phospholipid and disassociates with the lipid bilayer. Additionally, the PtdIns and PtdCho affinity of Sec14p has been suggested to act as a localizing force, bringing Sec14p into proximity to the ER or Golgi body where it may aid in the formation of transport vesicles. Cellular In the cell, Sec14p plays an active and regulatory role in the intracellular transport of proteins. A good example of this function is the ability of Sec14p to both transport the phospholipids PtdIns and PtdCho between membranes as well as the inhibition of phospholipase D1 and phospholipase B1, which convert PtdCho to phosphatidic acid and choline or PtdCho to glycerophosphocholine, respectively. Sec14p and its homologs, some of which exhibit activation of phospholipase D1 and B1, aid in phospholipid metabolism regulation in vivo. Additionally, Sec14p is essential in the budding of vesicles from the Golgi body, as it is thought to serve a function related to preserving diacylglycerol concentration in the Golgi body, a compound essential to secretory vesicle biosynthesis. The influence of Sec14p in the localization of lipid rafts is inferred due to abnormal localization and transport of lipid raft localized proteins in mutant yeast strains with non-functional Sec14p. Upon restoration of Sec14p function in these mutant strains, the wayward lipid raft proteins localized to their wild-type location. Experimental evidence suggests Sec14p may play a role in sorting proteins for incorporation into lipid rafts at the Golgi body prior to transport to the plasma membrane. See also CRAL-TRIO Domain References Saccharomyces cerevisiae genes