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Phospholipid-flipping activity of P4-ATPase drives membrane curvature.

EMBO J.2018 May 02;37(9). Epub 2018 Mar 29
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摘要


P4-ATPases are phospholipid flippases that translocate phospholipids from the exoplasmic/luminal to the cytoplasmic leaflet of biological membranes. All P4-ATPases in yeast and some in other organisms are required for membrane trafficking; therefore, changes in the transbilayer lipid composition induced by flippases are thought to be crucial for membrane deformation. However, it is poorly understood whether the phospholipid-flipping activity of P4-ATPases can promote membrane deformation. In this study, we assessed membrane deformation induced by flippase activity via monitoring the extent of membrane tubulation using a system that allows inducible recruitment of Bin/amphiphysin/Rvs (BAR) domains to the plasma membrane (PM). Enhanced phosphatidylcholine-flippase activity at the PM due to expression of ATP10A, a member of the P4-ATPase family, promoted membrane tubulation upon recruitment of BAR domains to the PM This is the important evidence that changes in the transbilayer lipid composition induced by P4-ATPases can deform biological membranes.

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