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-Structure paper
| タイトル | Cryo-EM structures of human ClpXP reveal mechanisms of assembly and proteolytic activation. |
|---|---|
| ジャーナル・号・ページ | Nat Commun, Vol. 17, Issue 1, Page 1064, Year 2026 |
| 掲載日 | 2026年1月27日 |
著者 | Wenqian Chen / Gabriel C Lander / Jie Yang / ![]() |
| PubMed 要旨 | The human ClpXP complex (hClpXP) orchestrates mitochondrial protein quality control through targeted degradation of misfolded and unnecessary proteins. While bacterial ClpXP systems are well ...The human ClpXP complex (hClpXP) orchestrates mitochondrial protein quality control through targeted degradation of misfolded and unnecessary proteins. While bacterial ClpXP systems are well characterized, the assembly and regulation of human ClpXP remain poorly understood. In this study, we elucidate the complete assembly pathway of hClpXP through high-resolution cryo-electron microscopy (cryo-EM) structures. Our findings confirm that hClpP exists as a single-ring heptamer in isolation and reveal a previously undocumented initial assembly complex in which hexameric hClpX first engages with heptameric hClpP. We further demonstrate how this interaction drives substantial conformational rearrangements that facilitate the formation of tetradecameric hClpP within the fully assembled complex. Notably, we characterize a unique eukaryotic sequence in hClpX, termed the E-loop, which plays a critical role in stabilizing hexamer assembly and maintaining ATPase activity. Additionally, we show that peptide binding at the hClpP active site triggers further structural changes essential for achieving full proteolytic competence. Together, these structures provide unprecedented mechanistic insights into the stepwise assembly and activation of hClpXP, significantly advancing our understanding of this essential mitochondrial protein degradation machinery. |
リンク | Nat Commun / PubMed:41593052 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.4 - 4.5 Å |
| 構造データ | EMDB-47232, PDB-9dw0: EMDB-47233, PDB-9dw1: EMDB-47234, PDB-9dw3: EMDB-71425, PDB-9p9v: EMDB-71450, PDB-9pb1: EMDB-71595: Un-crosslinked hClpX map EMDB-71596: Un-crosslinked hClpP map ![]() EMDB-73107: Uncrosslinked hClpXP composite map |
| 化合物 | ![]() ChemComp-BO2: ![]() ChemComp-ADP: ![]() ChemComp-MG: ![]() ChemComp-ATP: |
| 由来 |
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キーワード | STRUCTURAL PROTEIN / Mitochondrial protein / serine protease / HYDROLASE |
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