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- W1596365682 abstract "To facilitate further studies of flavivirus transcription, cell extraction methods and in vitro reaction conditions which increased West Nile virus (WNV) RNA-dependent RNA polymerase activity were determined. Subcellular fractions from WNV-infected BHK-21/W12 cells were characterized with regard to their protein and RNA content and in vitro polymerase activity. In both a cytoplasmic fraction, designated S1, and a fraction enriched for outer nuclear membranes, designated S2, seven virus-specific proteins, NS5 (96 kilodaltons [kDa]), NS3 (67 kDa), E (48 kDa), NS1 (47 kDa), ns4a (26 kDa), ns2a (17 kDa), and ns2b (14.5 kDa), were detected. The fractions also contained virus-specific RNA and cellular rRNA and mRNA. Polymerase activity in S1 and S2 fractions from WNV-infected cells was concentrated by pelleting and consisted of two types of enzyme activities: the WNV RNA-dependent RNA polymerase and terminal transferases of cellular origin. Enhanced levels of WNV polymerase activity were obtained from these cell fractions by altering several of the in vitro reaction conditions. Although Mg2+ was the divalent cation preferred by WNV polymerase, virus-specific in vitro transcription was detected at reduced levels when Mn2+ (0.05 or 0.5 mM) was present as the sole divalent cation. Product analysis revealed that the viral polymerase incorporated radiolabeled ribonucleotides into three distinct RNA species. Free single-stranded genome-sized RNA which was LiCl insoluble and RNase sensitive was found by fingerprint analysis to have an oligonucleotide pattern similar to that of WNV genomic RNA. RNA molecules which comigrated as a broad band near the top of the gel were separable into LiCl-insoluble, partially RNase-sensitive replicative-intermediate RNA and LiCl-soluble, RNase-resistant replicative-form RNA. The cellular transferases added UMP or AMP residues to the 3'-termini of cellular mRNA, tRNA, and 18S and 28S rRNA. Although a cellular terminal transferase has been reported to function in initiation of poliovirus transcription, no labeling of the WNV RNA by either of these cellular enzymes was detected. Therefore, they appear to play no specific role in flavivirus RNA synthesis." @default.
- W1596365682 created "2016-06-24" @default.
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- W1596365682 date "1986-12-01" @default.
- W1596365682 modified "2023-10-17" @default.
- W1596365682 title "Characterization of West Nile virus RNA-dependent RNA polymerase and cellular terminal adenylyl and uridylyl transferases in cell-free extracts" @default.
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- W1596365682 doi "https://doi.org/10.1128/jvi.60.3.1113-1124.1986" @default.
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