title: Role for phospholipid flippase complex of ATP8A1 and CDC50A proteins in cell migration.
abstract: Type IV P-type ATPases (P4-ATPases) and CDC50 family proteins form a putative phospholipid flippase complex that mediates the translocation of aminophospholipids such as phosphatidylserine (PS) and phosphatidylethanolamine (PE) from the outer to inner leaflets of the plasma membrane. In Chinese hamster ovary (CHO) cells, at least eight members of P4-ATPases were identified, but only a single CDC50 family protein, CDC50A, was expressed. We demonstrated that CDC50A associated with and recruited P4-ATPase ATP8A1 to the plasma membrane. Overexpression of CDC50A induced extensive cell spreading and greatly enhanced cell migration. Depletion of either CDC50A or ATP8A1 caused a severe defect in the formation of membrane ruffles, thereby inhibiting cell migration. Analyses of phospholipid translocation at the plasma membrane revealed that the depletion of CDC50A inhibited the inward translocation of both PS and PE, whereas the depletion of ATP8A1 inhibited the translocation of PE but not that of PS, suggesting that the inward translocation of cell-surface PE is involved in cell migration. This hypothesis was further examined by using a PE-binding peptide and a mutant cell line with defective PE synthesis; either cell-surface immobilization of PE by the PE-binding peptide or reduction in the cell-surface content of PE inhibited the formation of membrane ruffles, causing a severe defect in cell migration. These results indicate that the phospholipid flippase complex of ATP8A1 and CDC50A plays a major role in cell migration and suggest that the flippase-mediated translocation of PE at the plasma membrane is involved in the formation of membrane ruffles to promote cell migration.
authors.affiliation: Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
authors.forename: Utako
authors.initials: U
authors.lastname: Kato
authors.forename: Hironori
authors.initials: H
authors.lastname: Inadome
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Yamamoto
authors.forename: Kazuo
authors.initials: K
authors.lastname: Emoto
authors.forename: Toshihide
authors.initials: T
authors.lastname: Kobayashi
authors.forename: Masato
authors.initials: M
authors.lastname: Umeda
mesh_terms: D000251:Adenosine Triphosphatases / Q000737:chemistry*; D000483:Alleles; D000818:Animals; D016466:CHO Cells; D002462:Cell Membrane / Q000378:metabolism; D002465:Cell Movement; D006224:Cricetinae; D005786:Gene Expression Regulation; D008051:Lipid Bilayers / Q000737:chemistry; D008563:Membrane Lipids / Q000737:chemistry; D008565:Membrane Proteins / Q000737:chemistry*; D010714:Phosphatidylethanolamines / Q000737:chemistry; D010718:Phosphatidylserines / Q000737:chemistry; D049294:Phospholipid Transfer Proteins / Q000737:chemistry*; D010743:Phospholipids / Q000737:chemistry*; D021381:Protein Transport
chemical_list: D008051:Lipid Bilayers; D008563:Membrane Lipids; D008565:Membrane Proteins; D010714:Phosphatidylethanolamines; D010718:Phosphatidylserines; D049294:Phospholipid Transfer Proteins; D010743:Phospholipids; C526978:TMEM30a protein, human; C483858:phosphatidylethanolamine; C580722:ATP8A1 protein, human; D000251:Adenosine Triphosphatases