A phosphatidylinositol transfer protein integrates phosphoinositide signaling with lipid droplet metabolism to regulate a developmental program of nutrient stress-induced membrane biogenesis

作者：Ren Jihui^*; Lin Coney Pei Chen; Pathak Manish C; Temple Brenda R S; Nile Aaron H; Mousley Carl J; Duncan Mara C; Eckert Debra M; Leiker Thomas J; Ivanova Pavlina T; Myers David S; Murphy Robert C; Brown H Alex; Verdaasdonk Jolien; Bloom Kerry S; Ortlund Eric A; Neiman Aaron M; Bankaitis Vytas A

来源：Molecular Biology of the Cell, 2014, 25(5): 712-727.

DOI：10.1091/mbc.E13-11-0634

Lipid droplet (LD) utilization is an important cellular activity that regulates energy balance and release of lipid second messengers. Because fatty acids exhibit both beneficial and toxic properties, their release from LDs must be controlled. Here we demonstrate that yeast Sfh3, an unusual Sec14-like phosphatidylinositol transfer protein, is an LD-associated protein that inhibits lipid mobilization from these particles. We further document a complex biochemical diversification of LDs during sporulation in which Sfh3 and select other LD proteins redistribute into discrete LD subpopulations. The data show that Sfh3 modulates the efficiency with which a neutral lipid hydrolase-rich LD subclass is consumed during biogenesis of specialized membrane envelopes that package replicated haploid meiotic genomes. These results present novel insights into the interface between phosphoinositide signaling and developmental regulation of LD metabolism and unveil meiosis-specific aspects of Sfh3 (and phosphoinositide) biology that are invisible to contemporary haploid-centric cell biological, proteomic, and functional genomics approaches.

• 出版日期2014-3-1