首页> 外文期刊>American Journal of Physiology >PDZ proteins retain and regulate membrane transporters in polarized epithelial cell membranes.
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PDZ proteins retain and regulate membrane transporters in polarized epithelial cell membranes.

机译:PDZ蛋白保留并调节极化上皮细胞膜中的膜转运蛋白。

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摘要

The plasma membrane of epithelial cells is subdivided into two physically separated compartments known as the apical and basolateral membranes. To obtain directional transepithelial solute transport, membrane transporters (i.e., ion channels, cotransporters, exchangers, and ion pumps) need to be targeted selectively to either of these membrane domains. In addition, the transport properties of an epithelial cell will be maintained only if these membrane transporters are retained and properly regulated in their specific membrane compartments. Recent reports have indicated that PDZ domain-containing proteins play a dual role in these processes and, in addition, that different apical and basolateral PDZ proteins perform similar tasks in their respective membrane domains. First, although PDZ-based interactions are dispensable for the biosynthetic targeting to the proper membrane domain, the PDZ network ensures that the membrane proteins are efficiently retained at the cell surface. Second, the close spatialpositioning of functionally related proteins (e.g., receptors, kinases, channels) into a signal transduction complex (transducisome) allows fast and efficient control of membrane transport processes.
机译:上皮细胞的质膜可细分为两个物理分隔的隔室,称为顶膜和基底外侧膜。为了获得定向的上皮溶质转运,需要将膜转运蛋白(即离子通道,共转运蛋白,交换剂和离子泵)选择性地靶向这些膜结构域中的任何一个。另外,仅当这些膜转运蛋白保留并在其特定的膜区室中得到适当调节时,才能维持上皮细胞的转运特性。最近的报道表明,含PDZ结构域的蛋白质在这些过程中起着双重作用,此外,不同的顶端和基底外侧PDZ蛋白在其各自的膜结构域中执行相似的任务。首先,尽管基于PDZ的相互作用对于生物合成靶向适当的膜结构域是必不可少的,但PDZ网络可确保将膜蛋白有效地保留在细胞表面。其次,功能相关蛋白(例如受体,激酶,通道)在信号转导复合体(转导体)中的紧密空间定位允许对膜转运过程的快速有效控制。

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