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Yuyukina SK, Barmatov AE, Bizyaev SN, Stetsenko DA, Sergeeva OV, Zatsepin TS, Zharkov DO. Activity of nsp14 Exonuclease from SARS-CoV-2 towards RNAs with Modified 3'-Termini. DOKL BIOCHEM BIOPHYS 2023; 509:65-69. [PMID: 37340295 DOI: 10.1134/s1607672923700102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 12/05/2022] [Accepted: 12/09/2022] [Indexed: 06/22/2023]
Abstract
The COVID-19 pandemic has shown the urgent need for new treatments for coronavirus infections. Nucleoside analogs were successfully used to inhibit replication of some viruses through the incorporation into the growing DNA or RNA chain. However, the replicative machinery of coronaviruses contains nsp14, a non-structural protein with a 3'→5'-exonuclease activity that removes misincorporated and modified nucleotides from the 3' end of the growing RNA chain. Here, we studied the efficiency of hydrolysis of RNA containing various modifications in the 3'-terminal region by SARS-CoV-2 nsp14 exonuclease and its complex with the auxiliary protein nsp10. Single-stranded RNA was a preferable substrate compared to double-stranded RNA, which is consistent with the model of transfer of the substrate strand to the exonuclease active site, which was proposed on the basis of structural analysis. Modifications of the phosphodiester bond between the penultimate and last nucleotides had the greatest effect on nsp14 activity.
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Affiliation(s)
- S K Yuyukina
- Novosibirsk State University, Novosibirsk, Russia.
- Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia.
| | - A E Barmatov
- Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
| | - S N Bizyaev
- Novosibirsk State University, Novosibirsk, Russia
- Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
- Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
| | - D A Stetsenko
- Novosibirsk State University, Novosibirsk, Russia
- Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
| | - O V Sergeeva
- Skolkovo Institute of Science and Technology, Moscow, Russia
| | - T S Zatsepin
- Skolkovo Institute of Science and Technology, Moscow, Russia
- Department of Chemistry, Moscow State University, Moscow, Russia
| | - D O Zharkov
- Novosibirsk State University, Novosibirsk, Russia.
- Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia.
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Yuyukina SK, Zharkov DO. Mechanisms of Coronavirus Genome Stability As Potential Targets for Antiviral Drugs. Her Russ Acad Sci 2022; 92:470-478. [PMID: 36091852 PMCID: PMC9447942 DOI: 10.1134/s1019331622040256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 02/25/2022] [Accepted: 03/14/2022] [Indexed: 06/15/2023]
Abstract
The COVID-19 pandemic has made it necessary to create antivirals active against the SARS-CoV-2 coronavirus. One of the widely used strategies to fight off viral infections is the use of modified nucleoside analogues that inhibit viral replication by incorporating DNA or RNA into the growing chain, thus stopping its synthesis. The difficulty of using this method of treatment in the case of SARS-CoV-2 is that coronaviruses have an effective mechanism for maintaining genome stability. Its central element is the nsp14 protein, which is characterized by exonuclease activity, due to which incorrectly included and noncanonical nucleotides are removed from the 3' end of the growing RNA chain. Inhibitors of nsp14 exonuclease and nucleoside analogues resistant to its action are viewed as potential targets for anticoronavirus therapy.
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Affiliation(s)
- S. K. Yuyukina
- Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
- Novosibirsk State University, Novosibirsk, Russia
| | - D. O. Zharkov
- Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
- Novosibirsk State University, Novosibirsk, Russia
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