PAH1-encoded Phosphatidate Phosphatase Plays a Role in the Growth Phase-and Inositol-mediated Regulation of Lipid Synthesis in Saccharomyces cerevisiae

被引:58
|
作者
Pascual, Florencia
Soto-Cardalda, Anibal
Carman, George M.
机构
[1] Rutgers State Univ, Dept Food Sci, Rutgers Ctr Lipid Res, New Brunswick, NJ 08901 USA
[2] Rutgers State Univ, New Jersey Inst Food Nutr & Hlth, New Brunswick, NJ 08901 USA
基金
美国国家卫生研究院;
关键词
Diacylglycerol; Lipids; Phosphatase; Phosphatidate; Phospholipid; Phospholipid Metabolism; Triacylglycerol; Yeast; DIACYLGLYCEROL PYROPHOSPHATE PHOSPHATASE; CYTIDINE DIPHOSPHATE CHOLINE; PHOSPHATIDYLSERINE SYNTHASE ACTIVITY; PROTEIN-INTERACTION NETWORKS; PHOSPHOLIPASE-D ACTIVITY; NUCLEAR-MEMBRANE GROWTH; ENZYMATIC-SYNTHESIS; ESCHERICHIA-COLI; BUDDING YEAST; TRANSCRIPTIONAL REGULATION;
D O I
10.1074/jbc.M113.525766
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Background: Yeast Pah1p phosphatidate phosphatase produces diacylglycerol for triacylglycerol synthesis and controls phosphatidate content for phospholipid synthesis. Results:PAH1 expression was induced throughout growth, stimulated by inositol supplementation, and mediated by the Ino2p/Ino4p/Opi1p regulatory circuit and transcription factors Gis1p and Rph1p. Conclusion: Growth phase- and inositol-mediated expression of PAH1 regulates lipid synthesis. Significance: Pah1p phosphatidate phosphatase is regulated by a transcriptional mechanism throughout growth. In the yeast Saccharomyces cerevisiae, the synthesis of phospholipids in the exponential phase of growth occurs at the expense of the storage lipid triacylglycerol. As exponential phase cells progress into the stationary phase, the synthesis of triacylglycerol occurs at the expense of phospholipids. Early work indicates a role of the phosphatidate phosphatase (PAP) in this metabolism; the enzyme produces the diacylglycerol needed for the synthesis of triacylglycerol and simultaneously controls the level of phosphatidate for the synthesis of phospholipids. Four genes (APP1, DPP1, LPP1, and PAH1) encode PAP activity in yeast, and it has been unclear which gene is responsible for the synthesis of triacylglycerol throughout growth. An analysis of lipid synthesis and composition, as well as PAP activity in various PAP mutant strains, showed the essential role of PAH1 in triacylglycerol synthesis throughout growth. Pah1p is a phosphorylated enzyme whose in vivo function is dependent on its dephosphorylation by the Nem1p-Spo7p protein phosphatase complex. nem1 mutant cells exhibited defects in triacylglycerol synthesis and lipid metabolism that mirrored those imparted by the pah1 mutation, substantiating the importance of Pah1p dephosphorylation throughout growth. An analysis of cells bearing P-PAH1-lacZ and P-PAH1-DPP1 reporter genes showed that PAH1 expression was induced throughout growth and that the induction in the stationary phase was stimulated by inositol supplementation. A mutant analysis indicated that the Ino2p/Ino4p/Opi1p regulatory circuit and transcription factors Gis1p and Rph1p mediated this regulation.
引用
收藏
页码:35781 / 35792
页数:12
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