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Lysates of Escherichia coli exhibit a DNA-synthesizing activity that depends on the presence of replication forks and of replication proteins. Replicative activity was reconstituted in vitro by mixing lysates prepared from temperature-sensitive dnaB mutants with wild-type dnaB protein. Lysates of double mutants deficient in both dnaB and dnaC genes could only be complemented by the addition of both dnaB and dnaC proteins, whereas lysates deficient in dnaC protein did not require the addition of any exogenous factor. This shows that the replication machinery, once it is running along the chromosome, is independent of dnaC protein, dnaC activity, however, is required for the replacement of defective dnaB protein at running replication forks.

dnaC-dependent reconstitution of replication forks in Escherichia coli lysates