Membrane isolation on polylysine-coated beads. Plasma membrane from HeLa cells.
HeLa cell plasma membranes have been purified after binding cells to polylysine-coated polyacrylamide beads. Cell attachment to beads and membrane recovery were maximal in a sucrose-acetate buffer, pH 5.0, at 25 degrees C. Measurements of ouabain-sensitive NaK-adenosine triphosphatase, membrane-bound 125I-wheat germ agglutinin, and chemical analyses showed that membranes on beads were of comparable or greater purity than membranes isolated by conventional methods. Because the isolation procedure is rapid (approximately 2.5 h), and produces membranes whose protoplasmic surfaces are fully exposed, it should be a useful supplement to standard isolation techniques.
D002452:Cell Count; D002458:Cell Fractionation / Q000379:methods*; D002462:Cell Membrane / Q000032:analysis / Q000648:ultrastructure; D004247:DNA; D006367:HeLa Cells; D006863:Hydrogen-Ion Concentration; D008563:Membrane Lipids / Q000032:analysis; D008565:Membrane Proteins / Q000032:analysis; D009994:Osmolar Concentration; D011107:Polylysine; D013696:Temperature
D008563:Membrane Lipids; D008565:Membrane Proteins; D011107:Polylysine; D004247:DNA