Summary
1-Fluoro-2,4-dinitrobenzene (FDNB) has been used to study the availability of amino-containing phospholipids in erythrocyte membranes and ghosts in an aqueous, isotonic medium. It was found that the addition of bovine serum albumin (BSA) to the medium protects the cells from cation leak and protects some of the amino-phospholipids from reacting with the probe. In isotonic medium without BSA, 46% of the phosphatidylethanolamine and 12% of the phosphatidylserine of erythrocytes and 73% and 21% of these respective lipids of ghosts react with the probe. In the presence of 70 μm BSA, 31% of phosphatidylethanolamine and 6.5% of phosphatidylserine of erythrocytes and 59% and 16% of these respective lipids of ghosts react with the probe. The labeling of these lipids does not change under conditions of varying tonicity, or after treatment of erythrocytes with pronase or lysolecithin. The data suggest that 46% of phosphatidylethanolamine and 12% of phosphatidylserine of the erythrocyte membrane are free in a lipid bilayer; 27% and 9% of these respective lipids are loosely bound to proteins which are lost during the preparation of ghosts and 27% of the phosphatidylethanolamine and 79% of the phosphatidylserine are tightly bound to core proteins which remain part of the erythrocyte membrane even after hemolysis.
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Gordesky, S.E., Marinetti, G.V. & Segel, G.B. The interaction of 1-fluoro-2,4-dinitrobenzene with amino-phospholipids in membranes of intact erythrocytes, modified erythrocytes, and erythrocytes ghosts. J. Membrain Biol. 14, 229–242 (1973). https://doi.org/10.1007/BF01868080
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DOI: https://doi.org/10.1007/BF01868080