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-Structure paper
| タイトル | Structural remodeling of the mitochondrial protein biogenesis machinery under proteostatic stress. |
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| ジャーナル・号・ページ | Sci Adv, Vol. 12, Issue 10, Page eaed3579, Year 2026 |
| 掲載日 | 2026年3月6日 |
著者 | Kenneth Ehses / Jorge P López-Alonso / Odetta Antico / Yannik Lang / Till Rudack / Abdussalam Azem / Miratul M K Muqit / Iban Ubarretxena-Belandia / Rubén Fernández-Busnadiego / ![]() |
| PubMed 要旨 | Cells have evolved organelle-specific responses to maintain protein homeostasis (proteostasis). During proteostatic stress, mitochondria down-regulate translation and enhance protein folding, yet the ...Cells have evolved organelle-specific responses to maintain protein homeostasis (proteostasis). During proteostatic stress, mitochondria down-regulate translation and enhance protein folding, yet the underlying mechanisms remain poorly defined. Here, we used cryo-electron tomography to observe the structural consequences of mitochondrial proteostatic stress within human cells. We detected protein aggregates within the mitochondrial matrix, accompanied by a marked remodeling of cristae architecture. Concomitantly, the number of mitochondrial ribosome complexes was significantly reduced. Mitochondrial Hsp60 (mHsp60), a key protein folding machine, underwent major conformational changes to favor complexes with its co-chaperone mHsp10. We visualized the interactions of mHsp60 with native substrate proteins and determined in vitro mHsp60 cryo-electron microscopy structures enabling nucleotide state assignment of the in situ structures. These data converge on a model of the mHsp60 functional cycle and its essential role in mitochondrial proteostasis. More broadly, our findings reveal structural mechanisms governing mitochondrial protein biosynthesis and their remodeling under proteostatic stress. |
リンク | Sci Adv / PubMed:41779846 / PubMed Central |
| 手法 | EM (サブトモグラム平均) |
| 解像度 | 7.76 - 22.89 Å |
| 構造データ | ![]() EMDB-55203: Subtomogram average of the 39S mitochondrial ribosome from HeLa ![]() EMDB-55204: Subtomogram average of the 55S mitochondrial ribosome from HeLa ![]() EMDB-55205: Subtomogram average of the mtHsp60 singlering complex from HeLa ![]() EMDB-55206: Subtomogram average of the mtHsp60:mtHsp10 half-football complex from HeLa ![]() EMDB-55207: Subtomogram average of the mtHsp60:mtHsp10 Football complex from HeLa |
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Homo sapiens (ヒト)