Expression of yeast lipid phosphatase Sac1p is regulated by phosphatidylinositol-4-phosphate.

Expression of yeast lipid phosphatase Sac1p is regulated by phosphatidylinositol-4-phosphate.
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DOI:
10.1186/1471-2199-9-16
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发表时间:
2008-01-28
影响因子:
--
通讯作者:
Mayinger P
Mayinger P
中科院分区:
生物3区
文献类型:
--
作者:
Knödler A;Konrad G;Mayinger P

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磷酸肌醇在调节细胞内膜的过程中起核心作用。在酵母中,大量磷脂生物合成酶使用共同的转录调节机制。然而,编码脂质激酶和磷酸酶的基因的表达是如何调节的仍然是未知的。在这里,我们表明,在酵母酿酒酵母中的脂质磷酸酶Sac 1 p的表达调节磷脂酰肌醇-4-磷酸(PI(4)P)浓度的变化。与编码参与磷脂生物合成的酶的基因不同,SAC 1基因的表达不依赖于肌醇水平。我们在SAC 1的5'非翻译区(5'-UTR)内鉴定了一个新的9-bp基序,该基序负责PI(4)P介导的调节。SAC 1启动子活性的上调与Sac 1蛋白水平的升高相关。通过主要底物PI(4)P的浓度调节Sac 1 p表达,可确保PI(4)P的隔室特异性池得到适当维持。
Phosphoinositides play a central role in regulating processes at intracellular membranes. In yeast, a large number of phospholipid biosynthetic enzymes use a common mechanism for transcriptional regulation. Yet, how the expression of genes encoding lipid kinases and phosphatases is regulated remains unknown. Here we show that the expression of lipid phosphatase Sac1p in the yeast Saccharomyces cerevisiae is regulated in response to changes in phosphatidylinositol-4-phosphate (PI(4)P) concentrations. Unlike genes encoding enzymes involved in phospholipid biosynthesis, expression of the SAC1 gene is independent of inositol levels. We identified a novel 9-bp motif within the 5' untranslated region (5'-UTR) of SAC1 that is responsible for PI(4)P-mediated regulation. Upregulation of SAC1 promoter activity correlates with elevated levels of Sac1 protein levels. Regulation of Sac1p expression via the concentration of its major substrate PI(4)P ensures proper maintenance of compartment-specific pools of PI(4)P.
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