title: KOPS: DNA motifs that control E. coli chromosome segregation by orienting the FtsK translocase.
abstract: Bacterial chromosomes are organized in replichores of opposite sequence polarity. This conserved feature suggests a role in chromosome dynamics. Indeed, sequence polarity controls resolution of chromosome dimers in Escherichia coli. Chromosome dimers form by homologous recombination between sister chromosomes. They are resolved by the combined action of two tyrosine recombinases, XerC and XerD, acting at a specific chromosomal site, dif, and a DNA translocase, FtsK, which is anchored at the division septum and sorts chromosomal DNA to daughter cells. Evidences suggest that DNA motifs oriented from the replication origin towards dif provide FtsK with the necessary information to faithfully distribute chromosomal DNA to either side of the septum, thereby bringing the dif sites together at the end of this process. However, the nature of the DNA motifs acting as FtsK orienting polar sequences (KOPS) was unknown. Using genetics, bioinformatics and biochemistry, we have identified a family of DNA motifs in the E. coli chromosome with KOPS activity.
authors.affiliation: LMGM, CNRS, 118, route de Narbonne, Toulouse, France.
authors.forename: Sarah
authors.initials: S
authors.lastname: Bigot
authors.forename: Omar A
authors.initials: OA
authors.lastname: Saleh
authors.forename: Christian
authors.initials: C
authors.lastname: Lesterlin
authors.forename: Carine
authors.initials: C
authors.lastname: Pages
authors.forename: Meriem
authors.initials: M
authors.lastname: El Karoui
authors.forename: Cynthia
authors.initials: C
authors.lastname: Dennis
authors.forename: Mikhail
authors.initials: M
authors.lastname: Grigoriev
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Allemand
authors.forename: François-Xavier
authors.initials: FX
authors.lastname: Barre
authors.forename: François
authors.initials: F
authors.lastname: Cornet
mesh_terms: D001665:Binding Sites; D020090:Chromosome Segregation / Q000235:genetics*; D002876:Chromosomes, Bacterial / Q000235:genetics*; D004269:DNA, Bacterial / Q000235:genetics / Q000378:metabolism*; D004926:Escherichia coli / Q000235:genetics / Q000502:physiology*; D029968:Escherichia coli Proteins / Q000378:metabolism*; D008565:Membrane Proteins / Q000378:metabolism*; D045522:Recombinases / Q000378:metabolism; D011995:Recombination, Genetic
chemical_list: D004269:DNA, Bacterial; D029968:Escherichia coli Proteins; C096452:FtsK protein, E coli; D008565:Membrane Proteins; D045522:Recombinases