Topoisomerase IV tracks behind the replication fork and the SeqA complex during DNA replication in Escherichia coli
Emily Helgesen, Frank Sætre, Kirsten Skarstad
Abstract
Topoisomerase IV (TopoIV) is a vital bacterial enzyme which disentangles newly replicated DNA and enables segregation of daughter chromosomes. In bacteria, DNA replication and segregation are concurrent processes. This means that TopoIV must continually remove inter-DNA linkages during replication. There exists a short time lag of about 10-20 min between replication and segregation in which the daughter chromosomes are intertwined. Exactly where TopoIV binds during the cell cycle has been the subject of much debate. We show here that TopoIV localizes to the origin proximal side of the fork trailing protein SeqA and follows the movement pattern of the replication machinery in the cell.
Topics & Concepts
SeqA protein domainDNA replicationBiologyReplication (statistics)TopoisomeraseDNAControl of chromosome duplicationOrigin recognition complexGeneticsCell divisionEukaryotic DNA replicationCell biologyReplication factor CMinichromosome maintenanceOrigin of replicationCircular bacterial chromosomeTer proteinFork (system call)CellVirologyComputer scienceOperating systemCancer therapeutics and mechanismsDNA Repair MechanismsAntibiotic Resistance in Bacteria