FIT2 is an acyl-coenzyme A diphosphatase crucial for endoplasmic reticulum homeostasis.
FIT2 is an acyl-coenzyme A diphosphatase crucial for endoplasmic reticulum homeostasis.
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DOI:
10.1083/jcb.202006111
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发表时间:
2020-10-05
期刊:
影响因子:
--
通讯作者:
Farese RV Jr
中科院分区:
文献类型:
--
作者:
Becuwe M;Bond LM;Pinto AFM;Boland S;Mejhert N;Elliott SD;Cicconet M;Graham MM;Liu XN;Ilkayeva O;Saghatelian A;Walther TC;Farese RV Jr
FIT2 is a protein important for ER lipid metabolism and lipid droplet formation, but its function has remained mysterious. Becuwe et al. show that FIT2 is an acyl coenzyme A diphosphatase, and this activity is crucial for ER homeostasis and cellular lipid storage. The endoplasmic reticulum is a cellular hub of lipid metabolism, coordinating lipid synthesis with continuous changes in metabolic flux. Maintaining ER lipid homeostasis despite these fluctuations is crucial to cell function and viability. Here, we identify a novel mechanism that is crucial for normal ER lipid metabolism and protects the ER from dysfunction. We identify the molecular function of the evolutionarily conserved ER protein FIT2 as a fatty acyl–coenzyme A (CoA) diphosphatase that hydrolyzes fatty acyl–CoA to yield acyl 4′-phosphopantetheine. This activity of FIT2, which is predicted to be active in the ER lumen, is required in yeast and mammalian cells for maintaining ER structure, protecting against ER stress, and enabling normal lipid storage in lipid droplets. Our findings thus solve the long-standing mystery of the molecular function of FIT2 and highlight the maintenance of optimal fatty acyl–CoA levels as key to ER homeostasis.
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DOI:
10.15698/mic2018.02.614
发表时间:
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期刊:
Microbial cell (Graz, Austria)
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发表时间:
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期刊:
The Journal of cell biology
影响因子:
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通讯作者:
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