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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Nishimoto, I. Okamoto, T. |
| Description | Author Affiliation: Okamoto T ( Fourth Department of Internal Medicine, University of Tokyo School of Medicine, Japan.); |
| Abstract | The peptide Arg2410-Lys2423 (peptide 14) of the human insulin-like growth factor II/mannose 6-phosphate receptor directly activates Gi-2, a GTP-binding protein (G protein), and is responsible for Gi-2 activating function of the receptor. To characterize the basic mechanism of couplings between receptor stimulation and subunits of G proteins, we constructed a system consisting of peptide 14 and alpha and beta gamma subunits of Gi-2 in aqueous solution. Peptide 14 significantly increased the rate of guanosine 5'-[gamma-thio]triphosphate binding to isolated Gi-2 alpha from 0.50 +/- 0.03 (mean +/- SE; n = 3) to 0.75 +/- 0.02 mol per mol of Gi-2 alpha per 3 min (n = 3) at 100 microM. In this system, G beta gamma does dependently potentiated the peptide 14 action on Gi-2 alpha; and G beta gamma-induced potentiation reached saturation at a concentration comparable to that of Gi-2 alpha. An antibody specific for the C-terminal decapeptide of Gi-2 alpha reduce peptide 14-stimulated GDP release from Gi-2 to the basal level. This simplified system indicates that (i) the receptor sequence directly interacts with isolated Gi-2 alpha at its C-terminal region and (ii) G beta gamma potentiates the stimulation-G alpha coupling in a stoichiometrical manner for G alpha. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 18 |
| Volume Number | 88 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1991-10-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | GTP-Binding Proteins Metabolism Insulin-Like Growth Factor II Receptors, Cell Surface Animals In Vitro Techniques Macromolecular Substances Peptides Protein Binding Receptor, IGF Type 2 Chemistry Receptors, Somatomedin Signal Transduction Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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