Reconstitution of D-glucose transport in vesicles composed of lipids and intrinsic protein (zone 4.5) of the human erythrocyte membrane

Journal of Supramolecular Structure
A Kahlenberg, C A Zala

Abstract

Elucidation of the mechanism of facilitated D-glucose transport in human erythrocytes is dependent on the identification and isolation of the membrane protein(s) mediating this process. Based on the fact that stereospecific D-glucose transport is reconstituted in liposomes prepared by sonication of a lipid suspension with ghosts or fractions derived from ghosts, a quantitative assay for the stereospecific D-glucose transport activity of these fractions was developed (Zala CA, Kahlenberg A: Biochem Biophys Res Commun 72:866, 1976). This assay was used to monitor the purification of ghosts. The solubilized membrane protein fraction was chromatographed on a column of diethylaminoethyl cellulose which was eluted stepwise with NaCl-phosphate buffers of increasing ionic strength. A fraction, eluted at an ionic strength of 0.1, displayed a 13- and 27-fold increase in reconstituted transport activity relative to ghosts and to the unfractionated Triton X-100 extract, respectively. This fraction, when analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, consisted predominantly of the ghost proteins with an apparent molecular weight of 55,000, commonly designated as zone 4.5; periodic acid-Schiff-sensitive membrane glyco...Continue Reading

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