FtsK translocation on DNA stops at XerCD-dif

Nucleic Acids Res. 2010 Jan;38(1):72-81. doi: 10.1093/nar/gkp843. Epub 2009 Oct 23.

Abstract

Escherichia coli FtsK is a powerful, fast, double-stranded DNA translocase, which can strip proteins from DNA. FtsK acts in the late stages of chromosome segregation by facilitating sister chromosome unlinking at the division septum. KOPS-guided DNA translocation directs FtsK towards dif, located within the replication terminus region, ter, where FtsK activates XerCD site-specific recombination. Here we show that FtsK translocation stops specifically at XerCD-dif, thereby preventing removal of XerCD from dif and allowing activation of chromosome unlinking by recombination. Stoppage of translocation at XerCD-dif is accompanied by a reduction in FtsK ATPase and is not associated with FtsK dissociation from DNA. Specific stoppage at recombinase-DNA complexes does not require the FtsKgamma regulatory subdomain, which interacts with XerD, and is not dependent on either recombinase-mediated DNA cleavage activity, or the formation of synaptic complexes.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adenosine Triphosphatases / metabolism
  • Binding Sites
  • DNA / metabolism
  • DNA Cleavage
  • Escherichia coli Proteins / chemistry
  • Escherichia coli Proteins / metabolism*
  • Integrases / metabolism*
  • Membrane Proteins / chemistry
  • Membrane Proteins / metabolism*
  • Protein Structure, Tertiary
  • Protein Transport
  • Recombination, Genetic*

Substances

  • Escherichia coli Proteins
  • FtsK protein, E coli
  • Membrane Proteins
  • XerC protein, E coli
  • DNA
  • Cre recombinase
  • Integrases
  • XerD protein, E coli
  • Adenosine Triphosphatases