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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Distinct functional units of the Golgi complex in Drosophila cells
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Distinct functional units of the Golgi complex in Drosophila cells

机译:果蝇细胞中高尔基复合体的不同功能单元

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摘要

A striking variety of glycosylation occur in the Golgi complex in a protein-specific manner, but how this diversity and specificity are achieved remains unclear. Here we show that stacked fragments (units) of the Golgi complex dispersed in Drosophila imaginal disk cells are functionally diverse. The UDP-sugar transporter FRINGE-CONNECTION (FRC) is localized to a subset of the Golgi units distinct from those harboring SULFATELESS (SFL), which modifies glucosaminoglycans (GAGs), and from those harboring the protease RHOMBOID (RHO), which processes the glycoprotein SPITZ (SPI). Whereas the glycosylation and function of NOTCH are affected in imaginal disks of frc mutants, those of SPI and of GAG core proteins are not, even though FRC transports a broad range of glycosylation substrates, suggesting that Golgi units containing FRC and those containing SFL or RHO are functionally separable. Distinct Golgi units containing FRC and RHO in embryos could also be separated biochemically by immunoisolation techniques. We also show that Tn-antigen glycan is localized only in a subset of the Golgi units distributed basally in a polarized cell. We propose that the different localizations among distinct Golgi units of molecules involved in glycosylation underlie the diversity of glycan modification.
机译:高尔基体复合物中以蛋白特异性方式发生了惊人的糖基化变化,但是如何实现这种多样性和特异性仍不清楚。在这里,我们显示果蝇假想盘细胞中分散的高尔基体的堆叠的片段(单位)是功能多样的。 UDP糖转运蛋白边缘连接(FRC)定位于高尔基单元的一个子集,该单元不同于带有SULFATELESS(SFL)和糖蛋白RHOMBOID(RHO)的糖基,其中SULFATELESS(SFL)修饰了葡糖胺聚糖(GAG)。糖蛋白SPITZ(SPI)。尽管frc突变体的假想圆盘中NOTCH的糖基化和功能受到影响,但SPI和GAG核心蛋白的虚构圆盘均不受影响,即使FRC转运了广泛的糖基化底物,这表明含有FRC的高尔基单元以及含有SFL或RHO的高尔基单元在功能上是可分离的。胚胎中含有FRC和RHO的不同高尔基单元也可以通过免疫分离技术进行生化分离。我们还显示,Tn抗原聚糖仅位于极化细胞中基本分布的高尔基单元的一个子集中。我们提出,参与糖基化的分子的不同高尔基单元之间的不同定位是聚糖修饰的多样性的基础。

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