A DNA-binding protein that is part of the type III plasmid partition system used to ensure correct segregation of the pBc10987 plasmid (Probable). Binds TubZ filaments but does not influence the GTPase activity of TubZ with or without DNA (PubMed:22847006). Cooperatively binds to multiple regions in tubC (centromere-like site) upstream of its own gene with consensus sequence N(T/A)ATTNC(C/G)GNAAT(A/T)N; probably forms an extended DNA-protein filament. Binds sites in its own promoter region and presumably represses its expression; its effect on RNA expression has not been shown. Does not specifically bind to the putative origin of replication on pBc10987 (PubMed:30414406). Homodimer (PubMed:30414406). Binds to TubZ filaments via the C-terminus of TubZ. DNA is not required for binding to TubZ (PubMed:22847006). Probably part of the tubR-tubZ operon. Although this has the same function as TubR of B.thuringiensis subsp. israelensis there is little sequence homology and the dimerization interface is different. Increased expression of TubZ.