Member of the two-component regulatory system MtrA/MtrB, responding to environmental signals (Probable). Controls expression of a number of genes including dnaA, ripA, fbpB and probably itself. Probably plays a role in cell division. Probably a monomer when inactive, phosphorylation may permit it to oligomerize (By similarity). The monomeric form does not seem to be phosphorylated. Phosphorylated by MtrB. Truncated N-terminus.