May play a role in a late step of replication. Protein level is high around the time of septum formation, but a basal protein level is present throughout the whole cell cycle. Transcription is regulated in a cell cycle-dependent manner, with maximal expression around the time of septum formation. Overexpression results in modifications of cell morphology from rods to extended rods. Belongs to the Sph1/Sph2 family.