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Yeast phosphatidylinositol 4-kinase, Pik1, has essential roles at the Golgi and in the nucleus.

Phosphatidylinositol 4-kinase, Pik1, is essential for viability. GFP-Pik1 localized to cytoplasmic puncta and the nucleus. The puncta colocalized with Sec7-DsRed, a marker of trans-Golgi cisternae. Kap95 (importin-beta) was necessary for nuclear entry, but not Kap60 (importin-alpha), and exportin Msn5 was required for nuclear exit. Frq1 (frequenin orthologue) also is essential for viability and binds near the NH2 terminus of Pik1. Frq1-GFP localized to Golgi puncta, and Pik1 lacking its Frq1-binding site (or Pik1 overexpressed in frq1Delta cells) did not decorate the Golgi, but nuclear localization was unperturbed. Pik1(Delta10-192), which lacks its nuclear export sequence, displayed prominent nuclear accumulation and did not rescue inviability of pik1Delta cells. A Pik1-CCAAX chimera was excluded from the nucleus and also did not rescue inviability of pik1Delta cells. However, coexpression of Pik1(Delta10-192) and Pik1-CCAAX in pik1Delta cells restored viability. Catalytically inactive derivatives of these compartment-restricted Pik1 constructs indicated that PtdIns4P must be generated both in the nucleus and at the Golgi for normal cell function.[1]

References

  1. Yeast phosphatidylinositol 4-kinase, Pik1, has essential roles at the Golgi and in the nucleus. Strahl, T., Hama, H., DeWald, D.B., Thorner, J. J. Cell Biol. (2005) [Pubmed]
 
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