Intracellular lipid surveillance by small G protein geranylgeranylation.

Intracellular lipid surveillance by small G protein geranylgeranylation.
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DOI:
10.1038/s41586-022-04729-7
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发表时间:
2022-05
期刊:
影响因子:
64.8
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--
中科院分区:
综合性期刊1区
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脂质体内平衡的不平衡可能对健康产生有害影响。然而,细胞如何感知由于脂质耗尽而产生的代谢需求并通过增加营养吸收来做出反应仍不清楚。在这里,我们描述了一种机制,在秀丽隐杆线虫的细胞内脂质监视,涉及核激素受体NHR-49的转录失活,通过其胞质螯合内吞囊泡通过geranylgeranyl共轭的小G蛋白RAB-11.1。脂质耗竭引起的类异戊二烯从头合成缺陷限制了RAB-11.1香叶基香叶基化,其促进NHR-49的核转位和rab-11.2转录的激活以增强转运蛋白在质膜上的驻留。因此,我们确定了一个关键的脂质检测的细胞,其共轭G蛋白,和核受体的动态相互作用,使细胞能够感知代谢需求,由于脂质消耗和响应增加营养吸收和脂质代谢。
Imbalances in lipid homeostasis can have deleterious effects on health. Yet how cells sense metabolic demand due to lipid depletion and respond by increasing nutrient absorption remains unclear. Here we describe a mechanism for intracellular lipid surveillance in Caenorhabditis elegans that involves transcriptional inactivation of the nuclear hormone receptor NHR-49 through its cytosolic sequestration to endocytic vesicles via geranylgeranyl conjugation to the small G protein RAB-11.1. Defective de novo isoprenoid synthesis caused by lipid depletion limits RAB-11.1 geranylgeranylation, which promotes nuclear translocation of NHR-49 and activation of rab-11.2 transcription to enhance transporter residency at the plasma membrane. Thus, we identify a critical lipid sensed by the cell, its conjugated G protein, and the nuclear receptor whose dynamic interactions enable cells to sense metabolic demand due to lipid depletion and respond by increasing nutrient absorption and lipid metabolism.
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