Courier service for phosphatidylinositol: PITPs deliver on demand.

Courier service for phosphatidylinositol: PITPs deliver on demand.
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磷脂酰肌醇的浓缩服务:PITP按需提供。

DOI:
10.1016/j.bbalip.2021.158985
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发表时间:
2021-09
期刊:
Biochimica et biophysica acta. Molecular and cell biology of lipids
影响因子:
--
通讯作者:
Cockcroft S
Cockcroft S
中科院分区:
其他
文献类型:
--
作者:
Ashlin TG;Blunsom NJ;Cockcroft S

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磷脂酰肌醇是合成7种磷酸化肌醇脂类的母体脂类,每种磷脂在受体介导的信号转导、肌动蛋白细胞骨架动力学和膜转运等过程中都发挥着特定的作用。PI的合成定位于内质网(ER),而其磷酸化的衍生物也存在于其他细胞器中,这些细胞器中也有脂蛋白激酶的存在。磷脂酰肌醇(PI)在质膜上被磷酸化为磷脂酰肌醇(4,5)二磷酸(PI(4,5)P2),在高尔基体上被磷酸化成磷脂酰肌醇4-磷酸(PI4P),分别是脂质信号和高尔基体功能中的关键事件。在这里,我们回顾了一类蛋白质,磷脂酰肌醇转移蛋白(PITPs),它可以动员内质网中的磷脂酰肌醇转移蛋白为驻留的激酶提供底物进行磷酸化。最近的研究发现,三种可溶性PITP(PITPα、PITPβ和PITPNC1)在磷脂酶C信号转导、神经功能、膜转运、病毒复制和癌症转移中具有特定和重叠的功能。
Phosphatidylinositol is the parent lipid for the synthesis of seven phosphorylated inositol lipids and each of them play specific roles in numerous processes including receptor-mediated signalling, actin cytoskeleton dynamics and membrane trafficking. PI synthesis is localised to the endoplasmic reticulum (ER) whilst its phosphorylated derivatives are found in other organelles where the lipid kinases also reside. Phosphorylation of PI to phosphatidylinositol (4,5) bisphosphate (PI(4,5)P2) at the plasma membrane and to phosphatidylinositol 4-phosphate (PI4P) at the Golgi are key events in lipid signalling and Golgi function respectively. Here we review a family of proteins, phosphatidylinositol transfer proteins (PITPs), that can mobilise PI from the ER to provide the substrate to the resident kinases for phosphorylation. Recent studies identify specific and overlapping functions for the three soluble PITPs (PITPα, PITPβ and PITPNC1) in phospholipase C signalling, neuronal function, membrane trafficking, viral replication and in cancer metastases.
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