The SARS-CoV-2 Nsp3 macrodomain reverses PARP9/DTX3L-dependent ADP-ribosylation induced by interferon signaling

Russo, Lilian Cristina, Tomasin, Rebeka, Matos, Isaac Araújo, Manucci, Antonio Carlos, Sowa, Sven T, Dale, Katie, Caldecott, Keith W, Lehtiö, Lari, Schechtman, Deborah, Meotti, Flavia C, Bruni-Cardoso, Alexandre and Hoch, Nicolas Carlos (2021) The SARS-CoV-2 Nsp3 macrodomain reverses PARP9/DTX3L-dependent ADP-ribosylation induced by interferon signaling. Journal of Biological Chemistry, 297 (3). a101041 1-14. ISSN 0021-9258

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SARS-CoV-2 nonstructural protein 3 (Nsp3) contains a macrodomain that is essential for coronavirus pathogenesis and is thus an attractive target for drug development. This macrodomain is thought to counteract the host interferon (IFN) response, an important antiviral signalling cascade, via the reversal of protein ADP-ribosylation, a posttranslational modification catalyzed by host poly(ADP-ribose) polymerases (PARPs). However, the main cellular targets of the coronavirus macrodomain that mediate this effect are currently unknown. Here, we use a robust immunofluorescence-based assay to show that activation of the IFN response induces ADP-ribosylation of host proteins and that ectopic expression of the SARSCoV- 2 Nsp3 macrodomain reverses this modification in human cells. We further demonstrate that this assay can be used to screen for on-target and cell-active macrodomain inhibitors. This IFN-induced ADP-ribosylation is dependent on PARP9 and its binding partner DTX3L, but surprisingly the expression of the Nsp3 macrodomain or the deletion of either PARP9 or DTX3L does not impair IFN signaling or the induction of IFNresponsive genes. Our results suggest that PARP9/DTX3Ldependent ADP-ribosylation is a downstream effector of the host IFN response and that the cellular function of the SARSCoV- 2 Nsp3 macrodomain is to hydrolyze this end product of IFN signaling, rather than to suppress the IFN response itself.

Item Type: Article
Keywords: ADP-ribosylation, COVID-19, DTX3L, PARP9, SARS-CoV-2, macrodomain, ADP-Ribosylation, COVID-19, Humans, Interferons, Neoplasm Proteins, Poly(ADP-ribose) Polymerases, SARS-CoV-2, Signal Transduction, Ubiquitin-Protein Ligases
Schools and Departments: School of Life Sciences > Sussex Centre for Genome Damage and Stability
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 18 Jan 2022 13:09
Last Modified: 18 Jan 2022 13:15

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