Molecular cloning of G proteins and phosphodiesterases from rat taste cells

Molecular cloning of G proteins and phosphodiesterases from rat taste cells
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大鼠味觉细胞 G 蛋白和磷酸二酯酶的分子克隆

DOI:
10.1016/0031-9384(94)90360-3
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发表时间:
1994
影响因子:
2.9
通讯作者:
R. Margolskee
R. Margolskee
中科院分区:
医学3区
文献类型:
--
作者:
S. K. Mclaughlin;P. Mckinnon;N. Spickofsky;W. Danho;R. Margolskee

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为了鉴定和鉴定这些与味觉转导相关的蛋白质,我们从大鼠味觉组织中克隆了G蛋白和磷酸二酯酶。利用与G蛋白α亚单位保守区对应的简并引物,通过聚合酶链式反应扩增并克隆了αI-2、αI-3、α12、α14、α8、αt-Rod、α1-cone和αGustducin 8个差异表达基因。αI-3、α14、α8和α在味觉组织中的表达高于周围无感觉组织。αGustducin只在味觉细胞中表达。Rod转导蛋白以前只在视网膜的视杆细胞中发现,在那里它将光刺激视紫红质转化为cGMP磷酸二酯酶的激活。αGustducin的初级序列在受体相互作用结构域和磷酸二酯酶激活位点上与杆状转导蛋白有显著的相似性。我们认为味觉蛋白和转导蛋白调节味觉细胞的磷酸二酯酶活性,这可能促进苦味转导和抑制甜味转导。与此一致,我们从味觉组织中克隆了两种类型的cAMP PDE:DNC-1和PDE-3。
To identify and characterize those proteins involved in taste transduction, we cloned G proteins and phosphodiesterases from rat taste tissue. Using degenerate primers corresponding to conserved regions of G protein α subunits, the polymerase chain reaction was used to amplify and clone eight distinct cDNAs:αi-2, αi-3, α12, α14, α8, αt-rod, α1-coneand α gustducin. αi-3, α14, α8, and αt-rodare more highly expressed in taste tissue than in the surrounding nonsensory tissue. α gustducin is only expressed in taste cells. Rod transducin had previously been found only in the rod cells of the retina, where it converts light stimulation of rhodopsin into activation of cGMP phosphodiesterase. The primary sequence of α gustducin shows striking similarities to rod transducin in the receptor interaction domain and the phosphodiesterase activation site. We propose that gustducin and transducin regulate phosphodiesterase activity in taste cells and that this may promote bitter transduction and inhibit sweet transduction. Consistent with this proposal, we cloned two types of cAMP PDE from taste tissue: dnc-1 and PDE-3.
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