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Topological entanglement between daughter chromosomes has to be reduced to exactly zero every time anE. coli cell divides. The enzymatic agents that accomplish this task are the topoisomerases.E. coli possesses four topoisomerases. It has been thought that topoisomerase IV is primarily responsible for unlinking the daughter chromosomes during DNA replication. We show here that topoisomerase III also plays a role in this process and is specifically localized to the replisome, the multiprotein machine that duplicates the cell’s genome, in order to do so.

Topoisomerase III Acts at the Replication Fork To Remove Precatenanes