| First Author | Agudo-Ibáñez L | Year | 2015 |
| Journal | Mol Cell Biol | Volume | 35 |
| Issue | 11 | Pages | 1898-914 |
| PubMed ID | 25776558 | Mgi Jnum | J:224405 |
| Mgi Id | MGI:5662172 | Doi | 10.1128/MCB.01398-14 |
| Citation | Agudo-Ibanez L, et al. (2015) H-ras distribution and signaling in plasma membrane microdomains are regulated by acylation and deacylation events. Mol Cell Biol 35(11):1898-914 |
| abstractText | H-Ras must adhere to the plasma membrane to be functional. This is accomplished by posttranslational modifications, including palmitoylation, a reversible process whereby H-Ras traffics between the plasma membrane and the Golgi complex. At the plasma membrane, H-Ras has been proposed to occupy distinct sublocations, depending on its activation status: lipid rafts/detergent-resistant membrane fractions when bound to GDP, diffusing to disordered membrane/soluble fractions in response to GTP loading. Herein, we demonstrate that H-Ras sublocalization is dictated by its degree of palmitoylation in a cell type-specific manner. Whereas H-Ras localizes to detergent-resistant membrane fractions in cells with low palmitoylation activity, it locates to soluble membrane fractions in lineages where it is highly palmitoylated. Interestingly, in both cases GTP loading results in H-Ras diffusing away from its original sublocalization. Moreover, tilting the equilibrium between palmitoylation and depalmitoylation processes can substantially alter H-Ras segregation and, subsequently, its biochemical and biological functions. Thus, the palmitoylation/depalmitoylation balance not only regulates H-Ras cycling between endomembranes and the plasma membrane but also serves as a key orchestrator of H-Ras lateral diffusion between different types of plasma membrane and thereby of H-Ras signaling. |
