mmBCFA C17iso ensures endoplasmic reticulum integrity for lipid droplet growth.

mmBCFA C17iso ensures endoplasmic reticulum integrity for lipid droplet growth.
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mmBCFA C17iso 确保内质网完整性以促进脂滴生长

DOI:
10.1083/jcb.202102122
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发表时间:
2021-11-01
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Liang B
Liang B
中科院分区:
其他
文献类型:
--
作者:
Zhang J;Hu Y;Wang Y;Fu L;Xu X;Li C;Xu J;Li C;Zhang L;Yang R;Jiang X;Wu Y;Liu P;Zou X;Liang B

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本研究描述了一种独特的单甲基支链脂肪酸,C17异,作为磷脂的侧链,以确保内质网的完整性,在一个完整的生物体,秀丽隐杆线虫的脂滴生长。在真核生物细胞中,脂滴(LDs)是动态调节细胞能量稳态的关键细胞器。LD起源于ER,并在其生长过程中持续接触ER。ER如何影响LD生长在很大程度上是未知的。在这里,我们表明,RNA干扰敲低acs-1,编码一个酰基辅酶A合成酶所需的单甲基支链脂肪酸C15 iso和C17 iso的生物合成,显着地防止LD生长秀丽隐杆线虫。饮食C17 iso,或与C17 iso包括磷脂酰胆碱,磷脂酰乙醇胺,和三酰甘油的复合脂质,可以完全恢复在acs-1 RNAi蠕虫的LD生长。从机制上讲,C17 iso可以掺入磷脂中以确保ER的膜完整性,从而维持ER驻留酶如SCD/硬脂酰辅酶A去饱和酶和DGAT 2/二酰基甘油酰基转移酶的功能,以进行适当的脂质合成和LD生长。总的来说,我们的工作揭示了一个独特的脂肪酸,C17异,作为侧链的磷脂决定ER稳态的LD生长在一个完整的有机体,C。优美的
This study describes a unique monomethyl branched-chain fatty acid, C17iso, as the side chain of phospholipids to ensure endoplasmic reticulum integrity for lipid droplet growth in an intact organism, Caenorhabditis elegans. In eukaryote cells, lipid droplets (LDs) are key intracellular organelles that dynamically regulate cellular energy homeostasis. LDs originate from the ER and continuously contact the ER during their growth. How the ER affects LD growth is largely unknown. Here, we show that RNAi knockdown of acs-1, encoding an acyl-CoA synthetase required for the biosynthesis of monomethyl branched-chain fatty acids C15iso and C17iso, remarkably prevented LD growth in Caenorhabditis elegans. Dietary C17iso, or complex lipids with C17iso including phosphatidylcholine, phosphatidylethanolamine, and triacylglycerol, could fully restore the LD growth in the acs-1RNAi worms. Mechanistically, C17iso may incorporate into phospholipids to ensure the membrane integrity of the ER so as to maintain the function of ER-resident enzymes such as SCD/stearoyl-CoA desaturase and DGAT2/diacylglycerol acyltransferase for appropriate lipid synthesis and LD growth. Collectively, our work uncovers a unique fatty acid, C17iso, as the side chain of phospholipids for determining the ER homeostasis for LD growth in an intact organism, C. elegans.
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