Abstract
Proteins from herpes simplex virus (HSV)-infected cells were used to reconstitute DNA synthesis in vitro on a preformed replication fork. The preformed replication fork consisted of a nicked, double-stranded, circular DNA molecule with a 5' single-strand tail that was noncomplementary to the template. The products of DNA synthesis on this substrate were rolling-circle molecules, as demonstrated by electron microscopy and alkaline agarose gel electrophoresis. The tails contained double-stranded regions, indicating that both leading- and lagging-strand DNA syntheses occurred. Rolling-circle DNA replication was dependent upon HSV DNA polymerase and ATP and was stimulated by a crude fraction containing ICP8 (HSV DNA-binding protein). Similar protein fractions from mock-infected cells were unable to support rolling-circle DNA replication. This in vitro DNA replication system should prove useful in the identification and characterization of the enzymatic activities required at the HSV replication fork.
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