Protein kinase D (PKD) regulates the fission of vesicles originating from the trans-Golgi network. We show that phosphatidylinositol 4-kinase IIIβ (PI4KIIIβ) - a key player in the structure and function of the Golgi complex - is a physiological substrate of PKD. Of the three PKD isoforms, only PKD1 and PKD2 phosphorylated PI4KIIIβ at a motif that is highly conserved from yeast to humans. PKD-mediated phosphorylation stimulated lipid kinase activity of PI4KIIIβ and enhanced vesicular stomatitis virus G-protein transport to the plasma membrane. The identification of PI4KIIIβ as one of the PKD substrates should help to reveal the molecular events that enable transport-carrier formation.
ASJC Scopus subject areas
- Cell Biology