Interaction of Pik1p and Sjl proteins in membrane trafficking.
Interaction of Pik1p and Sjl proteins in membrane trafficking.
复制标题
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
中科院分区:
文献类型:
--
作者:
Nguyen,PeterH;Hasek,Jiri;Kohlwein,SeppD;Romero,Carlos;Choi,JaeH;Vancura,Ales
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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影响因子:
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作者:
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影响因子:
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作者:
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DOI:
--
发表时间:
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期刊:
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影响因子:
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作者:
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通讯作者:
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