Activity-dependent phosphorylation of dynamin 1 at serine 857.

Activity-dependent phosphorylation of dynamin 1 at serine 857.
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动力蛋白 1 在丝氨酸 857 处的活性依赖性磷酸化。

DOI:
10.1021/bi2017798
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发表时间:
2012
期刊:
影响因子:
2.9
通讯作者:
Hwang,Yu-Wen
Hwang,Yu-Wen
中科院分区:
生物学3区
文献类型:
--
作者:
Xie,Wen;Adayev,Tatyana;Zhu,Huiyuan;Wegiel,Jerzy;Wieraszko,Andrzej;Hwang,Yu-Wen

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动力学蛋白1被认为以磷酸化依赖的方式通过与多种内吞辅助蛋白的相互作用介导突触传递。在此之前,我们已经发现DYRK1A,一个与唐氏综合症智力迟钝有关的21号染色体编码的激酶,主要磷酸化富含脯氨酸区域的丝氨酸857 (S857),仅在dynamin 1的另一种c端剪接异构体1xa中发现。Dynamin 1xa和1xb亚型能够组装成异源复合物,并在体外与amphiphysin结合时受DYRK1A磷酸化的共同调节。为了帮助评估S857磷酸化的生理意义,我们开发了一种半定量方法来测量phospho-S857 (pS857)的细胞水平。在静息海马神经元和海马细胞系中,Dynamin 1xa在S857位点高度磷酸化,所有内源性蛋白的bb60 %在该位点磷酸化。在海马中,pS857的水平受Ca2+/钙调磷酸酶和AMPA/kainate受体参与的突触刺激的动态控制。免疫荧光染色显示pS857存在于静息锥体神经元的胞体和顶端树突的整个长度。Schaffer侧枝通路中的神经元刺激促进了顶端树突远端区域pS857的去磷酸化,该区域与Schaffer侧枝的冲击轴突形成突触。综上所述,我们的研究结果支持S857磷酸化是一个生理事件,其水平受神经末梢神经元活动的调节。
Dynamin 1 is thought to mediate synaptic transmission through interactions with multiple endocytic accessory proteins in a phosphorylation-dependent manner. Previously, we have shown that DYRK1A, a chromosome 21-encoded kinase implicated in the mental retardation of Down syndrome, phosphorylates primarily serine 857 (S857) in the proline-rich domain, found only in 1xa, one of the alternative C-terminal splicing isoforms of dynamin 1. Dynamin 1xa and 1xb isoforms are able to assemble into heterologous complexes and are coregulated by DYRK1A phosphorylation in binding to amphiphysin in vitro. To help in assessing the physiological significance of S857 phosphorylation, we developed a semiquantitative method for measuring the cellular level of phospho-S857 (pS857). Dynamin 1xa is highly phosphorylated at S857 in resting hippocampal neurons and in a hippocampal cell line, with >60% of all endogenous protein phosphorylated at this residue. In the hippocampus, the level of pS857 is dynamically controlled by synaptic stimulations with the involvement of Ca2+/calcineurin and AMPA/kainate receptors. Immunofluorescence staining shows that pS857 is found in the soma and throughout the entire length of apical dendrites in resting pyramidal neurons. Neuronal stimulation in the Schaffer collateral pathway promotes pS857 dephosphorylation in distal areas of apical dendrites, the region forming synapses with the impinging axons of Schaffer collateral. In summary, our results support the conclusion that S857 phosphorylation is a physiological event and its level is modulated by neuronal activity in nerve terminals.
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