Simultaneous Binding of Two Protein Kinases to a Calcium-Dependent Potassium Channel

Simultaneous Binding of Two Protein Kinases to a Calcium-Dependent Potassium Channel
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两种蛋白激酶同时结合钙依赖性钾通道

DOI:
10.1523/jneurosci.19-10-j0005.1999
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发表时间:
1999
期刊:
The Journal of Neuroscience
影响因子:
--
通讯作者:
I. Levitan
I. Levitan
中科院分区:
--
文献类型:
--
作者:
Jing Wang;Yi Zhou;Hua Wen;I. Levitan

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大电导钙依赖性钾通道受蛋白激酶、磷酸酶和其他信号蛋白的调节,并且从电生理学实验中推断,信号蛋白有时可以在调节复合物中与这些通道密切相关。我们在这里表明,内源性蛋白激酶活性coimmunoprecipitates与本地和重组果蝇Slowpoke(dSlo)钙依赖性钾通道。使用针对几种蛋白激酶的抗体的免疫共沉淀实验表明,dSlo可以同时结合Src酪氨酸激酶和cAMP依赖性蛋白激酶(PKAc)的催化亚基。这两种激酶都可以磷酸化果蝇头部和异源宿主细胞中的通道。PKAc直接结合到dSlo的C-末端结构域中的172个氨基酸区域,而不需要调节亚基或锚定蛋白的干预,并且PKAc的通道磷酸化对于这种结合相互作用是不需要的。相反,dSlo中的几个可磷酸化的酪氨酸残基对于Src结合是重要的。这些结果与离子通道可以作为其自身特定的一组调节酶的支架的想法一致。
Large-conductance calcium-dependent potassium channels are subject to modulation by protein kinases, phosphatases, and other signaling proteins, and it has been inferred from electrophysiological experiments that signaling proteins sometimes can be intimately associated with these channels in a regulatory complex. We show here that endogenous protein kinase activity coimmunoprecipitates with both native and recombinant Drosophila Slowpoke (dSlo) calcium-dependent potassium channels. Coimmunoprecipitation experiments using antibodies against several protein kinases demonstrate that dSlo can bind simultaneously to the Src tyrosine kinase and to the catalytic subunit of the cAMP-dependent protein kinase (PKAc). Both kinases can phosphorylate the channel in Drosophila heads and in heterologous host cells. The PKAc binds directly to a 172-amino acid region in the C-terminal domain of dSlo, without the intervention of regulatory subunits or anchoring proteins, and channel phosphorylation by PKAc is not required for this binding interaction. In contrast, several phosphorylatable tyrosine residues in dSlo are important for Src binding. The results are consistent with the idea that an ion channel can act as a scaffold for its own specific set of modulatory enzymes.
烟碱乙酰胆碱受体与 Fyn 和 Fyk 蛋白酪氨酸激酶的 SH2 结构域的结合。
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