May function as a DNA motor that moves dsDNA in an ATP-dependent manner towards the dif recombination site, which is located within the replication terminus region. Translocation stops specifically at Xer-dif sites, where FtsK interacts with the Xer recombinase, allowing activation of chromosome unlinking by recombination. FtsK orienting polar sequences (KOPS) guide the direction of DNA translocation. FtsK can remove proteins from DNA as it translocates, but translocation stops specifically at XerCD-dif site, thereby preventing removal of XerC and XerD from dif (By similarity). Homohexamer. Forms a ring that surrounds DNA (By similarity). Although strongly related to FtsK, it lacks the typical transmembrane domains located at the N-terminal part of FtsK. Belongs to the FtsK/SpoIIIE/SftA family.