Interaction of Pik1p and Sjl proteins in membrane trafficking.

Interaction of Pik1p and Sjl proteins in membrane trafficking.
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Pik1p 和 Sjl 蛋白在膜运输中的相互作用。

DOI:
10.1016/j.femsyr.2004.09.007
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发表时间:
2005
影响因子:
3.2
通讯作者:
Vancura,Ales
Vancura,Ales
中科院分区:
生物学4区
文献类型:
--
作者:
Nguyen,PeterH;Hasek,Jiri;Kohlwein,SeppD;Romero,Carlos;Choi,JaeH;Vancura,Ales

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磷脂酰肌醇(PtdIns)磷酸参与信号转导,细胞骨架组织和膜运输。PtdIns 4-phosphate [PtdIns(4)P]是由PtdIns 4-kinase(Pik 1 p)在酵母中产生的,似乎调节高尔基体的分泌功能。PtdIns(4)P也是通过磷脂酰肌醇4,5-二磷酸[PtdIns(4,5)P2]的去磷酸化产生的,由三种酵母Sjl蛋白之一催化,其是哺乳动物突触囊泡相关PtdIns(4,5)P25-磷酸酶synaptojanin的同系物。为了确定Pik 1 p和Sjl蛋白是否在相同的途径中运作或调节相同的过程,我们使用了遗传方法。PIK 1基因突变显示与单个SJL基因缺失的合成遗传相互作用。SJL 3基因的缺失对pik 1 ts具有综合致死性,而pik 1 ts细胞中SJL 1或SJL 2基因的缺失加剧了温度敏感性、新霉素敏感性和转化酶分泌缺陷。pik 1 tssjl 1 Δ和pik 1 tssjl 2 Δ细胞中PtdIns(4)P水平较pik 1 tscell细胞降低,PtdIns(4,5)P2水平升高,表明PtdIns(4)P是分泌所必需的。总的来说,我们的研究结果表明,Pik 1 p和Sjl蛋白协调功能,以调节磷酸肌醇的极性头的动态磷酸化-去磷酸化,这个过程似乎是重要的膜运输途径。
Phosphatidylinositol (PtdIns) phosphates are involved in signal transduction, cytoskeletal organization, and membrane traffic. PtdIns 4-phosphate [PtdIns(4)P], produced in yeast by PtdIns 4-kinase (Pik1p), appears to regulate Golgi secretory function. PtdIns(4)P is also produced by dephosphorylation of phosphatidylinositol 4,5-bisphosphate [PtdIns(4,5)P2], catalyzed by one of the three yeast Sjl proteins, homologs of the mammalian synaptic vesicle-associated PtdIns(4,5)P25-phosphatase, synaptojanin. To determine whether Pik1p and Sjl proteins operate in the same pathway or regulate the same process, we used a genetic approach. Mutation in thePIK1gene displays synthetic genetic interactions with deletions of individualSJLgenes. Deletion ofSJL3gene is synthetically lethal withpik1ts, and deletions ofSJL1orSJL2genes inpik1tscells exacerbate the temperature sensitivity, neomycin sensitivity, and defect in invertase secretion. A diminished level of PtdIns(4)P and increased level of PtdIns(4,5)P2inpik1tssjl1Δ andpik1tssjl2Δ cells, compared withpik1tscells, indicate that PtdIns(4)P is specifically required for secretion. Collectively, our results suggest that Pik1p and the Sjl proteins coordinately function to regulate the dynamic phosphorylation–dephosphorylation of the polar heads of phosphoinositides, and this process appears to be important for membrane trafficking pathways.
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