Regulation of secretory transport by protein kinase D-mediated phosphorylation of the ceramide transfer protein.

Regulation of secretory transport by protein kinase D-mediated phosphorylation of the ceramide transfer protein.
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DOI:
10.1083/jcb.200612017
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发表时间:
2007-07-02
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Olayioye MA
Olayioye MA
中科院分区:
其他
文献类型:
--
作者:
Fugmann T;Hausser A;Schöffler P;Schmid S;Pfizenmaier K;Olayioye MA

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蛋白激酶D(PKD)被认为是跨高尔基体神经网络(TGN)分泌转运的重要调节因子。PKD在TGN的募集和激活是由脂二酰甘油介导的,其中的一池是由神经酰胺和磷脂酰胆碱的鞘磷脂合成酶产生的。神经酰胺从内质网到高尔基复合体的非囊泡转移是由脂转移蛋白CERT(神经酰胺转运)介导的。在这项研究中,我们确定CERT是一种新的体内PKD底物。PKD对丝氨酸132的磷酸化降低了CERT与其在高尔基膜上的脂靶磷脂酰肌醇4-磷酸的亲和力,并降低了神经酰胺的转运活性,从而确认PKD是一种脂质稳态的调节因子。我们还表明,CERT反过来对于PKD激活和PKD依赖的蛋白质货物运输到质膜上是至关重要的。因此,PKD和CERT的相互依赖是维持高尔基体膜完整性和分泌转运的关键。
Protein kinase D (PKD) has been identified as a crucial regulator of secretory transport at the trans-Golgi network (TGN). Recruitment and activation of PKD at the TGN is mediated by the lipid diacylglycerol, a pool of which is generated by sphingomyelin synthase from ceramide and phosphatidylcholine. The nonvesicular transfer of ceramide from the endoplasmic reticulum to the Golgi complex is mediated by the lipid transfer protein CERT (ceramide transport). In this study, we identify CERT as a novel in vivo PKD substrate. Phosphorylation on serine 132 by PKD decreases the affinity of CERT toward its lipid target phosphatidylinositol 4-phosphate at Golgi membranes and reduces ceramide transfer activity, identifying PKD as a regulator of lipid homeostasis. We also show that CERT, in turn, is critical for PKD activation and PKD-dependent protein cargo transport to the plasma membrane. Thus, the interdependence of PKD and CERT is key to the maintenance of Golgi membrane integrity and secretory transport.
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