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Journal of Virology logoLink to Journal of Virology
. 1991 May;65(5):2655–2665. doi: 10.1128/jvi.65.5.2655-2665.1991

trans rescue of a mutant poliovirus RNA polymerase function.

W A Charini 1, C C Burns 1, E Ehrenfeld 1, B L Semler 1
PMCID: PMC240624  PMID: 1850039

Abstract

A series of three-nucleotide insertions was engineered into the P2 and P3 coding regions of the T7 expression plasmid pT7(tau)-PV1, which encodes a full-length copy of poliovirus type 1 (Mahoney) cDNA. When RNA derived in vitro from these mutated templates was used to transfect HeLa cells, viable virus mutants were recovered. One mutant, Sel-3D-18, which contained a single amino acid insertion in the 3Dpol coding region, was temperature sensitive for growth at 39 degrees C and showed defects in both RNA synthesis and P1 protein processing at the nonpermissive temperature. The RNA replication defect in Se1-3D-18 was identified at the level of RNA chain elongation. A highly specific and sensitive method was developed for analyzing the ability of mutant RNA templates to replicate in the presence or absence of helper functions provided in trans. This approach was used to demonstrate that RNA synthesis in Se1-3D-18 can be rescued by helper functions provided in trans.

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Selected References

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