title: Cell-derived vesicles for single-molecule imaging of membrane proteins.
abstract: A new approach is presented for the application of single-molecule imaging to membrane receptors through the use of vesicles derived from cells expressing fluorescently labeled receptors. During the isolation of vesicles, receptors remain embedded in the membrane of the resultant vesicles, thus allowing these vesicles to serve as nanocontainers for single-molecule measurements. Cell-derived vesicles maintain the structural integrity of transmembrane receptors by keeping them in their physiological membrane. It was demonstrated that receptors isolated in these vesicles can be studied with solution-based fluorescence correlation spectroscopy (FCS) and can be isolated on a solid substrate for single-molecule studies. This technique was applied to determine the stoichiometry of α3β4 nicotinic receptors. The method provides the capability to extend single-molecule studies to previously inaccessible classes of receptors.
authors.affiliation: Department of Chemistry, University of Kentucky, 505 Rose Street, Lexington, KY 40506 (USA).
authors.forename: Faruk H
authors.initials: FH
authors.lastname: Moonschi
authors.forename: Amy K
authors.initials: AK
authors.lastname: Effinger
authors.forename: Xiaolu
authors.initials: X
authors.lastname: Zhang
authors.forename: William E
authors.initials: WE
authors.lastname: Martin
authors.forename: Ashley M
authors.initials: AM
authors.lastname: Fox
authors.forename: David K
authors.initials: DK
authors.lastname: Heidary
authors.forename: Jason E
authors.initials: JE
authors.lastname: DeRouchey
authors.forename: Christopher I
authors.initials: CI
authors.lastname: Richards
mesh_terms: D008565:Membrane Proteins / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods
chemical_list: D008565:Membrane Proteins
keywords: fluorescence correlation spectroscopy; fluorescence microscopy; single-molecule studies; transmembrane proteins; vesicles