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Replication of the coronavirus genome: A paradox among positive-strand RNA viruses.
Grellet, Emeline; L'Hôte, India; Goulet, Adeline; Imbert, Isabelle.
  • Grellet E; Aix Marseille Université, Centre National de la Recherche Scientifique, AMU CNRS UMR 7255, LISM, Marseille, France.
  • L'Hôte I; Aix Marseille Université, Centre National de la Recherche Scientifique, AMU CNRS UMR 7255, LISM, Marseille, France.
  • Goulet A; Aix Marseille Université, Centre National de la Recherche Scientifique, AMU CNRS UMR 7255, LISM, Marseille, France.
  • Imbert I; Aix Marseille Université, Centre National de la Recherche Scientifique, AMU CNRS UMR 7255, LISM, Marseille, France. Electronic address: isabelle.imbert@univ-amu.fr.
J Biol Chem ; 298(5): 101923, 2022 05.
Article in English | MEDLINE | ID: covidwho-1778265
ABSTRACT
Coronavirus (CoV) genomes consist of positive-sense single-stranded RNA and are among the largest viral RNAs known to date (∼30 kb). As a result, CoVs deploy sophisticated mechanisms to replicate these extraordinarily large genomes as well as to transcribe subgenomic messenger RNAs. Since 2003, with the emergence of three highly pathogenic CoVs (SARS-CoV, MERS-CoV, and SARS-CoV-2), significant progress has been made in the molecular characterization of the viral proteins and key mechanisms involved in CoV RNA genome replication. For example, to allow for the maintenance and integrity of their large RNA genomes, CoVs have acquired RNA proofreading 3'-5' exoribonuclease activity (in nonstructural protein nsp14). In order to replicate the large genome, the viral-RNA-dependent RNA polymerase (RdRp; in nsp12) is supplemented by a processivity factor (made of the viral complex nsp7/nsp8), making it the fastest known RdRp. Lastly, a viral structural protein, the nucleocapsid (N) protein, which is primarily involved in genome encapsidation, is required for efficient viral replication and transcription. Therefore, CoVs are a paradox among positive-strand RNA viruses in the sense that they use both a processivity factor and have proofreading activity reminiscent of DNA organisms in addition to structural proteins that mediate efficient RNA synthesis, commonly used by negative-strand RNA viruses. In this review, we present a historical perspective of these unsuspected discoveries and detail the current knowledge on the core replicative machinery deployed by CoVs.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: Genome, Viral / Positive-Strand RNA Viruses / SARS-CoV-2 Limits: Humans Language: English Journal: J Biol Chem Year: 2022 Document Type: Article Affiliation country: J.jbc.2022.101923

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Genome, Viral / Positive-Strand RNA Viruses / SARS-CoV-2 Limits: Humans Language: English Journal: J Biol Chem Year: 2022 Document Type: Article Affiliation country: J.jbc.2022.101923