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Poxviruses appear to use single-strand annealing reactions to recombine linear molecules sharing short (<20 bp) regions of end homology. We have examined the effect of base mismatches and base insertions on the reaction efficiency and used mismatch-containing DNAs to further characterize the polarity of the exonuclease postulated to catalyze these reactions in vivo. Incorporating one or two base...
During poxvirus infection, both viral genomes and transfected DNAs are converted into high-molecular-weight concatemers by the replicative machinery. However, aside from the fact that concatemer formation coincides with viral replication, the mechanism and protein(s) catalyzing the reaction are unknown. Here we show that vaccinia virus DNA polymerase can catalyze single-stranded annealing reactions...
We have examined the effects of transcription on recombination frequencies in poxvirus-infected cells. A synthetic poxviral promoter was shown to function as a hybrid early/late transcription element when fused to a luciferase reporter gene, and then cloned into genetically-marked recombination substrates. These lambda DNA substrates were transfected into cells infected with Shope fibroma virus...
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