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Expression of the human erythrocyte glucose transporter in Escherichia coli.
Proceedings of the National Academy of Sciences of the United States of America
The gene encoding the human erythrocyte glucose transporter, cloned from HepG2 hepatoma cells, was expressed in Escherichia coli by introducing a prokaryote-type ribosome binding site, subcloning the gene into the T7 promoter/T7 polymerase expression system, and transforming a strain that is defective in glucose transport. Cells bearing plasmids with the transporter gene take up 2-deoxy-D-glucose and D-glucose, unlike cells bearing plasmids without the transporter gene. Moreover, 2-deoxy-D-glucose uptake is inhibited by unlabeled D-glucose, cytochalasin B, or mercuric chloride but not by L-glucose. The glucose transport protein is inserted into the membrane of E. coli, as evidenced by immunoblotting experiments with two site-directed polyclonal antibodies, one directed against the COOH terminus of the glucose transporter and the other directed against a synthetic peptide containing amino acid residues 225-238. As detected with both antibodies, the protein migrates with apparent molecular mass of 34 kDa in sodium dodecyl sulfate/12% polyacrylamide, a size similar to that of the unglycosylated glucose-transport protein synthesized in vitro.
Base Sequence, Carcinoma, Hepatocellular, Cloning, Molecular, Cytochalasin B, Deoxyglucose, Electrophoresis, Polyacrylamide Gel, Erythrocytes, Escherichia coli, Gene Expression Regulation, Glucose, Humans, Immunoassay, Liver Neoplasms, Mercuric Chloride, Molecular Sequence Data, Monosaccharide Transport Proteins, Plasmids, Tumor Cells, Cultured
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