Perilipin1 promotes unilocular lipid droplet formation through the activation of Fsp27 in adipocytes.

Perilipin1 promotes unilocular lipid droplet formation through the activation of Fsp27 in adipocytes.
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Perilipin1 通过激活脂肪细胞中的 Fsp27 促进单房脂滴形成

DOI:
10.1038/ncomms2581
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发表时间:
2013
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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成熟的白色脂肪细胞含有特征性的单室脂滴。然而,单室脂滴形成的分子机制知之甚少。我们以前表明,Fsp 27,脂肪细胞特异性脂滴相关蛋白,通过启动脂质交换和转移促进脂滴生长。在这里,我们确定Perilipin 1(Plin 1),另一种脂肪细胞特异性脂滴相关蛋白,作为Fsp 27激活剂。Plin 1与Fsp 27的CIDE-N结构域相互作用,并显著增加Fsp 27介导的脂质交换、脂质转移和脂滴生长。Plin 1和Fsp 27之间的功能合作是脂肪细胞中有效的脂滴生长所必需的,因为任何一种蛋白质的耗尽都会损害脂滴生长。Fsp 27的CIDE-N结构域形成同源二聚体,并且CIDE-N同源二聚化的破坏消除了Fsp 27介导的脂质交换和转移。有趣的是,Plin 1可以恢复Fsp 27的CIDE-N同源二聚化缺陷突变体的活性。因此,我们揭示了一种新的机制,潜在的脂滴生长和单室脂滴的形成,涉及Fsp 27和Plin 1在脂肪细胞中的协同作用。
Mature white adipocytes contain a characteristic unilocular lipid droplet. However, the molecular mechanisms underlying unilocular lipid droplet formation are poorly understood. We previously showed that Fsp27, an adipocyte-specific lipid droplet-associated protein, promotes lipid droplet growth by initiating lipid exchange and transfer. Here, we identify Perilipin1 (Plin1), another adipocyte-specific lipid droplet-associated protein, as an Fsp27 activator. Plin1 interacts with the CIDE-N domain of Fsp27 and markedly increases Fsp27-mediated lipid exchange, lipid transfer and lipid droplet growth. Functional cooperation between Plin1 and Fsp27 is required for efficient lipid droplet growth in adipocytes, as depletion of either protein impairs lipid droplet growth. The CIDE-N domain of Fsp27 forms homodimers and disruption of CIDE-N homodimerization abolishes Fsp27-mediated lipid exchange and transfer. Interestingly, Plin1 can restore the activity of CIDE-N homodimerization-defective mutants of Fsp27. We thus uncover a novel mechanism underlying lipid droplet growth and unilocular lipid droplet formation that involves the cooperative action of Fsp27 and Plin1 in adipocytes.
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