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Published online
doi:10.1083/jcb.200612017
The Journal of Cell Biology, Vol. 178, No. 1, 15-22
The Rockefeller University Press, 0021-9525 $30.00
© Fugmann et al.
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Regulation of secretory transport by protein kinase D–mediated phosphorylation of the ceramide transfer protein



Tim Fugmann, Angelika Hausser, Patrik Schöffler, Simone Schmid, Klaus Pfizenmaier, and Monilola A. Olayioye

University of Stuttgart, Institute of Cell Biology and Immunology, 70569 Stuttgart, Germany

Correspondence to Monilola A. Olayioye: monilola.olayioye{at}izi.uni-stuttgart.de

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.

T. Fugmann and A. Hausser contributed equally to this paper.

Abbreviations used in this paper: KD, kinase dead; MLV, multilamellar vesicle; PC, phosphatidylcholine; PH, pleckstrin homology; PI(4)P, phosphatidylinositol 4-phosphate; SM, sphingomyelin; START, steroidogenic acute regulatory lipid transfer; TNP-PE, 2,4,6-trinitrophenyl-phosphatidylethanolamine; WT, wild type.


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