Msp1 Clears Mistargeted Proteins by Facilitating Their Transfer from Mitochondria to the ER

Shunsuke Matsumoto, Kunio Nakatsukasa, Chika Kakuta, Yasushi Tamura, Masatoshi Esaki, Toshiya Endo

研究成果: ジャーナルへの寄稿学術誌査読

68 被引用数 (Scopus)

抄録

Normal mitochondrial functions rely on optimized composition of their resident proteins, and proteins mistargeted to mitochondria need to be efficiently removed. Msp1, an AAA-ATPase in the mitochondrial outer membrane (OM), facilitates degradation of tail-anchored (TA) proteins mistargeted to the OM, yet how Msp1 cooperates with other factors to conduct this process was unclear. Here, we show that Msp1 recognizes substrate TA proteins and facilitates their transfer to the endoplasmic reticulum (ER). Doa10 in the ER membrane then ubiquitinates them with Ubc6 and Ubc7. Ubiquitinated substrates are extracted from the ER membrane by another AAA-ATPase in the cytosol, Cdc48, with Ufd1 and Npl4 for proteasomal degradation in the cytosol. Thus, Msp1 functions as an extractase that mediates clearance of mistargeted TA proteins by facilitating their transfer to the ER for protein quality control.

本文言語英語
ページ(範囲)191-205.e10
ジャーナルMolecular Cell
76
1
DOI
出版ステータス出版済み - 10月 3 2019
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 分子生物学
  • 細胞生物学

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