
The yeast phosphatidylinositol 4-kinase Pik1p is essential for proliferation, and it controls Golgi homeostasis and transport of newly synthesized proteins from this compartment. At the Golgi, phosphatidylinositol 4-phosphate recruits multiple cytosolic effectors involved in formation of post-Golgi transport vesicles. A second pool of catalytically active Pik1p localizes to the nucleus. The physiological significance and regulation of this dual localization of the lipid kinase remains unknown. Here, we show that Pik1p binds to the redundant 14-3-3 proteins Bmh1p and Bmh2p. We provide evidence that nucleocytoplasmic shuttling of Pik1p involves phosphorylation and that 14-3-3 proteins bind Pik1p in the cytoplasm. Nutrient deprivation results in relocation of Pik1p from the Golgi to the nucleus and increases the amount of Pik1p–14-3-3 complex, a process reversed upon restored nutrient supply. These data suggest a role of Pik1p nucleocytoplasmic shuttling in coordination of biosynthetic transport from the Golgi with nutrient signaling.
Cell Nucleus, Saccharomyces cerevisiae Proteins, Molecular Sequence Data, Active Transport, Cell Nucleus, Golgi Apparatus, Saccharomyces cerevisiae, Models, Biological, Phosphoserine, 14-3-3 Proteins, Food, Multiprotein Complexes, Mutation, Amino Acid Sequence, Phosphorylation, 1-Phosphatidylinositol 4-Kinase, Cell Proliferation, Protein Binding, trans-Golgi Network
Cell Nucleus, Saccharomyces cerevisiae Proteins, Molecular Sequence Data, Active Transport, Cell Nucleus, Golgi Apparatus, Saccharomyces cerevisiae, Models, Biological, Phosphoserine, 14-3-3 Proteins, Food, Multiprotein Complexes, Mutation, Amino Acid Sequence, Phosphorylation, 1-Phosphatidylinositol 4-Kinase, Cell Proliferation, Protein Binding, trans-Golgi Network
| selected citations These citations are derived from selected sources. This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | 56 | |
| popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network. | Top 10% | |
| influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | Top 10% | |
| impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network. | Top 10% |
