Abstract
Based on the DNA sequence and known mRNA structures, the early region 3 (E3) of bovine adenovirus (BAV)-3 has the potential to encode four proteins. One of them (121R) is produced as a 14.5-kD protein throughout infection. Analysis of the 121R protein showed limited homology to a 14.7K protein of human adenovirus (HAV)-5. Interestingly, both anti-14.7K and anti-121R sera immunoprecipitated a 14.5-kD protein from cells infected with BAV-3. To determine if 121R is functionally related to 14.7K, we constructed a recombinant E3-deleted HAV-5 (AdKV121) expressing the BAV-3 E3 121R protein. Mouse C3HA cells infected with HAV-5 mutant dl 758 (deletion of 14.7K) were sensitive to TNF lysis. However, wild-type HAV-5- or recombinant AdKV121-infected cells were resistant to TNF-induced cytolysis. Our result show that the BAV-3 E3 121R protein is serologically and functionally related to the 14.7K protein encoded by the E3 region of HAV-5.
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