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-Structure paper
| タイトル | The mechanism of pathogenic α-antitrypsin aggregation in the human liver. |
|---|---|
| ジャーナル・号・ページ | Proc Natl Acad Sci U S A, Vol. 122, Issue 46, Page e2507535122, Year 2025 |
| 掲載日 | 2025年11月18日 |
著者 | Ibrahim Aldobiyan / Emma L K Elliston / Narinder Heyer-Chauhan / Stefan T Arold / Lingyun Zhao / Brandon Huntington / Sarah M Lowen / Elena V Orlova / James A Irving / David A Lomas / ![]() |
| PubMed 要旨 | Originating 2 to 3 millennia ago in a Scandinavian population, the SERPINA1 Z allele (Glu342Lys) is present in up to 2.5% of populations of Northern European descent and accounts for 95% of severe α- ...Originating 2 to 3 millennia ago in a Scandinavian population, the SERPINA1 Z allele (Glu342Lys) is present in up to 2.5% of populations of Northern European descent and accounts for 95% of severe α-antitrypsin deficiency. The α-antitrypsin Z variant self-assembles into polymer chains that deposit within hepatocytes, predisposing to liver disease. Here, the 4.0Å subunit structure of polymers isolated directly from human liver tissue has been determined using cryoelectron microscopy. Challenges of flexibility, small subunit size, heterogeneous length, and preferred orientations were mitigated using antibody Fab domains and sample preparation strategies. This structure demonstrates that the formation of polymers in vivo involves self-incorporation of an exposed structural element (the reactive center loop) as an additional β-strand into the central β-sheet of α-antitrypsin and displacement of a C-terminal region from one subunit with incorporation into the next. Unlike amyloid aggregation, this well-folded structure partially recapitulates a conformation adopted during normal function of the protein. These perturbations to the constituent α-antitrypsin subunits of human tissue-derived polymers are consistent with a pronounced stability, their tendency toward long-chain forms, the ability of a subset to undergo canonical secretion, and the action of a class of small molecules that block polymerization in vivo. |
リンク | Proc Natl Acad Sci U S A / PubMed:41231946 / PubMed Central |
| 手法 | EM (単粒子) / X線回折 |
| 解像度 | 2.2 - 3.98 Å |
| 構造データ | ![]() EMDB-52659: A subunit of alpha-1 antitrypsin polymers isolated from ZZ explant liver tissue and decorated with conformationally nonselective Fab 9C5 ![]() PDB-9gjv: ![]() PDB-9hud: |
| 化合物 | ![]() ChemComp-HOH: ![]() ChemComp-EDO: ![]() ChemComp-GLY: ![]() ChemComp-CL: ![]() ChemComp-NA: ![]() ChemComp-GOL: ![]() ChemComp-LYS: |
| 由来 |
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キーワード | PROTEIN BINDING / Fab fragment / antitrypsin / serpin / antibody / Complex / Cleaved Alpha-1-antitrypsin / Alpha-1-antitrypsin / Fab / Fragment antigen-binding region / Antibody antigen complex / 9C5 |
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homo sapiens (ヒト)
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