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-Structure paper
| タイトル | Structural Basis and Rational Design of Nucleotide Analogue Inhibitor Evading the SARS-CoV-2 Proofreading Enzyme. |
|---|---|
| ジャーナル・号・ページ | J Am Chem Soc, Vol. 147, Issue 25, Page 21896-21906, Year 2025 |
| 掲載日 | 2025年6月25日 |
著者 | Junbo Wang / Yufan Pan / Yixiao Liu / Bo Huang / Ge Jin / Lejin Zhang / Feng Zhou / Xiaoyu Chang / Yucen Huang / Liming Yan / Yuanchen Dong / Zihe Rao / Dongsheng Liu / Zhiyong Lou / ![]() |
| PubMed 要旨 | All coronaviruses (CoVs) encode an exoribonuclease in nonstructural protein nsp14 (nsp14 ExoN), which is required for the excision of mismatched nucleotides or nucleotide analogues (NAs) that are ...All coronaviruses (CoVs) encode an exoribonuclease in nonstructural protein nsp14 (nsp14 ExoN), which is required for the excision of mismatched nucleotides or nucleotide analogues (NAs) that are incorporated into nascent RNA. Here, we investigated the mechanism by which NAs evade SARS-CoV-2 nsp14 ExoN cleavage using chemically synthesized RNA with NAs incorporated at the 3' end. Nsp14 ExoN exhibited significantly attenuated activity on RNA with sofosbuvir monophosphate (SMP) compared with natural nucleotides, remdesivir/molnupiravir monophosphate, and, in particular, AT-9010 monophosphate (ATMP), which has the same chemically modified ribose moiety as SMP, incorporated at the 3' end. Cryo-electron microscopy structures of nsp10/14 bound to RNA-SMP/-ATMP and mutagenesis studies revealed the essential roles of H95/Q145/F146 in recognizing the base moiety and thus pulling the NAs into a favored conformation for cleavage. Therefore, NAs may evade nsp14 ExoN cleavage by having (1) a base that does not interact with H95, Q145, or F146 and (2) a chemically modified ribose. Guided by this hypothesis, two NAs were designed to effectively resist nsp14 ExoN cleavage. These results inform the rational design of anti-CoV NAs. |
リンク | J Am Chem Soc / PubMed:40509573 |
| 手法 | EM (単粒子) |
| 解像度 | 2.99 - 4.22 Å |
| 構造データ | EMDB-64956, PDB-9vck: EMDB-64957, PDB-9vcl: ![]() EMDB-64958: Cryo-EM structure of SARS-CoV-2 nsp10/nsp14:RNA:SMP complex (focused on ExoN) ![]() EMDB-64959: Cryo-EM structure of SARS-CoV-2 nsp10/14:RNA-ATMP complex (focused on ExoN) |
| 化合物 | ![]() ChemComp-ZN: ![]() ChemComp-CA: ![]()
ChemComp-K5X: ![]()
ChemComp-EIF: ![]() ChemComp-HOH: |
| 由来 |
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キーワード | VIRAL PROTEIN/RNA / SARS-CoV-2 / exonuclease / nsp14 / nucleotide analogue / VIRAL PROTEIN-RNA complex |
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