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• W2073244562 endingPage "4091" @default.
• W2073244562 startingPage "4082" @default.
• W2073244562 abstract "The transfer kinetics of the neutral glycosphingolipid gangliotetraosylceramide (asialo-GM1) were investigated by monitoring tritiated asialo-GM1 movement from donor to acceptor vesicles. Two different methods were employed to separate donor and acceptor vesicles at desired time intervals. In one method, a negative charge was imparted to dipalmitoylphosphatidylcholine donor vesicles by including 10 mol% dipalmitoylphosphatidic acid. Donors were separated from neutral dipalmitoylphosphatidylcholine acceptor vesicles by ion-exchange chromatography. In the other method, small, unilamellar donor vesicles (20-nm diameter) and large, unilamellar acceptor vesicles (70-nm diameter) were coincubated at 45 degrees C and then separated at desired time intervals by molecular sieve chromatography. The majority of asialo-GM1 transfer to acceptor vesicles occurred as a slow first-order process with a half-time of about 24 days assuming that the relative concentration of asialo-GM1 in the phospholipid matrix was identical in each half of the donor bilayer and that no glycolipid flip-flop occurred. Asialo-GM1 net transfer was calculated relative to that of [14C]cholesteryl oleate, which served as a nontransferable marker in the donor vesicles. A nearly identical transfer half-time was obtained when the phospholipid matrix was changed from dipalmitoylphosphatidylcholine to palmitoyloleoylphosphatidylcholine. Varying the acceptor vesicle concentration did not significantly alter the asialo-GM1 transfer half-time. This result is consistent with a transfer mechanism involving diffusion of glycolipid through the aqueous phase rather than movement of glycolipid following formation of collisional complexes between donor and acceptor vesicles. When viewed within the context of other recent studies involving neutral glycosphingolipids, these findings provide additional evidence for the existence of microscopic, glycosphingolipid-enriched domains within the phospholipid bilayer." @default.
• W2073244562 created "2016-06-24" @default.
• W2073244562 creator A5011142378 @default.
• W2073244562 creator A5031949661 @default.
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• W2073244562 date "1985-07-01" @default.
• W2073244562 modified "2023-10-09" @default.
• W2073244562 title "Spontaneous transfer of gangliotetraosylceramide between phospholipid vesicles" @default.
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• W2073244562 doi "https://doi.org/10.1021/bi00336a042" @default.
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• W2073244562 hasPublicationYear "1985" @default.
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