title: Microfluidic electrocapture-assisted mass spectrometry of membrane-associated polypeptides.
abstract: To isolate membrane-associated proteins, which play diverse structural, catalytic, and regulatory roles in cells, they are often initially solubilized in detergents. Although detergents are essential for purifying membrane proteins, they tend to interfere strongly with subsequent analyses. A microfluidic method is presented here that surmounts this problem, allowing well-resolved mass spectra of test membrane-associated polypeptides, and their complexes with ions and detergents, to be acquired. As a front-end module it allows access to other advanced mass spectrometric strategies to be utilized toward defining biomolecular interactions. This opens up a new avenue for studying complexation and analysis of membrane proteins of general importance.
authors.affiliation: Department of Analytical Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden.
authors.forename: Mohammadreza
authors.initials: M
authors.lastname: Shariatgorji
authors.forename: Juan
authors.initials: J
authors.lastname: Astorga-Wells
authors.forename: Hans
authors.initials: H
authors.lastname: Jornvall
authors.forename: Leopold L
authors.initials: LL
authors.lastname: Ilag
mesh_terms: D000595:Amino Acid Sequence; D003902:Detergents / Q000737:chemistry / Q000302:isolation & purification; D005960:Glucosides / Q000737:chemistry; D006096:Gramicidin / Q000737:chemistry / Q000302:isolation & purification; D013058:Mass Spectrometry / Q000379:methods*; D008565:Membrane Proteins / Q000737:chemistry / Q000302:isolation & purification*; D046210:Microfluidic Analytical Techniques / Q000379:methods*; D010455:Peptides / Q000737:chemistry / Q000302:isolation & purification*; D012995:Solubility
chemical_list: D003902:Detergents; D005960:Glucosides; D008565:Membrane Proteins; D010455:Peptides; D006096:Gramicidin; C018619:octyl-beta-D-glucoside