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Localization of palmitoylated and activated G protein α-subunit in Dictyostelium discoideum.

J. Cell. Biochem.2018 Jun;119(6):4975-4989. doi:10.1002/jcb.26689. Epub 2018 Feb 26
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摘要


Guanine nucleotide-binding proteins (G proteins) act as molecular switches to regulate many fundamental cellular processes. The lipid modification, palmitoylation, can be considered as a key factor for proper G protein function and plasma membrane localization. In Dictyostelium discoidum, Gα2 is essential for the chemotactic response to cAMP in their developmental life cycle. However, the regulation of Gα2 with respect to palmitoylation, activation and Gβγ association is less clear. In this study, Gα2 is shown to be palmitoylated on Cys-4 by [3 H]palmitate labeling. Loss of this palmitoylation site results in redistribution of Gα2 within the cell and poor D. discoideum development. Cellular re-localization is also observed for activated Gα2. In the membrane fraction, Gα2-wt (YFP) is highly enriched in a low-density membrane fraction, which is palmitoylation-dependent. Activated Gα2 monomer and heterotrimer are shifted to two different higher-density fractions. These results broaden our understanding of how G protein localization and function are regulated inside the cells.

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