Journal of General Virology, Vol 78, 3135-3140, Copyright © 1997 by Society for General Microbiology

ARTICLES

Hypothesis on particle structure and assembly of rice dwarf phytoreovirus: interactions among multiple structural proteins

S Ueda, C Masuta and I Uyeda
Department of Agrobiology and Bioresources, Faculty of Agriculture, Hokkaido University, Sapporo, Japan.

To study the morphogenesis and packaging of rice dwarf phytoreovirus (RDV), the interactions among multiple structural proteins were analysed using both the yeast two-hybrid system and far-Western blotting analysis. The following protein-protein interactions were observed. P3 (major core protein) bound to itself as well as to P7 (nucleic acid-binding protein) and P8 (major outer capsid protein). P7 bound to P1 (RNA-dependent RNA polymerase) and P8, in addition to P3. Based on these findings, we hypothesize that the core shell structure is based on P3-P3 interactions and that P7 has the ability to bind to multiple structural proteins as well as to genomic RNAs during viral particle assembly. Based on the observed protein-protein interactions and on computer-aided analysis of the numbers of structural proteins per particle, possible RDV assembly events are proposed.

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