期刊
FEBS LETTERS
卷 582, 期 27, 页码 3783-3787出版社
WILEY
DOI: 10.1016/j.febslet.2008.10.007
关键词
Taste transduction; Calcium signaling; Phosphodiesterase; Protein kinase A
资金
- NIH [DC00766, DC006021, DC003055]
The taste-selective G protein, alpha-gustducin (alpha-gus) is homologous to alpha-transducin and activates phosphodiesterase (PDE) in vitro. alpha-Gus-knockout mice are compromized to bitter, sweet and umami taste stimuli, suggesting a central role in taste transduction. Here, we suggest a different role for G alpha-gus. In taste buds of alpha-gus-knockout mice, basal (unstimulated) cAMP levels are high compared to those of wild-type mice. Further, H-89, a cAMP-dependent protein kinase inhibitor, dramatically unmasks responses to the bitter tastant denatonium in gus-line-age cells of knockout mice. We propose that an important role of alpha-gus is to maintain cAMP levels tonically low to ensure adequate Ca2+ signaling. (C) 2008 Federation of European Biochemical Societies. Published by Elsevier B. V. All rights reserved.
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