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• W2152410272 abstract "The cytotoxicity of Semliki Forest virus (SFV) infection is caused partly by the non-structural protein nsP2, an essential component of the SFV replicase complex. Due to the presence of a nuclear localization signal (NLS), nsP2 also localizes in the nucleus of infected cells. The present study analysed recombinant SFV replicons and genomes with various deletions or substitutions in the NLS, or with a proline-to-glycine mutation at position 718 of nsP2 (P718G). Deletion of one or two arginine residues from the NLS or substitution of two of the arginines with aspartic acid resulted in a virus with a temperature-sensitive phenotype, and substitution of all three arginines was lethal. Thus, most of the introduced mutations severely affected nsP2 functioning in viral replication; in addition, they inhibited the ability of SFV to induce translational shut-off and kill infected cells. SFV replicons with a P718G mutation or replacement of the NLS residues 648 RRR 650 with RDD were found to be the least cytotoxic. Corresponding replicons expressed non-structural proteins at normal levels, but had severely reduced genomic RNA synthesis and were virtually unable to replicate and transcribe co-electroporated helper RNA. The non-cytotoxic phenotype was maintained in SFV full-length genomes harbouring the corresponding mutations; however, during a single cycle of cell culture, these were converted to a cytotoxic phenotype, probably due to the accumulation of compensatory mutations." @default.
• W2152410272 created "2016-06-24" @default.
• W2152410272 creator A5058385165 @default.
• W2152410272 creator A5082569959 @default.
• W2152410272 creator A5090821168 @default.
• W2152410272 date "2008-03-01" @default.
• W2152410272 modified "2023-10-02" @default.
• W2152410272 title "Mutations in the nuclear localization signal of nsP2 influencing RNA synthesis, protein expression and cytotoxicity of Semliki Forest virus" @default.
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• W2152410272 doi "https://doi.org/10.1099/vir.0.83320-0" @default.
• W2152410272 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2275301" @default.
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