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A N7-guanine RNA cap methyltransferase signature-sequence as a genetic marker of large genome, non-mammalian Tobaniviridae

Abstract : The order Nidovirales is a diverse group of (+)RNA viruses, classified together based on their common genome organisation and conserved replicative enzymes , despite drastic differences in size and complexity. One such difference pertains to the mechanisms and enzymes responsible for generation of the proposed viral 5 RNA cap. Within the Coronaviri-dae family, two separate methytransferases (MTase), nsp14 and nsp16, perform the RNA-cap N7-guanine and 2-OH methylation respectively for generation of the proposed m7GpppNm type I cap structure. For the majority of other families within the Nidovirales order, the presence, structure and key enzymes involved in 5 capping are far less clear. These viruses either lack completely an RNA MTase signature sequence , or lack an N7-guanine methyltransferase signature sequence, obscuring our understanding about how RNA-caps are N7-methylated for these families. Here, we report the discovery of a puta-tive Rossmann fold RNA methyltransferase in 10 To-baniviridae members in Orf1a, an unusual genome locus for this gene. Multiple sequence alignments and structural analyses lead us to propose this novel gene as a typical RNA-cap N7-guanine MTase with substrate specificity and active-site organization similar to the canonical eukaryotic RNA-cap N7-guanine MTase.
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https://hal.archives-ouvertes.fr/hal-02890583
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Submitted on : Tuesday, July 7, 2020 - 8:55:08 AM
Last modification on : Wednesday, January 19, 2022 - 4:58:42 PM
Long-term archiving on: : Friday, November 27, 2020 - 12:07:42 PM

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Francois Ferron, Humberto Debat, Ashleigh Shannon, Etienne Decroly, Bruno Canard. A N7-guanine RNA cap methyltransferase signature-sequence as a genetic marker of large genome, non-mammalian Tobaniviridae. NAR Genomics and Bioinformatics, Oxford University Press, 2020, 2 (1), ⟨10.1093/nargab/lqz022⟩. ⟨hal-02890583⟩

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