Probing phosphoinositide functions in signaling and membrane trafficking

C Peter Downes, Alex Gray, John M Lucocq

Research output: Contribution to journalArticlepeer-review

187 Citations (Scopus)


The inositol phospholipids (PIs) comprise a family of eight species with different combinations of phosphate groups arranged around the inositol ring. PIs are among the most versatile signaling molecules known, with key roles in receptor-mediated signal transduction, actin remodeling and membrane trafficking. Recent studies have identified effector proteins and specific lipid-binding domains through which PIs signal. These lipid-binding domains can be used as probes to further our understanding of the spatial and temporal control of individual PI species. New layers of complexity revealed by the use of such probes include the occurrence of PIs at intracellular locations, the identification of phosphatidylinositol signaling hotspots and the presence of non-membrane pools of PIs in cell nuclei.
Original languageEnglish
Pages (from-to)259-68
Number of pages10
JournalTrends in Cell Biology
Issue number5
Publication statusPublished - May 2005


  • Cell Membrane
  • Intracellular Membranes
  • Membrane Lipids
  • Models, Biological
  • Phosphatidylinositol 3-Kinases
  • Phosphatidylinositol 4,5-Diphosphate
  • Phosphatidylinositols
  • Protein Binding
  • Signal Transduction


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