Component of a P4-ATPase flippase complex which catalyzes the hydrolysis of ATP coupled to the transport of aminophospholipids from the outer to the inner leaflet of various membranes and ensures the maintenance of asymmetric distribution of phospholipids. Phospholipid translocation seems also to be implicated in vesicle formation and in uptake of lipid signaling molecules (Probable). ATP + H2O + phospholipidSide 1 = ADP + phosphate + phospholipidSide 2. Component of a P4-ATPase flippase complex which consists of a catalytic alpha subunit and an accessory beta subunit (Probable). Interacts with beta subunits TMEM30A and TMEM30B. Ubiquitously expressed at moderate levels. Belongs to the cation transport ATPase (P-type) (TC 3.A.3) family. Type IV subfamily. Contaminating sequence. Sequence of unknown origin inserted in the coding sequence.