期刊
JOURNAL OF BIOLOGICAL CHEMISTRY
卷 286, 期 50, 页码 43361-43369出版社
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M111.267286
关键词
-
资金
- National Institutes of Health [R01GM076167]
A number of signaling molecules are involved in the activation of the mitogen-activated protein kinase (MAPK) pathway by G protein-coupled receptors. In this study, we have demonstrated that alpha(2B)-adrenergic receptor (alpha(2B)-AR) interacts with ADP-ribosylation factor 1 (ARF1), a small GTPase involved in vesicle-mediated trafficking, in an agonist activation-dependent manner and that the interaction is mediated through a unique double Trp motif in the third intracellular loop of the receptor. Interestingly, mutation of the double Trp motif and siRNA-mediated depletion of ARF1 attenuate alpha(2B)-AR-mediated activation of extracellular signal-regulated kinases 1/2 (ERK1/2) without altering receptor intracellular trafficking, whereas expression of the constitutively active mutant ARF1Q71L and ARNO, a GDP-GTP exchange factor of ARF1, markedly enhances the activation of Raf1, MEK1, and ERK1/2. These data strongly demonstrate that the small GTPase ARF1 modulates ERK1/2 activation by alpha(2B)-AR and provide the first evidence indicating a novel function for ARF1 in regulating the MAPK signaling pathway.
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