Abstract
The gene encoding the major capsid protein (MCP) VP5 of herpesvirus of turkeys (HVT) was identified and sequenced. It has a single open reading frame of 4236 nucleotides encoding 1412 aa protein. The gene is flanked by VP23 and UL20 sequences and is localized in the unique long region (UL) within the BamHI-B fragment. Comparison of amino acid homology has shown its clear position among the alpha-herpesviruses rather than beta- or gamma-herpesviruses. The VP5 is expressed from polycistronic mRNA together with the UL20 and the VP23 genes. The 7,2 kb RNA transcript is lacking any promoter elements or polyA signal in intergenomic regions between VP5 and UL20 or VP5 and VP23 genes, respectively. Multiple alignment of known major capsid protein sequences of all herpesvirus groups revealed presence of seven highly homologous clusters suggesting-that the corresponding protein domains might play an important role in folding of MCP and assembly of herpesvirus capsid.
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