A diacidic motif determines unconventional secretion of wild-type and ALS-linked mutant SOD1.

A diacidic motif determines unconventional secretion of wild-type and ALS-linked mutant SOD1.
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DOI:
10.1083/jcb.201704056
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发表时间:
2017-09-04
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Malhotra V
Malhotra V
中科院分区:
其他
文献类型:
--
作者:
Cruz-Garcia D;Brouwers N;Duran JM;Mora G;Curwin AJ;Malhotra V

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饥饿诱导的非常规分泌Acb 1需要ESCRT-I,-II和-III和Grh 1。Cruz-Garcia等人报道,与肌萎缩侧索硬化症相关的SOD 1及其突变形式也在营养饥饿时以Grh 1和ESCRT-I-、-II-和-III依赖性过程分泌。作者在Acb 1和SOD 1中确定了一个保守的二元酸基序,这是它们在酵母和人类细胞中出口所必需的。营养饥饿特定的非常规分泌的Acb 1在酿酒酵母需要ESCRT-I,-II,和-III和Grh 1。在这项研究中,我们报告说,另一个信号序列缺乏细胞质蛋白,超氧化物歧化酶1(SOD 1),其突变形式与肌萎缩侧索硬化症(ALS),也分泌酵母营养饥饿后,在Grh 1和ESCRT-I-,-II-和-III-依赖的过程。我们的分析表明,在这些蛋白质中的保守的二元酸基序(Asp-Glu)是必要的出口。重要的是,人细胞中野生型人SOD 1和ALS连锁突变体的分泌也需要二酸残基。总而言之,这些发现揭示了编码在细胞质蛋白质内的信息,这些蛋白质是其非常规分泌所需的,并提供了一种手段来阐明细胞质与分泌形式的突变SOD 1在ALS病理学中的意义。我们还提出了细胞如何基于信号诱导的细胞质生理变化,选择一小部分细胞质蛋白进行非常规分泌。
Starvation-induced unconventional secretion of Acb1 requires ESCRT-I, -II, and -III and Grh1. Cruz-Garcia et al. report that SOD1 and its mutant form linked to amyotrophic lateral sclerosis are also secreted upon nutrient starvation in a Grh1- and ESCRT-I–, -II–, and -III–dependent process. The authors identify a conserved diacidic motif in Acb1 and SOD1 that is necessary for their export in yeast and human cells. The nutrient starvation-specific unconventional secretion of Acb1 in Saccharomyces cerevisiae requires ESCRT-I, -II, and -III and Grh1. In this study, we report that another signal sequence lacking cytoplasmic protein, superoxide dismutase 1 (SOD1), and its mutant form linked to amyotrophic lateral sclerosis (ALS), is also secreted by yeast upon nutrient starvation in a Grh1- and ESCRT-I–, -II–, and -III–dependent process. Our analyses reveal that a conserved diacidic motif (Asp-Glu) in these proteins is necessary for their export. Importantly, secretion of wild-type human SOD1 and the ALS-linked mutant in human cells also require the diacidic residues. Altogether, these findings reveal information encoded within the cytoplasmic proteins required for their unconventional secretion and provide a means to unravel the significance of the cytoplasmic versus the secreted form of mutant SOD1 in the pathology of ALS. We also propose how cells, based on a signal-induced change in cytoplasmic physiology, select a small pool of a subset of cytoplasmic proteins for unconventional secretion.
DOI: 10.1083/jcb.201106098
发表时间: 2011-12-12
期刊: The Journal of cell biology
影响因子: --
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