PMID: 6972870May 1, 1981Paper

Asymmetric and symmetric membrane reconstitution by detergent elimination. Studies with Semliki-Forest-virus spike glycoprotein and penicillinase from the membrane of Bacillus licheniformis

European Journal of Biochemistry
A HeleniusK Simons

Abstract

The dissociation and reconstitution of the Semliki Forest virus membrane using the nonionic detergent octyl beta-D-glucoside was studied by sucrose density gradient centrifugation. The dissociation occurred in three stages: lysis at a free equilibrium octyl glucoside concentration of 14--18 mM, solubilization at 18--20 mM, and delipidation of the spike glycoproteins at the critical micellar concentration (22 mM) or higher. After solubilization the spike glycoproteins were present as soluble complexes with sedimentation coefficients of 19 S and 6 S. The 6-S form probably corresponded to a glycoprotein monomer complexed to detergent and the 19-S form consisted of oligomeric detergent-protein complexes. The two forms were in slow equilibrium with each other. When the soluble spike protein complexes and egg lecithin solubilized with octyl glucoside were mixed and the octyl glucoside concentration lowered either by dialysis or by dilution, reconstitution occurred. Three types of products were obtained: vesicles with 30% of the spike protein facing inwards and 70% facing outwards, vesicles with virtually all (95%) of the spike proteins pointing outwards, and small protein-rich soluble aggregates [Helenius et al. (1977) J. Cell Biol. ...Continue Reading

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Citations

Feb 1, 1991·The Journal of Membrane Biology·F Simon-PlasC Grignon
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