In vitro DNA replication of recombinant plasmid DNAs containing the origin of progeny replicative form DNA synthesis of phage phi X174.


The origin of phage phi X174 progeny replicative form (RF) DNA synthesis has been inserted into the plasmid vector pBR322 and cloned. In direct contrast to pBR322, the recombinant superhelical plasmids can substitute for phi X174 RFI DNA as template in phi X174-specific reactions in vitro. We have shown that the recombinant plasmids: (i) are cleaved by the phi X174 A protein; (ii) support net synthesis of unit-length single-stranded circular DNA in the presence of the phi X174 A protein and Escherichia coli rep protein, DNA-binding protein, and DNA polymerase III elongation system; (iii) support replication of duplexes catalyzed by the phi X174 A protein and extracts of E. coli.




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