The Inner Nuclear Membrane Is a Metabolically Active Territory that Generates Nuclear Lipid Droplets.
Cell
; 174(3): 700-715.e18, 2018 07 26.
Article
em En
| MEDLINE
| ID: mdl-29937227
ABSTRACT
The inner nuclear membrane (INM) encases the genome and is fused with the outer nuclear membrane (ONM) to form the nuclear envelope. The ONM is contiguous with the endoplasmic reticulum (ER), the main site of phospholipid synthesis. In contrast to the ER and ONM, evidence for a metabolic activity of the INM has been lacking. Here, we show that the INM is an adaptable membrane territory capable of lipid metabolism. S. cerevisiae cells target enzymes to the INM that can promote lipid storage. Lipid storage involves the synthesis of nuclear lipid droplets from the INM and is characterized by lipid exchange through Seipin-dependent membrane bridges. We identify the genetic circuit for nuclear lipid droplet synthesis and a role of these organelles in regulating this circuit by sequestration of a transcription factor. Our findings suggest a link between INM metabolism and genome regulation and have potential relevance for human lipodystrophy.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Gotículas Lipídicas
/
Lipídeos de Membrana
/
Membrana Nuclear
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Cell
Ano de publicação:
2018
Tipo de documento:
Article
País de afiliação:
Áustria