title: Solubilization of the Semliki Forest virus membrane with sodium deoxycholate.
abstract: The effects of increasing concentrations of sodium deoxycholate on Semliki Forest have been studied. Sodium deoxycholate begins to bind to the virus at less than  0.1 mM free equilibrium concentration and causes lysis of the viral membrane at 0.9 +/- 0.1 mM free equilibrium concentration when 2.2 +/- 0.2 - 103 mol of sodium deoxycholate are bound per mol of virus. Liberation of proteins from the membrane begins at 1.5 +/- 0.1 mM sodium deoxycholate and the proteins released are virtually free from phospholipid above 2.0 mM sodium deoxycholate. The overall mechanism of sodium deoxycholate solubilization of the viral membrane resembles that of Triton X-100 and sodium dodecyl sulphate except that with sodium deoxycholate the various stages of membrane disruption occur at about 10-fold higher equilibrium free detergent concentrations. At sodium deoxycholate concentrations higher than 2.3 mM the viral spike glycoproteins can be separated by sucrose gradient centrifugation or gel filtration into constituent polypeptides E1, E2 and E3. E1 carries the haemagglutinating activity of the virus.
mesh_terms: D001665:Binding Sites; D003840:Deoxycholic Acid; D004591:Electrophoresis, Polyacrylamide Gel; D046911:Macromolecular Substances; D008566:Membranes / Q000648:ultrastructure*; D008854:Microscopy, Electron; D011092:Polyethylene Glycols; D011485:Protein Binding; D012672:Semliki forest virus / Q000648:ultrastructure*; D012995:Solubility; D014764:Viral Proteins
chemical_list: D046911:Macromolecular Substances; D014764:Viral Proteins; D003840:Deoxycholic Acid; D011092:Polyethylene Glycols