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Thoms, Matthias; Buschauer, Robert; Ameismeier, Michael; Koepke, Lennart; Denk, Timo; Hirschenberger, Maximilian; Kratzat, Hanna; Hayn, Manuel; Mackens-Kiani, Timur; Cheng, Jingdong; Straub, Jan H; Stürzel, Christina M; Fröhlich, Thomas; Berninghausen, Otto; Becker, Thomas; Kirchhoff, Frank; Sparrer, Konstantin M J; Beckmann, Roland
Science (American Association for the Advancement of Science), 09/2020, Letnik: 369, Številka: 6508Journal Article
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is the causative agent of the current coronavirus disease 2019 (COVID-19) pandemic. A major virulence factor of SARS-CoVs is the nonstructural protein 1 (Nsp1), which suppresses host gene expression by ribosome association. Here, we show that Nsp1 from SARS-CoV-2 binds to the 40 ribosomal subunit, resulting in shutdown of messenger RNA (mRNA) translation both in vitro and in cells. Structural analysis by cryo-electron microscopy of in vitro-reconstituted Nsp1-40 and various native Nsp1-40 and -80 complexes revealed that the Nsp1 C terminus binds to and obstructs the mRNA entry tunnel. Thereby, Nsp1 effectively blocks retinoic acid-inducible gene I-dependent innate immune responses that would otherwise facilitate clearance of the infection. Thus, the structural characterization of the inhibitory mechanism of Nsp1 may aid structure-based drug design against SARS-CoV-2.
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in: SICRIS
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