title: Phosphatidylinositol transfer proteins and instructive regulation of lipid kinase biology.
abstract: Phosphatidylinositol is a metabolic precursor of phosphoinositides and soluble inositol phosphates. Both sets of molecules represent versatile intracellular chemical signals in eukaryotes. While much effort has been invested in understanding the enzymes that produce and consume these molecules, central aspects for how phosphoinositide production is controlled and functionally partitioned remain unresolved and largely unappreciated. It is in this regard that phosphatidylinositol (PtdIns) transfer proteins (PITPs) are emerging as central regulators of the functional channeling of phosphoinositide pools produced on demand for specific signaling purposes. The physiological significance of these proteins is amply demonstrated by the consequences that accompany deficits in individual PITPs. Although the biological problem is fascinating, and of direct relevance to disease, PITPs remain largely uncharacterized. Herein, we discuss our perspectives regarding what is known about how PITPs work as molecules, and highlight progress in our understanding of how PITPs are integrated into cellular physiology. This article is part of a Special Issue entitled Phosphoinositides.
authors.affiliation: Department of Molecular & Cellular Medicine, Texas A&M Health Science Center, College Station, TX 77843-1114, USA.
authors.forename: Aby
authors.initials: A
authors.lastname: Grabon
authors.affiliation: Department of Biochemistry & Biophysics, Texas A&M University, College Station, TX 77843-2128, USA.
authors.forename: Danish
authors.initials: D
authors.lastname: Khan
authors.affiliation: Department of Molecular & Cellular Medicine, Texas A&M Health Science Center, College Station, TX 77843-1114, USA; Department of Biochemistry & Biophysics, Texas A&M University, College Station, TX 77843-2128, USA. Electronic address: vytas@tamhsc.edu.
authors.forename: Vytas A
authors.initials: VA
authors.lastname: Bankaitis
mesh_terms: D001692:Biological Transport; D051607:CDP-Diacylglycerol-Inositol 3-Phosphatidyltransferase / Q000235:genetics / Q000378:metabolism; D005786:Gene Expression Regulation; D006801:Humans; D050356:Lipid Metabolism; D008958:Models, Molecular; D010716:Phosphatidylinositols / Q000378:metabolism*; D049294:Phospholipid Transfer Proteins / Q000235:genetics / Q000378:metabolism*; D017853:Phosphotransferases (Alcohol Group Acceptor) / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction; D010738:Type C Phospholipases / Q000235:genetics / Q000378:metabolism
chemical_list: D010716:Phosphatidylinositols; D049294:Phospholipid Transfer Proteins; D017853:Phosphotransferases (Alcohol Group Acceptor); D051607:CDP-Diacylglycerol-Inositol 3-Phosphatidyltransferase; D010738:Type C Phospholipases
keywords: Phosphatidylinositol transfer proteins; Regulation of lipid kinases; Signaling diversity