Pik1 is a regulator of membrane traffic and participates in the mating-pheromone signal-transduction cascade. The protein is localised to the nucleus and cytoplasm in the Golgi. Pik1 is thought to have an actin-independent role in membrane transport [1].

1: The yeast phosphatidylinositol-4-OH kinase pik1 regulates secretion at the Golgi. Walch-Solimena C, Novick P; Nat Cell Biol. 1999;1:523-525. PMID:10587649