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Papers In Press, published online ahead of print December 16, 2002
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Medical Sciences Program, Indiana University School of Medicine, Bloomington, IN 47405
Corresponding Author: daleked{at}indiana.edu
2 Abstract Lipids in biological membranes are asymmetrically distributed across the bilayer; the amine-containing phospholipids are enriched on the cytoplasmic surface of the plasma membrane, while the choline-containing and sphingolipids are enriched on the outer surface. The maintenance of transbilayer lipid asymmetry is essential for normal membrane function and disruption of this asymmetry is associated with cell activation or pathologic conditions. Lipid asymmetry is generated primarily by selective synthesis of lipids on one side of the membrane. Because passive lipid transbilayer diffusion is slow, a number of proteins have evolved to either dissipate or maintain this lipid gradient. These proteins fall into three classes: 1] cytofacially-directed, ATP-dependent transporters (“flippases”), 2] exofacially-directed, ATP-dependent transporters (“floppases”), and 3] bidirectional, ATP-independent transporters (“scramblases”). The flippase is highly selective for phosphatidylserine and functions to keep this lipid sequestered from the cell surface. Floppase activity has been associated with the ABC class of transmembrane transporters. Although they are primarily non-specific, at least two members of this class display selectivity for their substrate lipid. Scramblases are inherently non-specific and function to randomize the distribution of newly synthesized lipids in the endoplasmic reticulum or plasma membrane lipids in activated cells. It is the combined action of these proteins and the physical properties of the membrane bilayer that generate and maintain transbilayer lipid asymmetry.
Revised on December 10, 2002
Accepted on December 11, 2002
Regulation of transbilayer plasma membrane phospholipid asymmetry
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