Phospholipase C-mediated hydrolysis of PIP2 releases ERM proteins from lymphocyte membrane.

Phospholipase C-mediated hydrolysis of PIP2 releases ERM proteins from lymphocyte membrane.
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DOI:
10.1083/jcb.200807047
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发表时间:
2009-02-09
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Shaw S
Shaw S
中科院分区:
其他
文献类型:
--
作者:
Hao JJ;Liu Y;Kruhlak M;Debell KE;Rellahan BL;Shaw S

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控制ezrin/radixin/moesin (ERM)蛋白(连接细胞骨架和质膜)分解的机制尚不完全清楚。在淋巴细胞中,趋化因子(如SDF-1)刺激使ERM蛋白失活,导致其从质膜释放并去磷酸化。sdf -1介导的ERM蛋白失活被磷脂酶C (PLC)抑制剂阻断。相反,通过激活PLC、表达活性PLC突变体或将磷脂酰肌醇5-磷酸酶急性靶向质膜,可以降低磷脂酰肌醇4,5-二磷酸(PIP2)水平,从而促进moesin和ezrin的释放和去磷酸化。虽然拟磷蛋白(T558D)或ezrin (T567D)突变体的表达增强了膜的结合,但PLC的激活仍然使它们重新定位到细胞质中。同样,ERM蛋白与CD44细胞质尾部的体外结合也依赖于PIP2。这些结果证明了plc在快速细胞骨架重塑中的新作用,以及PIP2在ERM蛋白生物学中的另一个关键作用,即水解介导的ERM失活。
Mechanisms controlling the disassembly of ezrin/radixin/moesin (ERM) proteins, which link the cytoskeleton to the plasma membrane, are incompletely understood. In lymphocytes, chemokine (e.g., SDF-1) stimulation inactivates ERM proteins, causing their release from the plasma membrane and dephosphorylation. SDF-1–mediated inactivation of ERM proteins is blocked by phospholipase C (PLC) inhibitors. Conversely, reduction of phosphatidylinositol 4,5-bisphosphate (PIP2) levels by activation of PLC, expression of active PLC mutants, or acute targeting of phosphoinositide 5-phosphatase to the plasma membrane promotes release and dephosphorylation of moesin and ezrin. Although expression of phosphomimetic moesin (T558D) or ezrin (T567D) mutants enhances membrane association, activation of PLC still relocalizes them to the cytosol. Similarly, in vitro binding of ERM proteins to the cytoplasmic tail of CD44 is also dependent on PIP2. These results demonstrate a new role of PLCs in rapid cytoskeletal remodeling and an additional key role of PIP2 in ERM protein biology, namely hydrolysis-mediated ERM inactivation.
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