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Enrichment of the plasma membrane represents one valuable method to characterize the surfaceome, along with other plasma membrane and structural proteins. Currently, the overlapping densities of many subcellular organelles hinder enrichment of the plasma membrane by centrifugation. However, external access to the plasma membrane of intact cells allows the attachment of a nanoparticle pellicle to enhance its density and facilitate enrichment. We describe the synthesis of iron oxide nanoparticles, attachment of the pellicle to suspended cells, and recovery of plasma membrane proteins for proteomic analysis.

Application of Higher Density Iron Oxide Nanoparticle Pellicles to Enrich the Plasma Membrane and Its Proteome from Cells in Suspension