DHHC protein-dependent palmitoylation protects regulator of G-protein signaling 4 from proteasome degradation.

DHHC protein-dependent palmitoylation protects regulator of G-protein signaling 4 from proteasome degradation.
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DOI:
10.1016/j.febslet.2010.10.052
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发表时间:
2010-11-19
期刊:
影响因子:
3.5
通讯作者:
Tu Y
Tu Y
中科院分区:
生物学3区
文献类型:
--
作者:
Wang J;Xie Y;Wolff DW;Abel PW;Tu Y

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G蛋白信号调节蛋白4(RGS4)是G蛋白偶联受体(GPCR)介导信号转导的一种细胞内调节因子,其受到包括棕榈酰化和蛋白酶体降解等多种过程的调控。我们发现,共表达DHHC酰基转移酶(DHHC3或DHHC7),而非其酰基转移酶失活突变体,可提高RGS4的表达水平,但对其半胱氨酸2突变为丝氨酸的突变体(RGS4C2S)则无此作用。在体内,DHHC3与RGS4相互作用并使其棕榈酰化,但不作用于RGS4C2S。棕榈酰化使RGS4的半衰期延长8倍以上,且棕榈酰化的RGS4可阻断α1A - 肾上腺素能受体刺激引起的细胞内钙离子动员。综上所述,我们的研究结果表明,DHHC蛋白可通过提高RGS4的稳定性来调节GPCR介导的信号转导。 MINT - 8049215:Rgs4(UniProtKB:P49799)与DHHC3(UniProtKB:Q8R173)通过抗标签共免疫沉淀(MI:0007)发生物理相互作用(MI:0915)
Regulator of G-protein signaling 4 (RGS4), an intracellular modulator of G-protein coupled receptor (GPCR)-mediated signaling, is regulated by multiple processes including palmitoylation and proteasome degradation. We found that co-expression of DHHC acyltransferases (DHHC3 or DHHC7), but not their acyltransferase-inactive mutants, increased expression levels of RGS4 but not its Cys2 to Ser mutant (RGS4C2S). DHHC3 interacts with and palmitoylates RGS4 but not RGS4C2S in vivo. Palmitoylation prolongs the half-life of RGS4 by over 8-fold and palmitoylated RGS4 blocked α1A-adrenergic receptor -stimulated intracellular Ca2+ mobilization. Together, our findings revealed that DHHC proteins could regulate GPCR-mediated signaling by increasing RGS4 stability. MINT-8049215: Rgs4 (uniprotkb:P49799) physically interacts (MI:0915) with DHHC3 (uniprotkb:Q8R173) by anti tag coimmunoprecipitation (MI:0007)
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