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We report the sequence of a Borna disease virus clone (pBDV-40) that encodes a 40-kDa protein (p40) found in the nuclei of infected cells. Comparative sequence analysis indicates that p40 is distantly similar to two different regions in the L-polymerase proteins encoded by paramyxoviruses and rhabdoviruses. The p40 sequence similarity indicates a previously undetected duplication in these viral polymerases. Phylogenetic reconstruction suggests that the gene that encodes p40 last shared a common ancestor with these viral polymerase genes prior to the duplication event. These findings support the hypothesis that Borna disease virus is a negative-strand RNA virus and suggest that p40 is involved in transcription and/or replication. The discovery of a duplication within the polymerase proteins of paramyxoviruses and rhabdoviruses has profound implications for the mapping of enzymatic activities within these multifunctional proteins.

Sequence similarity between Borna disease virus p40 and a duplicated domain within the paramyxovirus and rhabdovirus polymerase proteins