Assembly of the PtdIns 4-kinase Stt4 complex at the plasma membrane requires Ypp1 and Efr3.

Assembly of the PtdIns 4-kinase Stt4 complex at the plasma membrane requires Ypp1 and Efr3.
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DOI:
10.1083/jcb.200804003
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发表时间:
2008-12-15
影响因子:
7.8
通讯作者:
Emr, Scott D.
Emr, Scott D.
中科院分区:
生物学1区
文献类型:
--
作者:
Baird, Dan;Stefan, Chris;Audhya, Anjon;Weys, Sabine;Emr, Scott D.

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磷酸肌醇磷脂酰肌醇4-磷酸(PtdIns 4P)是调节肌动蛋白细胞骨架的分泌和极化的必需信号脂质。在酿酒酵母中,PtdIns 4-激酶Stt 4催化PtdIns 4P在质膜(PM)处的合成。在本文中,我们确定和表征两个新的调节组分的Stt 4激酶复合物,Ypp 1和Efr 3。必需基因YPP 1编码一种保守的蛋白质,该蛋白质与Stt 4共定位于皮质点状结构并调节该脂质激酶的稳定性。因此,Ypp 1与Stt 4上的不同区域相互作用,这些区域是将多个激酶拷贝组装和募集到磷酸肌醇激酶(PIK)斑块中所必需的。我们确定的膜蛋白Efr 3作为一个额外的组成部分的Stt 4 PIK补丁。Efr 3是必不可少的组装Ypp 1和Stt 4在PIK补丁。我们的结论是,Ypp 1和Efr 3的形成和结构所需的Stt 4 PIK补丁,并最终PM为基础的PtdIns 4P信号。
The phosphoinositide phosphatidylinositol 4-phosphate (PtdIns4P) is an essential signaling lipid that regulates secretion and polarization of the actin cytoskeleton. In Saccharomyces cerevisiae, the PtdIns 4-kinase Stt4 catalyzes the synthesis of PtdIns4P at the plasma membrane (PM). In this paper, we identify and characterize two novel regulatory components of the Stt4 kinase complex, Ypp1 and Efr3. The essential gene YPP1 encodes a conserved protein that colocalizes with Stt4 at cortical punctate structures and regulates the stability of this lipid kinase. Accordingly, Ypp1 interacts with distinct regions on Stt4 that are necessary for the assembly and recruitment of multiple copies of the kinase into phosphoinositide kinase (PIK) patches. We identify the membrane protein Efr3 as an additional component of Stt4 PIK patches. Efr3 is essential for assembly of both Ypp1 and Stt4 at PIK patches. We conclude that Ypp1 and Efr3 are required for the formation and architecture of Stt4 PIK patches and ultimately PM-based PtdIns4P signaling.
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