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. 1988 May;62(5):1687–1696. doi: 10.1128/jvi.62.5.1687-1696.1988

Construction and characterization of poliovirus subgenomic replicons.

G Kaplan 1, V R Racaniello 1
PMCID: PMC253202  PMID: 2833619

Abstract

Poliovirus RNAs containing in-frame deletions within the capsid-coding region were produced by in vitro transcription of altered poliovirus type 1 cDNA by using bacteriophage T7 RNA polymerase. Three RNAs were transcribed that contained deletions of 2,317 nucleotides (bases 747 to 3064), 1,781 nucleotides (bases 1,175 to 2,956), and 1,295 nucleotides (bases 1,175 to 2,470). All three subgenomic RNAs replicated after transfection into HeLa cells, demonstrating that sequences encoding the capsid polypeptides are not essential for viral RNA replication in vivo. Viral RNA containing the largest deletion (R1) replicated approximately three times better than full-length RNA produced in vitro. Northern blot (RNA blot) hybridization analysis of total cellular RNA from HeLa cells at different times after transfection with R1 demonstrated the presence of increasing amounts of the expected 5.1-kilobase subgenomic RNA. Analysis by immunoprecipitation of viral proteins induced after transfection of R1 RNA into HeLa cells revealed the presence of proteins 2Apro, 2C, and 3Dpol and its precursors, suggesting that the polyprotein cleavages are similar to those occurring in virus-infected cells. Replication of P2/Lansing virion RNA was inhibited by cotransfection with the R1 replicon, as demonstrated by hybridization analysis with a serotype-specific oligonucleotide probe. A higher level of inhibition of RNA replication was observed when P2/Lansing RNA was cotransfected into HeLa cells with truncated R1 transcripts (R1-PvuII) that were missing 395 3' nucleotides and a poly(A) tail. These internally and terminally deleted RNAs inhibited the replication of subgenomic replicons R1, R2, and R3 and caused a reduction in plaque size when cotransfected with P1/Mahoney or P2/Lansing viral RNA, suggesting that individual cells had received both RNAs. No inhibition of plaque size was observed when replicon RNAs were used that were missing 1,384 or 1,839 3' nucleotides or contained plasmid-derived sequences downstream of the 3' poly(A). The trans-acting inhibitory effect of R1-PvuII on the replication of poliovirus P2/Lansing RNA did not involve entry of RNA into cells and appeared to reduce viral translation and RNA synthesis late in the infection cycle.

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Selected References

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