Membrane phospholipid asymmetry in DMPC-induced human red cell vesicles.
Vesicles that do not contain spectrin were released from human erythrocytes by incubation with dimyristoylphosphatidylcholine. The transbilayer orientation of membrane phospholipids was subsequently determined by two independent methods. Incubation with phospholipase A2 revealed that the phospholipid asymmetry observed in red blood cells was essentially preserved in vesicles. By use of the prothrombinase assay a still highly asymmetric distribution of phosphatidylserine could be demonstrated in spite of its slightly increased exposure on the vesicle surface. These results show that membrane phospholipid asymmetry can be maintained in a system that does not contain an intact membrane skeleton or spectrin.
de Jong
K
K
Institut für Biochemie und Molekularbiologie, Bern, Switzerland.
Ott
P
P
D001514:Bee Venoms; D004134:Dimyristoylphosphatidylcholine / Q000494:pharmacology*; D004910:Erythrocyte Membrane / Q000187:drug effects / Q000378:metabolism / Q000648:ultrastructure*; D006801:Humans; D007700:Kinetics; D008563:Membrane Lipids / Q000378:metabolism; D010741:Phospholipases A / Q000378:metabolism / Q000494:pharmacology; D054467:Phospholipases A2; D010743:Phospholipids / Q000097:blood; D013925:Thromboplastin / Q000378:metabolism; D013997:Time Factors
D001514:Bee Venoms; D008563:Membrane Lipids; D010743:Phospholipids; D013925:Thromboplastin; D010741:Phospholipases A; D054467:Phospholipases A2; D004134:Dimyristoylphosphatidylcholine