Human kidney anion exchanger 1 localisation in MDCK cells is controlled by the phosphorylation status of two critical tyrosines

Human kidney anion exchanger 1 localisation in MDCK cells is controlled by the phosphorylation status of two critical tyrosines
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人肾阴离子交换器 1 在 MDCK 细胞中的定位由两个关键酪氨酸的磷酸化状态控制

DOI:
10.1242/jcs.035584
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发表时间:
2008
影响因子:
4
通讯作者:
A. Toye
A. Toye
中科院分区:
生物学2区
文献类型:
--
作者:
Rosalind C. Williamson;A. C. Brown;W. Mawby;A. Toye

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肾脏的α-闰间细胞如何根据全身酸碱状态调节基底外侧肾阴离子交换蛋白1(kAE 1)的分布是肾脏生理学中的一个重要问题。先前使用MDCKI模型系统的工作表明,kAE 1基底外侧靶向需要一个N-末端决定簇和一个关键的C-末端酪氨酸(Y 904)。在这里,我们表明,N-末端决定簇是残基Y359,因为Y359 A取代突变体是错误的顶端膜。可能存在其他决定因素,因为一系列含有Y359的N-末端kAE 1截短错误地靶向TGN。KAE 1中的Y359和Y 904在过钒酸盐处理后被磷酸化,并且这种磷酸化对特异性Src激酶家族抑制剂敏感。我们测试了一系列的刺激,在这个模型系统,只有应用高非生理浓度的细胞外碳酸氢盐,并在较小程度上高渗或高渗透压,诱导kAE 1的酪氨酸磷酸化。用过钒酸盐处理引起kAE 1从质膜的内化,但用高浓度的碳酸氢盐处理没有,因为溶液的高渗性。我们认为,α-嵌入细胞通过酪氨酸残基Y359和Y 904的可逆磷酸化来控制kAE 1的分布。
An important question in renal physiology is how the α-intercalated cells of the kidney regulate the distribution of the basolateral kidney anion exchanger 1 (kAE1) according to systemic acid-base status. Previous work using a MDCKI model system demonstrated that kAE1 basolateral targeting requires an N-terminal determinant and a critical C-terminal tyrosine (Y904). Here, we show that the N-terminal determinant is residue Y359, because a Y359A substitution mutant was mistargeted to the apical membrane. Further determinants might exist because a range of N-terminal kAE1 truncations that contained Y359 were incorrectly targeted to the TGN. Y359 and Y904 in kAE1 are phosphorylated upon pervanadate treatment and this phosphorylation is sensitive to specific Src kinase family inhibitors. We tested a range of stimuli on this model system and only the application of high nonphysiological concentrations of extracellular bicarbonate, and to a lesser extent hypertonicity or hyperosmolarity, induced tyrosine phosphorylation of kAE1. Treatment with pervanadate caused internalisation of kAE1 from the plasma membrane, but treatment with high concentrations of bicarbonate did not, because of the hypertonicity of the solution. We propose that α-intercalated cells control the distribution of kAE1 by reversible phosphorylation of tyrosine residues Y359 and Y904.
DOI: 10.1152/ajprenal.1994.266.4.f633
发表时间: 1994
期刊: The American journal of physiology
影响因子: --
作者:
Verlander,JW;Madsen,KM;Cannon,JK;Tisher,CC
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发表时间: 1998-10
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DOI: --
发表时间: 1994
期刊: The Journal of biological chemistry
影响因子: --
作者:
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DOI: 10.1016/s1050-1738(02)00155-x
发表时间: 2002
影响因子: 9.3
作者:
Wang,Wen-Hui;Lin,Dao-Hong;Sterling,Hyacinth
通讯作者: Sterling,Hyacinth