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-Structure paper
| タイトル | Structural Analysis of Human LonP1 Protease Bound with the Native Substrate. |
|---|---|
| ジャーナル・号・ページ | Life (Basel), Vol. 16, Issue 3, Year 2026 |
| 掲載日 | 2026年3月16日 |
著者 | Ming Li / Hongwei Liu / Shengchun Zhang / Qijun Gao / Shanshan Li / Junfeng Wang / Kaiming Zhang / ![]() |
| PubMed 要旨 | The human mitochondrial Lon protease (LonP1) is a central regulator of mitochondrial DNA copy number and metabolic reprogramming. However, the structural basis for how LonP1 recognizes native ...The human mitochondrial Lon protease (LonP1) is a central regulator of mitochondrial DNA copy number and metabolic reprogramming. However, the structural basis for how LonP1 recognizes native physiological substrates remains elusive. Here, we present the high-resolution cryo-EM structure of the human LonP1 hexamer actively engaging its native substrate, TFAM. The reconstruction reveals a distinct bipartite search-and-shred mechanism. Unlike its bacterial homologs, the human N-terminal domain (NTD) adopts a compact architecture acting as a selective vestibule to recruit and initially unfold the substrate tertiary structure. Subsequently, the polypeptide is threaded through the central channel via a hand-over-hand mechanism driven by a spiral array of aromatic pore-loops. This structural framework provides a mechanistic rationale for the spatial segregation of LonP1 and offers a template for targeting mitochondrial proteostasis in human diseases. |
リンク | Life (Basel) / PubMed:41900996 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.22 Å |
| 構造データ | EMDB-68281, PDB-22ib: |
| 化合物 | ![]() ChemComp-AGS: ![]() ChemComp-ADP: ![]() ChemComp-MG: |
| 由来 |
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キーワード | STRUCTURAL PROTEIN / Human Lon protease / Complex |
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