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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Kurokawa, T. Chen, C. C. Isselbacher, K. J. Tillotson, L. G. |
| Abstract | The D-glucose transporter in the human erythrocyte membranes was photoaffinity-labeled with [3H]cytochalasin B and solubilized with n-octyl beta-D-glucopyranoside (octyl glucoside). [3H]Cytochalasin B-bound proteins were further isolated by using Sephadex G-50 chromatography. The amount of [3H]cytochalasin B associated with the membrane proteins was approximately 10% of the total radioactivity in the octyl glucoside extract. The solubilized photoaffinity-labeled D-glucose transporter was isolated and found to consist of two major peaks by DEAE-Sephacel chromatography. The radioactivity of peak II was considerably greater than that of peak I. The incorporation of [3H]cytochalasin B into both peaks was blocked by the presence of D-glucose during photolysis. With preparative NaDod-SO4/polyacrylamide gel electrophoresis, the radioactivity of peak I could be released, but that of peak II remained with the D-glucose transporter. These results indicate that [3H]cytochalasin B was covalently bound to the D-glucose transporter only in peak II and that peak II could be generated by the photoaffinity labeling of peak I. However, the D-glucose transport activity was associated only with peak I. These findings suggest that the anionic domain of the D-glucose transporter becomes exposed because of conformational changes of the protein as a result of covalent binding with [3H]cytochalasin B by photoaffinity labeling. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 2 |
| Volume Number | 83 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1986-02-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cytochalasin B Erythrocyte Membrane Monosaccharide Transport Proteins Isolation & Purification Affinity Labels Photochemistry Solubility Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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