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H-Ras distribution and signaling in plasma membrane microdomains are regulated by acylation and deacylation events

AuthorsAgudo-Ibáñez, Lorena; Herrero, Ana; Barbacid, Mariano; Crespo, Piero CSIC ORCID
Issue Date2015
PublisherAmerican Society for Microbiology
CitationMolecular and Cellular Biology 35(11): 1898-1914 (2015)
AbstractH-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.
Identifiersdoi: 10.1128/MCB.01398-14
issn: 1098-5549
e-issn: 0270-7306
Appears in Collections:(IBBTEC) Artículos
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