Derlin-1 is a rhomboid pseudoprotease required for the dislocation of mutant α-1 antitrypsin from the endoplasmic reticulum.

Derlin-1 is a rhomboid pseudoprotease required for the dislocation of mutant α-1 antitrypsin from the endoplasmic reticulum.
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DOI:
10.1038/nsmb.2111
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发表时间:
2011-09-11
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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错误折叠的分泌蛋白的降解最终由细胞质中的泛素-蛋白酶体系统介导,因此内质网相关降解(ERAD)底物必须通过AAA ATP酶p97/VCP驱动的过程移位穿过ER膜。Derlins招募p97/VCP,并被提议成为脱位机制的一部分。在这里,我们报告说,Derlins是膜内蛋白酶的菱形家族的非活性成员,并通过C-末端SHP盒结合p97/VCP。在菱形结构域内携带突变的人Derlin-1稳定了ER膜胞质面的突变体α-1抗胰蛋白酶(NHK),而不破坏p97/VCP相互作用。我们建议,基板的相互作用和p97/VCP招聘是独立的功能,是必不可少的错位,可以分别分配到菱形域和C端的Derlin-1。这些数据表明,膜内蛋白水解和蛋白质移位共享意想不到的机制功能。
The degradation of misfolded secretory proteins is ultimately mediated by the ubiquitin-proteasome system in the cytoplasm, therefore endoplasmic reticulum–associated degradation (ERAD) substrates must be dislocated across the ER membrane through a process driven by the AAA ATPase p97/VCP. Derlins recruit p97/VCP and have been proposed to be part of the dislocation machinery. Here we report that Derlins are inactive members of the rhomboid family of intramembrane proteases and bind p97/VCP through C-terminal SHP boxes. Human Derlin-1 harboring mutations within the rhomboid domain stabilized mutant α-1 antitrypsin (NHK) at the cytosolic face of the ER membrane without disrupting the p97/VCP interaction. We propose that substrate interaction and p97/VCP recruitment are separate functions that are essential for dislocation and can be assigned respectively to the rhomboid domain and the C terminus of Derlin-1. These data suggest that intramembrane proteolysis and protein dislocation share unexpected mechanistic features.
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