首页> 外文期刊>American Journal of Physiology >Ion and diuretic specificity of chimeric proteins between apical Na(+)-K(+)-2Cl(-) and Na(+)-Cl(-) cotransporters.
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Ion and diuretic specificity of chimeric proteins between apical Na(+)-K(+)-2Cl(-) and Na(+)-Cl(-) cotransporters.

机译:顶端Na(+)-K(+)-2Cl(-)和Na(+)-Cl(-)共转运蛋白之间的嵌合蛋白的离子和利尿特异性。

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The mammalian kidney bumetanide-sensitive Na(+)-K(+)-2Cl(-) and thiazide-sensitive Na(+)-Cl(-) cotransporters are the major pathways for salt reabsorption in the thick ascending limb of Henle's loop and distal convoluted tubule, respectively. These cotransporters serve as receptors for the loop- and thiazide-type diuretics, and inactivating mutations of corresponding genes are associated with development of Bartter's syndrome type I and Gitleman's disease, respectively. Structural requirements for ion translocation and diuretic binding specificity are unknown. As an initial approach for analyzing structural determinants conferring ion or diuretic preferences in these cotransporters, we exploited functional differences and structural similarities between Na(+)-K(+)-2Cl(-) and Na(+)-Cl(-) cotransporters to design and study chimeric proteins in which the NH(2)-terminal and/or COOH-terminal domains were switched between each other. Thus six chimeric proteins were produced. Using the heterologous expressionsystem of Xenopus laevis oocytes, we observed that four chimeras exhibited functional activity. Our results revealed that, in the Na(+)-K(+)-2Cl(-) cotransporter, ion translocation and diuretic binding specificity are determined by the central hydrophobic domain. Thus NH(2)-terminal and COOH-terminal domains do not play a role in defining these properties. A similar conclusion can be suggested for the Na(+)-Cl(-) cotransporter.
机译:哺乳动物肾脏对布美他尼敏感的Na(+)-K(+)-2Cl(-)和噻嗪类敏感的Na(+)-Cl(-)共转运蛋白是盐在Henle环的较粗上升肢中重吸收的主要途径。远曲小管。这些共转运蛋白充当环和噻嗪类利尿剂的受体,相应基因的失活突变分别与I型巴特综合征和吉特曼氏病的发展有关。离子转运和利尿剂结合特异性的结构要求未知。作为分析在这些共转运蛋白中赋予离子或利尿剂偏好的结构决定簇的初始方法,我们利用了Na(+)-K(+)-2Cl(-)和Na(+)-Cl(-)共转运蛋白之间的功能差异和结构相似性设计和研究嵌合蛋白,其中NH(2)-末端和/或COOH-末端结构域在彼此之间切换。因此产生了六种嵌合蛋白。使用非洲爪蟾卵母细胞的异源表达系统,我们观察到四个嵌合体表现出功能活性。我们的结果表明,在Na(+)-K(+)-2Cl(-)共转运蛋白中,离子转运和利尿剂结合特异性由中央疏水域决定。因此,NH(2)-末端和COOH-末端域在定义这些特性中不起作用。对于Na(+)-Cl(-)共转运蛋白,可以提出类似的结论。

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