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2015 ; 26
(4
): 726-39
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Seipin performs dissectible functions in promoting lipid droplet biogenesis and
regulating droplet morphology
#MMPMID25540432
Cartwright BR
; Binns DD
; Hilton CL
; Han S
; Gao Q
; Goodman JM
Mol Biol Cell
2015[Feb]; 26
(4
): 726-39
PMID25540432
show ga
Seipin is necessary for both adipogenesis and lipid droplet (LD) organization in
nonadipose tissues; however, its molecular function is incompletely understood.
Phenotypes in the seipin-null mutant of Saccharomyces cerevisiae include aberrant
droplet morphology (endoplasmic reticulum-droplet clusters and size
heterogeneity) and sensitivity of droplet size to changes in phospholipid
synthesis. It has not been clear, however, whether seipin acts in initiation of
droplet synthesis or at a later step. Here we utilize a system of de novo droplet
formation to show that the absence of seipin results in a delay in droplet
appearance with concomitant accumulation of neutral lipid in membranes. We also
demonstrate that seipin is required for vectorial budding of droplets toward the
cytoplasm. Furthermore, we find that the normal rate of droplet initiation
depends on 14 amino acids at the amino terminus of seipin, deletion of which
results in fewer, larger droplets that are consistent with a delay in initiation
but are otherwise normal in morphology. Importantly, other functions of seipin,
namely vectorial budding and resistance to inositol, are retained in this mutant.
We conclude that seipin has dissectible roles in both promoting early LD
initiation and in regulating LD morphology, supporting its importance in LD
biogenesis.
|*Lipid Metabolism
[MESH]
|Cytoplasm/metabolism/ultrastructure
[MESH]
|Endoplasmic Reticulum/metabolism
[MESH]
|GTP-Binding Protein gamma Subunits/genetics/metabolism/*physiology
[MESH]