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首页> 外文期刊>Cell biology international. >Cellular distributions of the ERM proteins in MDCK epithelial cells: regulation by growth and cytoskeletal integrity.
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Cellular distributions of the ERM proteins in MDCK epithelial cells: regulation by growth and cytoskeletal integrity.

机译:ERM蛋白在MDCK上皮细胞中的细胞分布:通过生长和细胞骨架完整性进行调节。

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摘要

The highly homologous ERM (ezrin/radixin/moesin) proteins, molecular cross-linkers which connect the cell membrane with the underlying cytoskeleton, have molecular weights of 81, 80 and 78 kDa respectively. We present data which shows significant variation in the molecular weight and presence of multiple forms of ERM proteins in different cell lines, such that specific antibodies to each protein are essential for unambiguous detection. Biochemical fractionation of MDCK cells demonstrates that although the individual ERM fractionation patterns are unaltered by cell density, the multiple forms of moesin each associate with different subcellular fractions. Since ERM proteins can exist in dormant or active conformations corresponding to their phosphorylation state, we propose that the partitioning of ERM proteins between subcellular compartments may depend on their activation status. In addition, we show that when the co-localization between ezrin and F-actin is disrupted by cytochalasin D, MDCK cells undergo a dramatic morphology change during which long, branching, ezrin-rich protrusions are formed. Consistent with other workers, our data suggest that maintenance of ezrin:F-actin interactions are required for the maintenance of normal cellular morphology. Copyright 2001 Academic Press.
机译:高度同源的ERM(ezrin / radixin / moesin)蛋白是将细胞膜与下面的细胞骨架相连的分子交联剂,分子量分别为81、80和78 kDa。我们提供的数据显示出分子量的显着变化以及在不同细胞系中多种形式的ERM蛋白的存在,因此针对每种蛋白的特异性抗体对于明确检测必不可少。 MDCK细胞的生化分馏表明,尽管各个ERM的分馏模式不受细胞密度的影响,但多形性的moesin各自与不同的亚细胞级分相关。由于ERM蛋白可以处于与它们的磷酸化状态相对应的休眠或活性构象中,因此我们建议ERM蛋白在亚细胞区室之间的分配可能取决于它们的激活状态。此外,我们表明当细胞松弛素D破坏ezrin和F-肌动蛋白之间的共定位时,MDCK细胞会发生剧烈的形态变化,在此期间会形成长,分支,富含ezrin的突起。与其他工作者一致,我们的数据表明维持正常的细胞形态需要维持ezrin:F-肌动蛋白相互作用。版权所有2001,学术出版社。

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