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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Manne, V. Kung, H. F. Tsai, S. C. Vaughan, M. Adamik, R. Moss, J. |
| Abstract | The Ha-ras protooncogene product p21, which may be involved in control of cellular growth, is a membrane protein that binds guanine nucleotides and hydrolyzes GTP. p21 GTPase activity is stimulated by lysophosphatidylcholine; a delay in activation was observed unless p21 was incubated with the phospholipid prior to assay. Maximal activation by the phospholipid was observed over a narrow concentration range; the presence in the assay mixture of lysophosphatidylcholine at concentrations above this optimum markedly inhibited p21 GTPase. GTP hydrolysis was also stimulated, but to a lesser degree, by phosphatidylcholine. Phosphatidylinositol and phosphatidylserine did not significantly enhance GTPase activity. The stimulatory effect of phospholipid was mimicked, in part, by nonionic detergents. p21 may be related to other GTPases, the regulatory guanine nucleotide-binding G proteins of the hormone-sensitive adenylate cyclase complex and transducin of the retinal light-activated phosphodiesterase system. The G proteins and transducin are heterotrimers; the alpha subunits possess GTPase activity and the beta gamma subunit complex along with agonist-receptor complex or light-activated rhodopsin enhance GTP hydrolysis. p21 GTPase activity was slightly stimulated by rhodopsin, but, in contrast to the GTPase activity of transducin, stimulation was not light-dependent. GTP hydrolysis was enhanced somewhat by beta gamma subunit complex in the absence, but not in the presence, of rhodopsin. Like the G proteins and transducin, activity of p21 was altered by ADP-ribosylation. Modification of p21 catalyzed by an NAD: arginine ADP-ribosyltransferase purified from turkey erythrocytes decreased both GTPase activity and guanine nucleotide binding activity. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 24 |
| Volume Number | 82 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1985-01-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Adenosine Diphosphate Ribose Metabolism GTP Phosphohydrolases GTP-Binding Proteins Nucleoside Diphosphate Sugars Phospholipids Phosphoric Monoester Hydrolases Proto-Oncogenes Animals Cloning, Molecular Detergents Erythrocytes Enzymology Escherichia Coli Genetics Guanosine Triphosphate Kinetics Lysophosphatidylcholines Membrane Proteins Rhodopsin Transducin Turkeys Blood Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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