Cell division protein that is required for growth during stress conditions. May be involved in protecting or stabilizing the divisomal assembly under conditions of stress. Localizes to the division septum. Localization requires FtsZ, FtsQ, FtsL and FtsN. Exported by the Tat system. The position of the signal peptide cleavage has been experimentally proven. Can also be exported by the Sec system. Cells lacking this gene are sensitive to oxidative stress and DNA damage at high temperature. They also exhibit filamentation. Is used as a model substrate in studies of the twin-arginine translocation (Tat) protein transport system. Belongs to the FtsP family.