The yeast lipin orthologue Pah1p is important for biogenesis of lipid droplets.

The yeast lipin orthologue Pah1p is important for biogenesis of lipid droplets.
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DOI:
10.1083/jcb.201010111
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发表时间:
2011-03-21
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Goodman JM
Goodman JM
中科院分区:
其他
文献类型:
--
作者:
Adeyo O;Horn PJ;Lee S;Binns DD;Chandrahas A;Chapman KD;Goodman JM

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Pah1p促进脂滴组装独立于其在三酰甘油合成中的作用。脂蛋白是产生二酰基甘油(DAG)的磷脂酸磷酸酶。在这项研究中,我们报告,酵母脂蛋白,Pah1p,控制胞质脂滴的形成。PAH1的破坏导致液滴数量减少63%,但总中性脂质水平没有变化。这伴随着中性脂质在内质网(ER)中的积累。液滴生物发生缺陷不是中性脂质比例改变的结果。当在葡萄糖培养基中生长时,在不存在PAH 1和甾醇酰基转移酶的情况下没有可见的液滴,即使该菌株产生与野生型一样多的三酰甘油。正常液滴形成所需的PAH 1可以通过DGK1的敲除而绕过。Nem1p是Pah1p的激活剂,定位于ER上每个细胞的单个点,通常靠近液滴,这表明它是液滴组装的位点。总的来说,这项研究提供了强有力的证据表明,DAG产生的Pah1p是重要的液滴生物发生。
Pah1p promotes lipid droplet assembly independent of its role in triacylglycerol synthesis. Lipins are phosphatidate phosphatases that generate diacylglycerol (DAG). In this study, we report that yeast lipin, Pah1p, controls the formation of cytosolic lipid droplets. Disruption of PAH1 resulted in a 63% decrease in droplet number, although total neutral lipid levels did not change. This was accompanied by an accumulation of neutral lipids in the endoplasmic reticulum (ER). The droplet biogenesis defect was not a result of alterations in neutral lipid ratios. No droplets were visible in the absence of both PAH1 and steryl acyltransferases when grown in glucose medium, even though the strain produces as much triacylglycerol as wild type. The requirement of PAH1 for normal droplet formation can be bypassed by a knockout of DGK1. Nem1p, the activator of Pah1p, localizes to a single punctum per cell on the ER that is usually next to a droplet, suggesting that it is a site of droplet assembly. Overall, this study provides strong evidence that DAG generated by Pah1p is important for droplet biogenesis.
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