A role for BiP as an adjustor for the endoplasmic reticulum stress-sensing protein Ire1.

A role for BiP as an adjustor for the endoplasmic reticulum stress-sensing protein Ire1.
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DOI:
10.1083/jcb.200405153
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发表时间:
2004-11-08
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Kohno K
Kohno K
中科院分区:
其他
文献类型:
--
作者:
Kimata Y;Oikawa D;Shimizu Y;Ishiwata-Kimata Y;Kohno K

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在未折叠的蛋白反应中,I型跨膜蛋白IRE1将内质网(ER)应激信号传递到细胞质。我们以前报道过,在非应激条件下,内质网伴侣蛋白Bip结合并抑制IRE1。目前尚不清楚这一事件如何对IRE1的整体调控做出贡献。目前的IRE1突变研究表明,腔结构域具有两个似乎对活性不可或缺的亚区。Bip结合位点不是分配给这些亚区,而是分配给跨膜结构域附近的一个区域。对几个在不可或缺的亚区携带缺失的IRE1突变体的表型比较表明,这些亚区负责多个事件,这些事件是整个IRE1蛋白激活的先决条件。出乎意料的是,Bip结合位点的缺失使得IRE1在内质网应激诱导中没有改变,但对乙醇和高温超敏。我们的结论是,在内质网应激-感觉系统中,BiP不是IRE1活性的主要决定因素,而是对各种应激的敏感性的调节器。
In the unfolded protein response, the type I transmembrane protein Ire1 transmits an endoplasmic reticulum (ER) stress signal to the cytoplasm. We previously reported that under nonstressed conditions, the ER chaperone BiP binds and represses Ire1. It is still unclear how this event contributes to the overall regulation of Ire1. The present Ire1 mutation study shows that the luminal domain possesses two subregions that seem indispensable for activity. The BiP-binding site was assigned not to these subregions, but to a region neighboring the transmembrane domain. Phenotypic comparison of several Ire1 mutants carrying deletions in the indispensable subregions suggests these subregions are responsible for multiple events that are prerequisites for activation of the overall Ire1 proteins. Unexpectedly, deletion of the BiP-binding site rendered Ire1 unaltered in ER stress inducibility, but hypersensitive to ethanol and high temperature. We conclude that in the ER stress-sensory system BiP is not the principal determinant of Ire1 activity, but an adjustor for sensitivity to various stresses.
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