude that a gene located at nucleotides 1860 to 2143 in the Ad2 E3 transcription unit (nucleotides 1924 to 2203) in the Ad5 E3 transcription unit) encodes an 11.6K protein (10.5K in Ad5).

Mapping a new gene that encodes an 11,600-molecular-weight protein in the E3 transcription unit of adenovirus 2