Cell division protein that is required for the assembly of the Z ring (PubMed:16159787). May serve as a membrane anchor for the Z ring (By similarity). Binds and hydrolyzes ATP (PubMed:11298280). Also involved in sporulation (Probable). Homodimer (PubMed:11298280). Interacts with FtsZ (PubMed:16159787). Localizes to the Z ring in an FtsZ-dependent manner (PubMed:11298280). In sporulating cells, preferentially localizes to only one of the two potential polar division sites (PubMed:11298280). Targeted to the membrane through a conserved C-terminal amphipathic helix (By similarity). Transcription is controlled by three promoters. Two of these promoters, P1 and P3 are expressed mainly during vegetative growth. The third one, P2, is up-regulated around the onset of sporulation. In B.subtilis, unlike the situation in E.coli, the role of FtsA in the recruitment of other division proteins to the division site appears to be an indirect one, through ensuring that FtsZ forms a proper ring. Belongs to the FtsA/MreB family.