Probably involved in chromosome partitioning. Binds to a plasmid centromere-like site parS. Stimulates the ATPase activity 10-fold of Soj; the first 20 residues may be responsible. Homodimer, probably via the C-terminal 46 residues. Dimerization of the N-terminal H-T-H region may require DNA-binding. Probably interacts with ATPase Soj. Belongs to the ParB family.