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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Valentine-braun, K. A. Northup, J. K. Hollenberg, M. D. |
| Abstract | We have identified a component of about 35 kDa (pp35), present in human placental membrane preparations, that is a substrate for epidermal growth factor (urogastrone) [EGF(Uro)]-mediated phosphorylation. The EGF(Uro)-stimulated phosphorylation of pp35 was calcium-dependent and was markedly enhanced in membranes prepared in the presence (but not in the absence) of calcium. The phosphate incorporated into pp35 in the presence of EGF(Uro) was alkali-stable and was present as O4-phosphotyrosine. Under identical conditions, insulin did not stimulate pp35 phosphorylation. Either in its native or in its phosphorylated form, pp35 could be released from the membranes in the presence of calcium-chelating agents (EDTA/EGTA); and EGF(Uro)-stimulated phosphorylation was reconstituted by adding back EDTA/EGTA eluates to EDTA/EGTA-washed membranes in the presence of calcium. The properties of pp35 were similar if not identical to those of beta-35, a 35-kDa polypeptide similar to the beta subunit of the guanine nucleotide-binding oligomers that stimulate (Gs) or inhibit (Gi) the adenylate cyclase system. As with pp35, EGF(Uro)-stimulated phosphorylation of isolated rabbit liver beta-35 was observed in a reconstituted system using either EDTA/EGTA-washed placental membranes or solubilized EGF(Uro) receptor immobilized on concanavalin A-agarose. In contrast, the addition of beta subunits derived from rabbit liver Gi or bovine transducin did not result in phosphorylation of a 35-kDa substrate in the reconstituted system. Further, a 35-kDa protein released from placental membranes crossreacted with an anti-transducin antibody that can recognize the beta subunit isolated from a variety of sources. We conclude that the human placental pp35 substrate likely represents the placental equivalent of the beta-35 protein. Our data point to a possible link between those receptors involved in growth-factor action and the regulatory systems that utilize GTP-binding proteins as transducing elements. |
| 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 | Epidermal Growth Factor Metabolism GTP-Binding Proteins Membrane Proteins Placenta Calcium Physiology Macromolecular Substances Molecular Weight Phosphoproteins Phosphorylation Pregnancy Protein-Tyrosine Kinases Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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