Tonic activity of Galpha-gustducin regulates taste cell responsivity.
Tonic activity of Galpha-gustducin regulates taste cell responsivity.
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DOI:
10.1016/j.febslet.2008.10.007
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发表时间:
2008-11-12
期刊:
影响因子:
3.5
通讯作者:
Kinnamon SC
中科院分区:
文献类型:
--
作者:
Clapp TR;Trubey KR;Vandenbeuch A;Stone LM;Margolskee RF;Chaudhari N;Kinnamon SC
The taste-selective G protein, α-gustducin (α-gus) is homologous to α-transducin and activates phosphodiesterase in vitro. α-Gustducin-knockout mice are compromised to bitter, sweet and umami taste stimuli, suggesting a central role in taste transduction. Here, we suggest a different role for Gα-gustducin. In taste buds of α-gustducin 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 gustducin-lineage cells of knockout mice. We propose that an important role of α-gustducin is to maintain cAMP levels tonically low to ensure adequate Ca2+ signaling.
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