Cell division protein that is part of the divisome complex and is recruited early to the Z-ring. Probably stimulates Z-ring formation, perhaps through the cross-linking of FtsZ protofilaments. Its function overlaps with FtsA (By similarity). Homodimer. Interacts with FtsZ (By similarity). Localizes to the division site, in a FtsZ-dependent manner. Belongs to the SepF family.