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-Structure paper
タイトル | The human SKI complex regulates channeling of ribosome-bound RNA to the exosome via an intrinsic gatekeeping mechanism. |
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ジャーナル・号・ページ | Mol Cell, Vol. 82, Issue 4, Page 756-769.e8, Year 2022 |
掲載日 | 2022年2月17日 |
著者 | Alexander Kögel / Achim Keidel / Fabien Bonneau / Ingmar B Schäfer / Elena Conti / |
PubMed 要旨 | The superkiller (SKI) complex is the cytoplasmic co-factor and regulator of the RNA-degrading exosome. In human cells, the SKI complex functions mainly in co-translational surveillance-decay ...The superkiller (SKI) complex is the cytoplasmic co-factor and regulator of the RNA-degrading exosome. In human cells, the SKI complex functions mainly in co-translational surveillance-decay pathways, and its malfunction is linked to a severe congenital disorder, the trichohepatoenteric syndrome. To obtain insights into the molecular mechanisms regulating the human SKI (hSKI) complex, we structurally characterized several of its functional states in the context of 80S ribosomes and substrate RNA. In a prehydrolytic ATP form, the hSKI complex exhibits a closed conformation with an inherent gating system that effectively traps the 80S-bound RNA into the hSKI2 helicase subunit. When active, hSKI switches to an open conformation in which the gating is released and the RNA 3' end exits the helicase. The emerging picture is that the gatekeeping mechanism and architectural remodeling of hSKI underpin a regulated RNA channeling system that is mechanistically conserved among the cytoplasmic and nuclear helicase-exosome complexes. |
リンク | Mol Cell / PubMed:35120588 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.1 - 6.5 Å |
構造データ | EMDB-13923, PDB-7qdr: EMDB-13925, PDB-7qds: EMDB-13927, PDB-7qdy: EMDB-13928, PDB-7qdz: EMDB-13929, PDB-7qe0: |
由来 |
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キーワード | RNA BINDING PROTEIN / multiprotein complex / RNA helicase / DExH-box helicase / ATPase / RNA binding |