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-Structure paper
タイトル | Ribosomal stalk-captured CARF-RelE ribonuclease inhibits translation following CRISPR signaling. |
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ジャーナル・号・ページ | Science, Vol. 382, Issue 6674, Page 1036-1041, Year 2023 |
掲載日 | 2023年11月30日 |
著者 | Irmantas Mogila / Giedre Tamulaitiene / Konstanty Keda / Albertas Timinskas / Audrone Ruksenaite / Giedrius Sasnauskas / Česlovas Venclovas / Virginijus Siksnys / Gintautas Tamulaitis |
PubMed 要旨 | Prokaryotic type III CRISPR-Cas antiviral systems employ cyclic oligoadenylate (cA) signaling to activate a diverse range of auxiliary proteins that reinforce the CRISPR-Cas defense. Here we ...Prokaryotic type III CRISPR-Cas antiviral systems employ cyclic oligoadenylate (cA) signaling to activate a diverse range of auxiliary proteins that reinforce the CRISPR-Cas defense. Here we characterize a class of cA-dependent effector proteins named CRISPR-Cas-associated messenger RNA (mRNA) interferase 1 (Cami1) consisting of a CRISPR-associated Rossmann fold sensor domain fused to winged helix-turn-helix and a RelE-family mRNA interferase domain. Upon activation by cyclic tetra-adenylate (cA), Cami1 cleaves mRNA exposed at the ribosomal A-site thereby depleting mRNA and leading to cell growth arrest. The structures of apo-Cami1 and the ribosome-bound Cami1-cA complex delineate the conformational changes that lead to Cami1 activation and the mechanism of Cami1 binding to a bacterial ribosome, revealing unexpected parallels with eukaryotic ribosome-inactivating proteins. |
リンク | Science / PubMed:38033086 |
手法 | EM (単粒子) / X線回折 |
解像度 | 1.7 - 3.67 Å |
構造データ | EMDB-17663: Cami1-ribosome cryoEM-map EMDB-17664: Cami1-ribosome local refinement map with mask on Cami1 and L12-Cter EMDB-17665: Cami1-ribosome local refinement map with mask on 30S subunit EMDB-17666: Cami1-ribosome local refinement map with mask on 50S subunit EMDB-17667, PDB-8phj: PDB-8phb: |
化合物 | ChemComp-HOH: ChemComp-ZN: ChemComp-MG: |
由来 |
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キーワード | HYDROLASE / CRISPR / cyclic oligoadenylate / RNAse / RelE-toxin / RIBOSOME |