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Borna disease virus (BDV) is an enveloped virus with a non-segmented, negative-strand RNA genome that has an organization characteristic of Mononegavirales. However, based on its unique genetics and biological features BDV is considered to be the prototypic member of a new virus family, Bornaviridae. Here, the use of a reverse genetic approach to identify the viral proteins required for packaging of BDV RNA analogues (MG) into infectious virus-like particles (VLPs) was described. Plasmids encoding individual BDV proteins under the control of a RNA polymerase II promoter were co-transfected with a plasmid that allows for intracellular synthesis of a BDV MG mediated by the cellular RNA polymerase I. Clarified lysates from transfected cells were passaged onto fresh cells that were previously transfected with plasmids expressing the minimal BDV trans-acting factors L, N and P required for RNA synthesis mediated by the BDV polymerase. Reconstitution of BDV MG-specific packaging and passage of infectious VLP was monitored by expression of the chloramphenicol acetyl transferase reporter gene present in the BDV MG. BDV M and G, in addition to L, N and P, were sufficient for the passage of chloramphenicol acetyl transferase activity, which could be blocked by BDV neutralizing antibodies to G, indicating that VLP infectivity was fully mediated by BDV G. Passage of BDV MG was abrogated by omission of either M or G.

Identification of the Borna disease virus (BDV) proteins required for the formation of BDV-like particles