| First Author | Salcedo A | Year | 2006 |
| Journal | EMBO J | Volume | 25 |
| Issue | 20 | Pages | 4752-62 |
| PubMed ID | 17006543 | Mgi Jnum | J:129776 |
| Mgi Id | MGI:3770142 | Doi | 10.1038/sj.emboj.7601351 |
| Citation | Salcedo A, et al. (2006) Mdm2 is involved in the ubiquitination and degradation of G-protein-coupled receptor kinase 2. EMBO J 25(20):4752-62 |
| abstractText | G-protein-coupled receptor kinase 2 (GRK2) is a central regulator of G-protein-coupled receptor signaling. We report that Mdm2, an E3-ubiquitin ligase involved in the control of cell growth and apoptosis, plays a key role in GRK2 degradation. Mdm2 and GRK2 association is enhanced by beta(2)-adrenergic receptor stimulation and beta-arrestin. Increased Mdm2 expression accelerates GRK2 proteolysis and promotes kinase ubiquitination at defined residues, whereas GRK2 turnover is markedly impaired in Mdm2-deficient cells. Moreover, we find that activation of the PI3K/Akt pathway by insulin-like growth factor-1 alters Mdm2-mediated GRK2 degradation, leading to enhanced GRK2 stability and increased kinase levels. These data put forward a novel mechanism for controlling GRK2 expression in physiological and pathological conditions. |
