PI transfer protein: the specific recognition of phospholipids and its functions.
Phosphatidylinositol transfer proteins (PITPs) can bind specifically and transfer a single phosphatidylinositol (PI) molecule between phospholipid membranes in an ATP-independent manner in vitro. PITPs exist in all the eukaryotic systems from yeast to human. PITP plays an essential role in intracellular vesicle flow and inositol lipid signaling. The crystal structure of yeast PITP Sec14p reveals a large hydrophobic pocket to accommodate the acyl chains of phospholipid molecules. At the opening of the pocket, a hydrogen bond network may render Sec14p the binding specificity to PI molecules. The structure suggests that the PI-binding ability may play an important role in the in vivo function of PITPs.
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Center for Macromolecular Crystallography, University of Alabama at Birmingham, Birmingham, AL 35294-0005, USA.
Luo
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D000255:Adenosine Triphosphate / Q000494:pharmacology; D000818:Animals; D001665:Binding Sites; D002352:Carrier Proteins / Q000737:chemistry* / Q000378:metabolism*; D018360:Crystallography, X-Ray; D006801:Humans; D006860:Hydrogen Bonding; D008565:Membrane Proteins; D008958:Models, Molecular; D015394:Molecular Structure; D010716:Phosphatidylinositols / Q000378:metabolism; D049294:Phospholipid Transfer Proteins
D002352:Carrier Proteins; D008565:Membrane Proteins; D010716:Phosphatidylinositols; D049294:Phospholipid Transfer Proteins; D000255:Adenosine Triphosphate