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-Structure paper
| タイトル | A multivalent adaptor mechanism drives the nuclear import of proteasomes. |
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| ジャーナル・号・ページ | Nat Commun, Vol. 17, Issue 1, Year 2026 |
| 掲載日 | 2026年2月4日 |
著者 | Hanna L Brunner / Robert W Kalis / Lorenz Grundmann / Zuzana Hodáková / Zuzana Koskova / Irina Grishkovskaya / Melanie de Almeida / Matthias Hinterndorfer / Hannah Knaudt / Simon Höfflin / Florian Andersch / Harald Kotisch / Achim Dickmanns / Sara Cuylen-Haering / Johannes Zuber / David Haselbach / ![]() |
| PubMed 要旨 | Nuclear protein homeostasis, including transcription factor turnover, critically depends on the nuclear proteasomes that must be imported after cell division. This dynamic process requires AKIRIN2, a ...Nuclear protein homeostasis, including transcription factor turnover, critically depends on the nuclear proteasomes that must be imported after cell division. This dynamic process requires AKIRIN2, a small unstructured protein whose mechanistic role has remained elusive despite its essential function. Using an integrated approach combining protein-wide saturation mutagenesis screens, cryo-EM, and biochemical reconstitution, we characterize AKIRIN2 as a scaffold protein that coordinates the assembly of an importin cluster around the proteasome. AKIRIN2 binds in multiple copies to the 20S proteasome and simultaneously interacts with importin IPO9 and the KPNA2/KPNB1 heterodimer. In the nucleus, RanGTP triggers importin dissociation, releasing the proteasome, while AKIRIN2 undergoes ubiquitin-independent degradation. Our findings reveal how AKIRIN2's multivalency facilitates the recruitment of multiple importins to the proteasome, a critical adaptation for transporting this large macromolecular complex into the nucleus and maintaining the nuclear proteome. |
リンク | Nat Commun / PubMed:41639071 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.2 - 4.2 Å |
| 構造データ | ![]() EMDB-53246: Consensus refinement: Ternary complex of the human 20S proteasome in complex with Importin-9 and two homo dimers of Akirin-2. Focussed refinement EMDB-53248, PDB-9qno: EMDB-53264, PDB-9qon: EMDB-53265: Composite map: Ternary complex of the human 20S proteasome in complex with Importin-9 and two homodimers of Akirin-2 EMDB-53266, PDB-9qop: |
| 由来 |
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キーワード | PROTEIN TRANSPORT / 20S proteasome / 20S / proteasome / nuclear iport / akirin / akirin2 / importin 9 / importin / nuclear import |
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