TIP47 functions in the biogenesis of lipid droplets.

TIP47 functions in the biogenesis of lipid droplets.
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DOI:
10.1083/jcb.200812042
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发表时间:
2009-05-18
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Höning S
Höning S
中科院分区:
其他
文献类型:
--
作者:
Bulankina AV;Deggerich A;Wenzel D;Mutenda K;Wittmann JG;Rudolph MG;Burger KN;Höning S

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TIP 47(47 kD的尾相互作用蛋白)被表征为甘露糖6-磷酸受体(MPR)的货物选择装置,指导其从内体转运到trans-Golgi网络。相比之下,我们目前的分析表明,胞质TIP 47不招募到生物合成和内吞途径的细胞器。TIP 47表达的敲低对MPR分布或运输没有影响,也不影响溶酶体酶分选。因此,我们的数据反对TIP 47作为分选装置的功能。相反,TIP 47通过包含11-mer重复的氨基末端序列募集到脂滴(LD)。我们发现,TIP 47具有载脂蛋白样的性质,并重组脂质体成小的脂质盘。TIP 47的抑制阻断了LD的成熟,并减少了三酰甘油掺入LD。我们的结论是,TIP 47功能的LD的生物发生。
TIP47 (tail-interacting protein of 47 kD) was characterized as a cargo selection device for mannose 6-phosphate receptors (MPRs), directing their transport from endosomes to the trans-Golgi network. In contrast, our current analysis shows that cytosolic TIP47 is not recruited to organelles of the biosynthetic and endocytic pathways. Knockdown of TIP47 expression had no effect on MPR distribution or trafficking and did not affect lysosomal enzyme sorting. Therefore, our data argue against a function of TIP47 as a sorting device. Instead, TIP47 is recruited to lipid droplets (LDs) by an amino-terminal sequence comprising 11-mer repeats. We show that TIP47 has apolipoprotein-like properties and reorganizes liposomes into small lipid discs. Suppression of TIP47 blocked LD maturation and decreased the incorporation of triacylglycerol into LDs. We conclude that TIP47 functions in the biogenesis of LDs.
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