The endoplasmic reticulum P5A-ATPase is a transmembrane helix dislocase.
The endoplasmic reticulum P5A-ATPase is a transmembrane helix dislocase.
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DOI:
10.1126/science.abc5809
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发表时间:
2020-09-25
期刊:
影响因子:
--
通讯作者:
Park E
中科院分区:
文献类型:
--
作者:
McKenna MJ;Sim SI;Ordureau A;Wei L;Harper JW;Shao S;Park E
Organelle identity depends on protein composition. How mistargeted proteins are selectively recognized and removed from organelles is incompletely understood. Here we found that the orphan P5A-ATPase transporter ATP13A1 (Spf1 in yeast) directly interacted with the transmembrane segment (TM) of mitochondrial tail-anchored proteins. P5A-ATPase activity mediated the extraction of mistargeted proteins from the endoplasmic reticulum (ER). Cryo-EM structures of Saccharomyces cerevisiae Spf1 revealed a large membrane-accessible substrate-binding pocket that alternately faced the ER lumen and cytosol, and an endogenous substrate resembling an α-helical TM. Our results indicate that the P5A-ATPase could dislocate misinserted hydrophobic helices flanked by short basic segments from the ER. TM dislocation by the P5A-ATPase establishes an additional class of P-type ATPase substrates and may correct mistakes in protein targeting or topogenesis. Cryo-EM structures and functional analyses reveal that the orphan P5A-ATPase dislocates misinserted transmembrane helices from the endoplasmic reticulum.
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影响因子:
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DOI:
10.1083/jcb.200203052
发表时间:
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期刊:
The Journal of cell biology
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