Based on sequence homology with human adenovirus 2 (HAdV2), the hexon gene of equine adenovirus 1 (EAdV1) was identified. Hind III restriction fragments containing the hexon and other viral genes were cloned into the plasmids pUC19 and pBlueScript SK(-) and sequenced. The nucleotide sequence of the hexon gene was completely determined and partial sequence data were obtained for seven other EAdV1 genes. Amino acid (aa) sequence comparison with published adenovirus (AdV) proteins identified the genes for the IIIa, penton, pVII, pVI, 23K proteinase, DNA binding and 100K proteins. The eight EAdV1 genes appeared to be in the same relative order as homologous genes of other AdV. The EAdV1 hexon protein was encoded the hexon-associated pVI upstream and the 23K proteinase gene downstream and comprised 2 742 nucleotides which translated into 913 aa. Similar to other members of the genus Mastadenovirus the EAdV1 hexon yielded two highly conserved genome segments at the N- and C-termini which flanked intermediate variable and hypervariable regions. The majority of the residue differences between EAdV1 and other AdV hexons occurred in two loops that are known for other AdV to protrude from the surface of the nucleocapsid. Amino acid comparisons with other AdV hexons revealed highest homology with HAdV12 hexon with 72% identical and 83% functionally similar residues, followed by bovine AdV3 hexon with 71% identities and 82% functional residue conservation. Phylogenetic analysis suggested that EAdV1 and other AdV do not have an immediate common ancestor.
Archives of Virology – Springer Journals
Published: Jun 1, 1997
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