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• W1994501082 endingPage "2223" @default.
• W1994501082 startingPage "2213" @default.
• W1994501082 abstract "ABSTRACT Recombinant simian virus 5 (rSV5) mutants containing substitutions in the M-F intergenic region were generated to determine the effect of increased readthrough transcription on the paramyxovirus growth cycle. We have previously shown, using an SV5 dicistronic minigenome, that replacement of the 22-base M-F intergenic region with a foreign sequence results in a template (Rep22) that directs very high levels of M-F readthrough transcription. An rSV5 containing the Rep22 substitution grew slower and to final titers that were 50- to 80-fold lower than those of wild-type (WT) rSV5. Cells infected with the Rep22 virus produced very low levels of monocistronic M and F mRNA, consistent with the M-F readthrough phenotype. Surprisingly, Rep22 virus-infected cells also displayed a global decrease in the accumulation of viral mRNA from genes located upstream and downstream of the M-F junction, and overall viral protein synthesis was reduced. Second-site revertants of the Rep22 virus that had regained WT transcription and growth properties contained a single base substitution that increased the M gene end U tract from four to eight residues, suggesting that the growth defects originated from higher-than-normal M-F readthrough transcription. Thus, the primary growth defect for the Rep22 virus appears to be in viral RNA synthesis and not in morphogenesis. A second rSV5 virus (G14), which contained a different foreign M-F intergenic sequence, grew to similar or slightly higher titers than WT rSV5 in some cell types and produced ∼1.5- to 2-fold more mRNA and viral protein. The data support the hypothesis that inhibition of Rep22 virus growth is due to increased access by the polymerase to the 5′ end of the genome and to the resulting overexpression of L protein. We propose that the elevated naturally occurring M-F readthrough which is characteristic of many paramyxoviruses serves as a mechanism to fine-tune the level of polymerase that is optimal for virus growth." @default.
• W1994501082 created "2016-06-24" @default.
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• W1994501082 creator A5041941691 @default.
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• W1994501082 date "2001-03-01" @default.
• W1994501082 modified "2023-09-27" @default.
• W1994501082 title "Increased Readthrough Transcription across the Simian Virus 5 M-F Gene Junction Leads to Growth Defects and a Global Inhibition of Viral mRNA Synthesis" @default.
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• W1994501082 doi "https://doi.org/10.1128/jvi.75.5.2213-2223.2001" @default.
• W1994501082 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/114805" @default.
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