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首页> 外文期刊>Journal of Lipid Research >Hypoxia-inducible lipid droplet-associated protein inhibits adipose triglyceride lipase
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Hypoxia-inducible lipid droplet-associated protein inhibits adipose triglyceride lipase

机译:低氧诱导的脂质滴相关蛋白抑制脂肪甘油三酯脂肪酶

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Elaborate control mechanisms of intracellular triacylglycerol (TAG) breakdown are critically involved in the maintenance of energy homeostasis. Hypoxia-inducible lipid droplet-associated protein (HILPDA)/hypoxia-inducible gene-2 (Hig-2) has been shown to affect intracellular TAG levels, yet, the underlying molecular mechanisms are unclear. Here, we show that HILPDA inhibits adipose triglyceride lipase (ATGL), the enzyme catalyzing the first step of intracellular TAG hydrolysis. HILPDA shares structural similarity with G0/G1 switch gene 2 (G0S2), an established inhibitor of ATGL. HILPDA inhibits ATGL activity in a dose-dependent manner with an IC50 value of [~]2 M. ATGL inhibition depends on the direct physical interaction of both proteins and involves the N-terminal hydrophobic region of HILPDA and the N-terminal patatin domain-containing segment of ATGL. Finally, confocal microscopy combined with Forster resonance energy transfer-fluorescence lifetime imaging microscopy analysis indicated that HILPDA and ATGL colocalize and physically interact intracellularly. These findings provide a rational biochemical explanation for the tissue-specific increased TAG accumulation in HILPDA-overexpressing transgenic mouse models.
机译:精细的细胞内三酰甘油(TAG)分解控制机制与能量稳态的维持密切相关。缺氧诱导脂质滴相关蛋白(HILPDA)/缺氧诱导基因2(Hig-2)已被证明会影响细胞内TAG的水平,但潜在的分子机制尚不清楚。在这里,我们显示HILPDA抑制甘油三酸酯脂肪酶(ATGL),该酶催化细胞内TAG水解的第一步。 HILPDA与已建立的ATGL抑制剂G0 / G1转换基因2(G0S2)具有结构相似性。 HILPDA以剂量依赖性方式抑制ATGL活性,IC50值为[〜] 2M。ATGL抑制取决于这两种蛋白质的直接物理相互作用,并涉及HILPDA的N端疏水区和N端patatin域-包含ATGL的部分。最后,共聚焦显微镜与Forster共振能量转移荧光寿命成像显微镜分析相结合,表明HILPDA和ATGL共定位并在细胞内发生物理相互作用。这些发现为在过表达HILPDA的转基因小鼠模型中组织特异性增加的TAG积累提供了合理的生化解释。

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