Rainbow trout gonad cells (RTG-2) display a dramatic cytopathic effect and lysis following productive infection by infectious pancreatic necrosis virus (IPNV). In this study viruses were efficiently released into the growth medium together with low amounts of the monomeric free form of the structural protein VP3, heterodimers of VP2-VP3, aggregates of pVP2 and viral RNA associated with VP3. Ribonucleoprotein complexes of RNA-VP3 contained RNA equivalent to at the most 25% of full length viral genomes. Infectivity of material released into the growth medium late in infection was only associated with fully assembled viruses and isolated subviral RNA-VP3 complexes were not infectious. Upon purification of IPNV, viral hexa- and pentagonal particles of approx. 15 nm diameter were occasionally co-purified with the virus and then appeared in large quantities. Similar particle-like structures were seen as substructures of purified viruses that were treated with and partially disintegrated by CsCl of virus isodensity concentration.
Archives of Virology – Springer Journals
Published: Aug 1, 1999
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