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-Structure paper
| タイトル | Atomic mechanisms of full-length ASC-mediated inflammasome assembly. |
|---|---|
| ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 10564, Year 2025 |
| 掲載日 | 2025年11月26日 |
著者 | Dongmei Xue / Fengyun Ni / Sheng Liu / Huifang Yan / Zhenwei Luo / Gang Fu / Qinghua Wang / Jianpeng Ma / ![]() |
| PubMed 要旨 | ASC (Apoptosis-associated Speck-like protein containing a CARD) is a key adaptor protein that assembles inflammasomes by linking sensors such as NLRP3 to effectors like Caspase-1 via its PYD and CARD ...ASC (Apoptosis-associated Speck-like protein containing a CARD) is a key adaptor protein that assembles inflammasomes by linking sensors such as NLRP3 to effectors like Caspase-1 via its PYD and CARD Death Domains. Due to ASC's propensity to self-aggregate, most high-resolution structural studies focused on isolated PYD or CARD domains, leaving the atomic basis of full-length ASC assembly unknown. Here we determine atomic-resolution cryo-EM structures of PYD and CARD filaments from full-length ASC, revealing characteristic multitrack bundles composed of alternating ASC and ASC filaments that expose multiple interfaces for flexible assembly and efficient signaling. We further show that Caspase-1 filaments nucleate specifically from the B-end of ASC filaments, and that the interdomain linker modulates bundle formation. The ASC isoform ASCb, with a four-residue linker, adopts a distinct architecture, correlating with reduced Caspase-1 activation efficiency. In ASC THP-1 cells, only wild-type ASC, not interface-disrupting mutants, restored ASC speck formation and Caspase-1 activation, underscoring the requirement for intact multitrack bundles. Cryo-electron tomography captures snapshots of higher-order inflammasome structures. These findings collectively define the structural and functional principles by which ASC organizes inflammasomes to amplify immune signaling. |
リンク | Nat Commun / PubMed:41298390 / PubMed Central |
| 手法 | EM (らせん対称) |
| 解像度 | 2.45 - 4.41 Å |
| 構造データ | EMDB-66381, PDB-9wz4: EMDB-66382, PDB-9wz5: EMDB-66383, PDB-9wz6: EMDB-66384, PDB-9wz7: EMDB-66385, PDB-9wz8: EMDB-66387, PDB-9wzb: EMDB-66388, PDB-9wzc: EMDB-66391, PDB-9wzd: EMDB-66401, PDB-9wzg: EMDB-66402, PDB-9wzh: EMDB-66403, PDB-9wzi: |
| 由来 |
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キーワード | IMMUNE SYSTEM / filament / PYD / CARD |
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