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The Golgi apparatus has long been suggested to be important for directing secretion to specific sites on the plasma membrane in response to extracellular signaling events. However, the mechanisms by which signaling events are coordinated with Golgi apparatus function remain poorly understood. Here, we identify a scaffolding function for the Golgi matrix protein GM130 that sheds light on how such signaling events may be regulated. We show that the mammalian Ste20 kinases YSK1 and MST4 target to the Golgi apparatus via the Golgi matrix protein GM130. In addition, GM130 binding activates these kinases by promoting autophosphorylation of a conserved threonine within the T-loop. Interference with YSK1 function perturbs perinuclear Golgi organization, cell migration, and invasion into type I collagen. A biochemical screen identifies 14-3-3zeta as a specific substrate for YSK1 that localizes to the Golgi apparatus, and potentially links YSK1 signaling at the Golgi apparatus with protein transport events, cell adhesion, and polarity complexes important for cell migration.

Original publication

DOI

10.1083/jcb.200310061

Type

Journal article

Journal

J Cell Biol

Publication Date

29/03/2004

Volume

164

Pages

1009 - 1020

Keywords

14-3-3 Proteins, Autoantigens, Cell Movement, DNA, Complementary, Enzyme Activation, Golgi Apparatus, Humans, Intracellular Signaling Peptides and Proteins, MAP Kinase Signaling System, Male, Membrane Proteins, Mutagenesis, Site-Directed, Phosphorylation, Point Mutation, Polymerase Chain Reaction, Protein-Serine-Threonine Kinases, Recombinant Proteins, Substrate Specificity, Testis, Tyrosine 3-Monooxygenase