Jaafar F.M., Attoui H., Mertens P.P.C., de Micco P., Lamballerie Xavier de. (2005). Structural organization of an encephalitic human isolate of Banna virus (genus Seadornavirus, family Reoviridae). Journal of General Virology, 86 Part 4, p. 1147-1157. ISSN 0022-1317.
Titre du document
Structural organization of an encephalitic human isolate of Banna virus (genus Seadornavirus, family Reoviridae)
Jaafar F.M., Attoui H., Mertens P.P.C., de Micco P., Lamballerie Xavier de
Source
Journal of General Virology, 2005,
86 Part 4, p. 1147-1157 ISSN 0022-1317
Banna virus (BAV) is the type species of the genus Seadornavirus within the family Reoviridae. The Chinese BAV isolate (BAV-Ch), which causes encephalitis in humans, was shown to have a structural organization and particle morphology reminiscent of that of rotaviruses, with fibre proteins projecting from the surface of the particle. Intact BAV-Ch virus particles contain seven structural proteins, two of which (VP4 and VP9) form the outer coat. The inner (core) particles contain five additional proteins (VP1, VP2, VP3, VP8 and VP10) and are 'non-turreted', with a relatively smooth surface appearance. VP2 is the 'T = 2' protein that forms the innermost 'subcore' layer, whilst VP8 is the 'T = 13' protein forming the core-surface layer. Sequence comparisons indicate that BAV VP9 and VP1 0 are equivalent to the VP8* and VP5* domains, respectively, of rotavirus outer-coat protein VP4 (GenBank accession no. P12976). VP9 has also been shown to be responsible for virus attachment to the host-cell surface and may be involved in internalization. These similarities reveal a previously unreported genetic link between the genera Rotavirus and Seadornavirus, although the expression of BAV VP9 and VP1 0 from two separate genome segments, rather than by the proteolytic cleavage of a single gene product (as seen in rotavirus VP4), suggests a significant evolutionary jump between the members of these two genera.
