Activator of cell division through the inhibition of FtsZ GTPase activity, therefore promoting FtsZ assembly into bundles of protofilaments necessary for the formation of the division Z ring. It is recruited early at mid-cell but it is not essential for cell division (By similarity). Homodimer. Interacts with FtsZ (By similarity). Localizes at mid-cell. Belongs to the ZapA family. Type 1 subfamily.