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:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Park E
Park E
中科院分区:
其他
文献类型:
--
作者:
McKenna MJ;Sim SI;Ordureau A;Wei L;Harper JW;Shao S;Park E

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细胞器的身份取决于蛋白质的组成。错误的蛋白质是如何被选择性地识别并从细胞器中移除的还不完全清楚。在这里,我们发现孤儿P5 A-ATP酶转运蛋白ATP 13 A1(Spf 1在酵母中)直接与线粒体尾锚定蛋白的跨膜片段(TM)相互作用。P5 A-ATP酶活性介导从内质网(ER)提取错误的蛋白质。Cryo-EM结构的酿酒酵母Spf 1揭示了一个大的膜可达的底物结合口袋,交替面对ER腔和胞质溶胶,和内源性底物类似的α-螺旋TM。我们的研究结果表明,P5 A-ATP酶可以从ER中错位插入的疏水螺旋,两侧是短的基本片段。由P5 A-ATP酶引起的TM移位建立了另一类P型ATP酶底物,并可能纠正蛋白质靶向或局部生成中的错误。Cryo-EM结构和功能分析表明,孤儿P5 A-ATP酶从内质网错位插入跨膜螺旋。
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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