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Protein Kinase D Regulates Vesicular Transport by Phosphorylating and Activating Phosphatidylinositol-4 Kinase IIIbeta at the Golgi Complex

Overview
Journal Nat Cell Biol
Specialty Cell Biology
Date 2005 Aug 16
PMID 16100512
Citations 155
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Abstract

Protein kinase D (PKD) regulates the fission of vesicles originating from the trans-Golgi network. We show that phosphatidylinositol 4-kinase IIIbeta (PI4KIIIbeta) - 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 PI4KIIIbeta at a motif that is highly conserved from yeast to humans. PKD-mediated phosphorylation stimulated lipid kinase activity of PI4KIIIbeta and enhanced vesicular stomatitis virus G-protein transport to the plasma membrane. The identification of PI4KIIIbeta as one of the PKD substrates should help to reveal the molecular events that enable transport-carrier formation.

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