. "Edited: D'Eustachio, P, 2008-06-13 14:03:50"^^ . "Reviewed: Jassal, B, 2008-06-13 14:05:49"^^ . "Authored: D'Eustachio, P, 2008-05-12 17:46:52"^^ . "In an ATP-dependent reaction, ATPA1 mediates the movement of intracellular phospholipid to the extracellular face of the plasma membrane. Cholesterol associated with cytosolic vesicles is a substrate for this reaction. Under physiologocal conditions, the active form of ABCA1 is predominantly a tetramer associated with apoA-I lipoprotein (Denis et al. 2004; Vedhachalam et al., 2007). The number of lipid molecules transported per ATP consumed is not known."^^ . . . . . . . "ABCA1-mediated transport of intracellular phospholipid to the cell surface"^^ . . . . . . .