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. 1989 Nov 25;17(22):9039–9050. doi: 10.1093/nar/17.22.9039

Vaccinia virus encodes a polypeptide with DNA ligase activity.

S M Kerr 1, G L Smith 1
PMCID: PMC335112  PMID: 2587253

Abstract

Vaccinia virus gene SalF 15R potentially encodes a polypeptide of 63 kD which shares 30% amino acid identity with S. pombe and S. cerevisiae DNA ligases. DNA ligase proteins can be identified by incubation with alpha-(32P)ATP, resulting in the formation of a covalent DNA ligase-AMP adduct, an intermediate in the enzyme reaction. A novel radio-labelled polypeptide of approximately 61 kD appears in extracts from vaccinia virus infected cells after incubation with alpha-(32P)ATP. This protein is present throughout infection and is a DNA ligase as the radioactivity is discharged in the presence of either DNA substrate or pyrophosphate. DNA ligase assays show an increase in enzyme activity in cell extracts after vaccinia virus infection. A rabbit antiserum, raised against a bacterial fusion protein of beta-galactosidase and a portion of SalF 15R, immune-precipitates polypeptides of 61 and 54 kD from extracts of vaccinia virus-infected cells. This antiserum also immune-precipitates the novel DNA ligase-AMP adduct, thus proving that the observed DNA ligase is encoded by SalF 15R.

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Selected References

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