ATP13A1 prevents ERAD of folding-competent mislocalized and misoriented proteins.
ATP13A1 prevents ERAD of folding-competent mislocalized and misoriented proteins.
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DOI:
10.1016/j.molcel.2022.09.035
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发表时间:
2022-11-17
期刊:
影响因子:
16
通讯作者:
Shao, Sichen
中科院分区:
文献类型:
--
作者:
McKenna, Michael J.;Adams, Benjamin M.;Chu, Vincent;Paulo, Joao A.;Shao, Sichen
The biosynthesis of thousands of proteins requires targeting a signal sequence or transmembrane segment (TM) to the endoplasmic reticulum (ER). These hydrophobic α-helices must localize to the appropriate cellular membrane and integrate in the correct topology to maintain a high-fidelity proteome. Here, we show that the P5A-ATPase ATP13A1 prevents the accumulation of mislocalized and misoriented proteins which are eliminated by different ER-associated degradation (ERAD) pathways in mammalian cells. Without ATP13A1, mitochondrial tail-anchored proteins mislocalize to the ER through the ER membrane protein complex and are cleaved by signal peptide peptidase for ERAD. ATP13A1 also facilitates the topogenesis of a subset of proteins with an N-terminal TM or signal sequence that should insert into the ER membrane with a cytosolic N terminus. Without ATP13A1, such proteins accumulate in the wrong orientation and are targeted for ERAD by distinct ubiquitin ligases. Thus, ATP13A1 prevents ERAD of diverse proteins capable of proper folding. McKenna et al. show that corrective quality control by the P5A-ATPase ATP13A1 at the ER prevents wasteful ER-associated degradation of mislocalized and misoriented proteins capable of folding properly.
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