A dual mechanism of action of AT-527 against SARS-CoV-2 polymerase.
Nat Commun
; 13(1): 621, 2022 02 02.
Article
em En
| MEDLINE
| ID: mdl-35110538
ABSTRACT
The guanosine analog AT-527 represents a promising candidate against Severe Acute Respiratory Syndrome coronavirus type 2 (SARS-CoV-2). AT-527 recently entered phase III clinical trials for the treatment of COVID-19. Once in cells, AT-527 is converted into its triphosphate form, AT-9010, that presumably targets the viral RNA-dependent RNA polymerase (RdRp, nsp12), for incorporation into viral RNA. Here we report a 2.98 Å cryo-EM structure of the SARS-CoV-2 nsp12-nsp7-nsp82-RNA complex, showing AT-9010 bound at three sites of nsp12. In the RdRp active-site, one AT-9010 is incorporated at the 3' end of the RNA product strand. Its modified ribose group (2'-fluoro, 2'-methyl) prevents correct alignment of the incoming NTP, in this case a second AT-9010, causing immediate termination of RNA synthesis. The third AT-9010 is bound to the N-terminal domain of nsp12 - known as the NiRAN. In contrast to native NTPs, AT-9010 is in a flipped orientation in the active-site, with its guanine base unexpectedly occupying a previously unnoticed cavity. AT-9010 outcompetes all native nucleotides for NiRAN binding, inhibiting its nucleotidyltransferase activity. The dual mechanism of action of AT-527 at both RdRp and NiRAN active sites represents a promising research avenue against COVID-19.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Antivirais
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Proteínas Virais
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RNA Polimerase Dependente de RNA
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Guanosina Monofosfato
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Fosforamidas
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SARS-CoV-2
Limite:
Humans
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article