Component of the cell division machinery, which is probably involved in the stabilization of the divisome under certain stress conditions. Interacts with FtsL and several other divisomal proteins, including FtsI, FtsK, FtsN, FtsQ, FtsW and YmgF. Localizes to the division septum. Localization requires FtsQ and FtsN. The N-terminus is blocked. Inactivation increases the susceptibility of bacteria to a number of antibiotics that inhibit peptidoglycan biosynthesis. Increases the susceptibility to cycloserine, bacitracin, and a wide spectrum of beta-lactam antibiotics. Does not affect susceptibility to fosfomycin, valinomycin, tetracycline, chloramphenicol, gentamicin or quinolones.