Catalytic component of a P4-ATPase flippase complex which catalyzes the hydrolysis of ATP coupled to the transport of aminophospholipids, phosphatidylserines (PS) and phosphatidylethanolamines (PE), from the outer to the inner leaflet of the plasma membrane (PubMed:25315773, PubMed:25947375, PubMed:26567335, PubMed:29799007, PubMed:30018401). Contributes to the maintenance of membrane lipid asymmetry with a specific role in morphogenesis of muscle cells. In myoblasts, mediates PS enrichment at the inner leaflet of plasma membrane, triggering PIEZO1-dependent Ca2+ influx and Rho GTPases signal transduction, subsequently leading to the assembly of cortical actomyosin fibers and myotube formation (PubMed:29799007). May be involved in the uptake of farnesyltransferase inhibitor drugs, such as lonafarnib. ATP + H2O + phospholipidSide 1 = ADP + phosphate + phospholipidSide 2. a 1,2-diacyl-sn-glycero-3-phospho-L-serine(out) + ATP + H2O = a 1,2-diacyl-sn-glycero-3-phospho-L-serine(in) + ADP + H(+) + phosphate a 1,2-diacyl-sn-glycero-3-phosphoethanolamine(out) + ATP + H2O = a 1,2-diacyl-sn-glycero-3-phosphoethanolamine(in) + ADP + H(+) + phosphate The flippase activity is inactivated by caspase-mediated cleavage in apoptotic cells, allowing for PS exposure on the cell surface and engulfment of apoptotic cells by macrophages. The ATPase activity is up-regulated by aminophospholipids PS and PE and down-regulated by increasing intracellular Ca2+ levels. Component of a P4-ATPase flippase complex which consists of a catalytic alpha subunit ATP11A and an accessory beta subunit TMEM30A. Efficient exit from the endoplasmic reticulum requires the presence of TMEM30A. Widely expressed (PubMed:26567335). Expressed in myoblasts (PubMed:29799007). Proteolytically cleaved by CASP3. Overexpression of ATP11A confers resistance to lonafarnib. Belongs to the cation transport ATPase (P-type) (TC 3.A.3) family. Type IV subfamily.