Fld1p, a functional homologue of human seipin, regulates the size of lipid droplets in yeast.

Fld1p, a functional homologue of human seipin, regulates the size of lipid droplets in yeast.
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DOI:
10.1083/jcb.200711136
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发表时间:
2008-02-11
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Yang H
Yang H
中科院分区:
其他
文献类型:
--
作者:
Fei W;Shui G;Gaeta B;Du X;Kuerschner L;Li P;Brown AJ;Wenk MR;Parton RG;Yang H

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Lipid droplets (LDs) are emerging cellular organelles that are of crucial importance in cell biology and human diseases. In this study, we present our screen of ∼4,700 Saccharomyces cerevisiae mutants for abnormalities in the number and morphology of LDs; we identify 17 fld (few LDs) and 116 mld (many LDs) mutants. One of the fld mutants (fld1) is caused by the deletion of YLR404W, a previously uncharacterized open reading frame. Cells lacking FLD1 contain strikingly enlarged (supersized) LDs, and LDs from fld1Δ cells demonstrate significantly enhanced fusion activities both in vivo and in vitro. Interestingly, the expression of human seipin, whose mutant forms are associated with Berardinelli-Seip congenital lipodystrophy and motoneuron disorders, rescues LD-associated defects in fld1Δ cells. Lipid profiling reveals alterations in acyl chain compositions of major phospholipids in fld1Δ cells. These results suggest that an evolutionally conserved function of seipin in phospholipid metabolism and LD formation may be functionally important in human adipogenesis.
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