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- W1487448001 abstract "Nodamura virus (NOV) was purified from the hind limbs of infected suckling mice and used as a source of the two genomic RNAs of the virus, RNA 1 and RNA 2. Upon transfection of the viral RNAs into baby hamster kidney (BHK21) cells in culture, vigorous RNA replication ensued and single-stranded RNAs 1 and 2 accumulated to reach an abundance which approximated that of the cellular rRNAs. Transient synthesis of a small subgenomic RNA (RNA 3) was also observed, and double-stranded versions of RNAs 1, 2, and 3 were detected. Three major viral proteins were synthesized in transfected cells. Protein A (about 115 kDa) and protein B (about 15 kDa) were made transiently at early times after transfection, whereas a large amount of protein alpha (43 kDa), the precursor to the two viral coat proteins, was made continuously starting later in the infectious cycle. When very low concentrations of viral RNAs were used for transfection, preferential replication of RNA 1 occurred. This result was attributed to segregation of the transfected viral RNAs to separate cells in culture and the subsequent replication and amplification of RNA 1 in cells that had received no RNA 2. Accordingly, multiple passages of the viral RNAs by transfection at the limit dilution resulted in the purification of RNA 1 free of RNA 2 and demonstrated that RNA 1 was capable of prolonged autonomous replication which was also accompanied by the continuous synthesis of RNA 3. In cells transfected with RNA 1 alone, protein alpha was not synthesized and proteins A and B were made continuously. Electron microscopic analysis of BHK21 cells 24 h after transfection with NOV RNAs 1 and 2 showed that large numbers of virus particles accumulated in the cytoplasm and formed paracrystalline arrays in some regions. Whole NOV purified from transfected BHK21 cells was infectious for suckling mice and had an electrophoretic mobility that was similar but not identical to that of NOV purified from infected mouse muscle. The high yield of NOV, its simple genetic composition, and its unusual genome strategy make this virus an attractive system for the study of viral RNA replication in animal cells." @default.
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- W1487448001 date "1992-04-01" @default.
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- W1487448001 title "Replication of nodamura virus after transfection of viral RNA into mammalian cells in culture" @default.
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- W1487448001 doi "https://doi.org/10.1128/jvi.66.4.2326-2334.1992" @default.
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