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. 1984 Jan;49(1):72–77. doi: 10.1128/jvi.49.1.72-77.1984

Mapping of the vaccinia virus DNA polymerase gene by marker rescue and cell-free translation of selected RNA.

E V Jones, B Moss
PMCID: PMC255426  PMID: 6690722

Abstract

The previous demonstration that a phosphonoacetate (PAA)-resistant (PAAr) vaccinia virus mutant synthesized an altered DNA polymerase provided the key to mapping this gene. Marker rescue was performed in cells infected with wild-type PAA-sensitive (PAAs) vaccinia by transfecting with calcium phosphate-precipitated DNA from a PAAr mutant virus. Formation of PAAr recombinants was measured by plaque assay in the presence of PAA. Of the 12 HindIII fragments cloned in plasmid or cosmid vectors, only fragment E conferred the PAAr phenotype. Successive subcloning of the 15-kilobase HindIII fragment E localized the marker within a 7.5-kilobase BamHI-HindIII fragment and then within a 2.9-kilobase EcoRI fragment. When the latter was digested with ClaI, marker rescue was not detected, suggesting that the PAAr mutation mapped near a ClaI site. The sensitive ClaI site was identified by cloning partial ClaI-EcoRI fragments and testing them in the marker rescue assay. The location of the DNA polymerase gene, about 57 kilobases from the left end of the genome, was confirmed by cell-free translation of mRNA selected by hybridization to plasmids containing regions of PAAr vaccinia DNA active in marker rescue. A 100,000-dalton polypeptide that comigrated with authentic DNA polymerase was synthesized. Correspondence of the in vitro translation product with purified vaccinia DNA polymerase was established by peptide mapping.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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