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- W2038662242 abstract "We have characterized the dynamic nature of β2-adrenergic receptor palmitoylation in Sf9 cells. Under basal conditions, the turnover of receptor-bound palmitate is rapid (half-life = 9.8 ± 1.8 min) compared to the turnover rate of the receptor protein itself (half-life = 109 ± 10 min). This suggests that an equilibrium between the palmitoylated and nonpalmitoylated forms of the receptor exists at resting state. Stimulation of the receptor by the agonist isoproterenol reduces the half-life of the β2-adrenergic receptor-bound palmitate by 1.8 fold without affecting the turnover rate of the receptor itself. Upon sustained stimulation, this increased palmitate turnover rate shifted the equilibrium toward the nonpalmitoylated form of the receptor, suggesting that prolonged activation either increases the rate of depalmitoylation or prevents receptor palmitoylation. Consistent with the latter possibility, pretreatment of cells with agonist, prior to metabolic labeling, reduced the incorporation of [3H]palmitate into the β2-adrenergic receptor by more than 80%. This suggests a link between receptor desensitization occurring upon sustained agonist stimulation and the decrease in receptor palmitoylation. Supporting this hypothesis, mutation of PKA phosphorylation sites known to be involved in receptor desensitization abolished the agonist-promoted reduction in palmitate incorporation. We have previously reported that palmitoylation of the β2-adrenergic receptor is important in controlling receptor phosphorylation by PKA [Moffett, S., et al. (1993) EMBO J. 12, 349−356; Moffett, S., et al. (1996) J. Biol. Chem. 271, 21490−21497]. The present study now demonstrates that the receptor palmitoylation state is regulated by agonist stimulation and suggests the existence of concerted reciprocal regulatory interactions between palmitoylation and phosphorylation upon sustained receptor stimulation." @default.
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- W2038662242 title "Agonist Stimulation Increases the Turnover Rate of β<sub>2</sub>AR-Bound Palmitate and Promotes Receptor Depalmitoylation" @default.
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- W2038662242 doi "https://doi.org/10.1021/bi9611321" @default.
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