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A cell-free extract prepared from phi X174-infected Escherichia coli cells sustained in vitro synthesis of viral DNA (stage III reaction) when supplemented with fraction II from uninfected cells. The reaction was dependent upon deoxyribonucleoside triphosphate, ATP, added phi X174 replicative form I DNA template, and the fraction II from uninfected cells. This reaction differed from the stage II reaction (semiconservative replication of duplex replicative form DNA) by the production of stable viral protein-DNA complexes sensitive to anti-phi X174 antiserum. Three types of protein-DNA complexes were identified, 50S, 92S, and a 114S complex that cobanded in CsCl and cosedimented in neutral sucrose gradients with a phi X174 phage marker. The sensitivity of these complexes to anti-phi X174 antiserum and Staphylococcus aureus provided a relatively rapid biochemical assay for direct measurement of the amount of DNA synthesized by the stage III reaction. With this assay, an E. coli factor (SIII) required specifically for the synthesis of viral protein-DNA complexes was identified and purified 200-fold from uninfected E. coli cells. The partially purified SIII factor was required for the synthesis of DNA and viral protein-DNA complexes in the phi X174-infected cell extracts and could not be replaced by rep protein, single-strand binding protein, or DNA polymerase III holoenzyme.

Escherichia coli host factor required specifically for the phi X174 stage III reaction: in vitro identification and partial purification.