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Escherichia coli CRT4624-P2sig5 is a dnaA mutant in which integration of the prophage P2sig5 has occurred at the attP2II site (min 85). This strain was integratively suppressed, and when cells were shifted to 42 degrees C replication was initiated at a site in or near the P2 prophage. Initially, this replication occurred primarily in the direction that corresponds to the clockwise direction on the genetic map. Replication also occurred in the counterclockwise direction, but the initiation of replication in this direction occurred approximately 40 min later than the initiation of replication in the other direction. Because of this delay, the replication forks that traveled in the clockwise direction were the first to arrive in the region of the replication terminus. These replication forks ceased replication near the aroD locus (min 37), and it is proposed that the replication terminus is between the aroD and rac loci (min 31). A model is proposed for the cycle of chromosome replication in this strain at 42 degrees C.

Chromosome replication in an Escherichia coli dnaA mutant integratively suppressed by prophage P2