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烟曲霉磷酸乙醇胺转移酶基因gpi7是细胞壁GPI锚定蛋白正确运输和极化生长所必需的
Scientific Reports
(
IF
4.6
)
Pub Date : 2019-04-10
, DOI:
10.1038/s41598-019-42344-1
Haomiao Ouyang
,
Ting Du
,
Hui Zhou
,
Iain B. H. Wilson
,
Jinghua Yang
,
Jean-Paul Latgé
,
Cheng Jin
在真菌中,许多蛋白质在维持细胞壁功能和参与致病过程中起着重要作用,它们通过糖基磷脂酰肌醇(GPI)锚定锚定在细胞表面。众所周知,修饰和去除GPI锚的第二个甘露糖残基上的磷酸乙醇胺(EtN-P)对于酵母和哺乳动物细胞中GPI锚蛋白的成熟和分选很重要,但这是某些原生寄生虫所没有的步骤。在引起人为侵袭性曲霉病的机会性真菌病原体烟曲霉中,已知GPI锚定的蛋白与细胞壁合成和毒力有关。在该报告中,研究了编码烟曲霉EtN-P转移酶GPI7的基因。通过删除gpi7基因,我们评估了EtN-P修饰对烟曲霉的形态发生和GPI蛋白定位的影响。我们的结果表明,gpi7基因的缺失导致烟曲霉细胞膜GPI锚定蛋白减少,细胞壁GPI锚定蛋白Mp1的定位错误,极性异常和自噬。我们的结果表明,在GPI锚点上添加第二个甘露糖的EtN-P对转运和定位GPI锚定细胞壁的蛋白质至关重要。
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Aspergillus fumigatus phosphoethanolamine transferase gene gpi7 is required for proper transportation of the cell wall GPI-anchored proteins and polarized growth
In fungi many proteins, which play important roles in maintaining the function of the cell wall and participating in pathogenic processes, are anchored to the cell surface by a glycosylphosphatidylinositol (GPI) anchor. It has been known that modification and removal of phosphoethanolamine (EtN-P) on the second mannose residue in GPI anchors is important for maturation and sorting of GPI anchored proteins in yeast and mammalian cells, but is a step absent from some protist parasites. In Aspergillus fumigatus, an opportunistic fungal pathogen causing invasive aspergillosis in humans, GPI-anchored proteins are known to be involved in cell wall synthesis and virulence. In this report the gene encoding A. fumigatus EtN-P transferase GPI7 was investigated. By deletion of the gpi7 gene, we evaluated the effects of EtN-P modification on the morphogenesis of A. fumigatus and localization of GPI proteins. Our results showed that deletion of the gpi7 gene led to reduced cell membrane GPI anchored proteins, the mis-localization of the cell wall GPI anchored protein Mp1, abnormal polarity, and autophagy in A. fumigatus. Our results suggest that addition of EtN-P of the second mannose on the GPI anchor is essential for transportation and localization of the cell wall GPI-anchored proteins.
更新日期:2019-04-10