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

Abstract

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 SARS-CoV-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 IFN-responsive genes. Our results suggest that PARP9/DTX3L-dependent ADP-ribosylation is a downstream effector of the host IFN response and that the cellular function of the SARS-CoV-2 Nsp3 macrodomain is to hydrolyze this end product of IFN signaling, rather than to suppress the IFN response itself. 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 SARS-CoV-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 IFN-responsive genes. Our results suggest that PARP9/DTX3L-dependent ADP-ribosylation is a downstream effector of the host IFN response and that the cellular function of the SARS-CoV-2 Nsp3 macrodomain is to hydrolyze this end product of IFN signaling, rather than to suppress the IFN response itself. The SARS-CoV-2 pandemic has highlighted the need for an improved understanding of coronavirus pathogenesis for the development of novel antiviral strategies. The interferon (IFN) response is a central component of innate immunity and essentially precludes viral infection, as long as it is properly activated (1Ivashkiv L.B. Donlin L.T. Regulation of type I interferon responses.Nat. Rev. Immunol. 2014; 14: 36-49Crossref PubMed Scopus (1955) Google Scholar, 2Schoggins J.W. Interferon-stimulated genes: What do they all do?.Annu. Rev. Virol. 2019; 6: 567-584Crossref PubMed Scopus (412) Google Scholar). Therefore, successful replication of a virus within host cells requires active suppression or evasion of the host IFN response, which is often mediated by multiple viral proteins acting via separate mechanisms (3Garcia-Sastre A. Ten strategies of interferon evasion by viruses.Cell Host Microbe. 2017; 22: 176-184Abstract Full Text Full Text PDF PubMed Scopus (260) Google Scholar). Type I IFN signaling is initiated upon recognition of viral nucleic acids in the cytoplasm, leading to the production and secretion of type I IFNs, such as IFNα and IFNβ, by virus-infected cells, whereas type II IFN, or IFNγ, is secreted by immune cells (1Ivashkiv L.B. Donlin L.T. Regulation of type I interferon responses.Nat. Rev. Immunol. 2014; 14: 36-49Crossref PubMed Scopus (1955) Google Scholar, 4Lee A.J. Ashkar A.A. The dual nature of type I and type II interferons.Front. Immunol. 2018; 9: 2061Crossref PubMed Scopus (366) Google Scholar). Binding of these cytokines to transmembrane IFN receptors induces activation of JAK kinases such as TYK2, JAK1, and JAK2, leading to phosphorylation and nuclear translocation of transcription factors of the STAT family, mainly STAT1, and subsequent induction of several hundred interferon-stimulated genes (ISGs) (1Ivashkiv L.B. Donlin L.T. Regulation of type I interferon responses.Nat. Rev. Immunol. 2014; 14: 36-49Crossref PubMed Scopus (1955) Google Scholar, 2Schoggins J.W. Interferon-stimulated genes: What do they all do?.Annu. Rev. Virol. 2019; 6: 567-584Crossref PubMed Scopus (412) Google Scholar). Among these ISGs are several members of the poly(ADP-ribose) polymerase (PARP) family, which catalyze the posttranslational modification of proteins with ADP-ribose units using NAD+ as a substrate (5Hoch N.C. Polo L.M. ADP-ribosylation: From molecular mechanisms to human disease.Genet. Mol. Biol. 2019; 43e20190075Crossref PubMed Scopus (29) Google Scholar). ADP-ribosylation has recently emerged as a critical regulator of the IFN response, modulating central steps of this signalling cascade, both upstream of Type I IFN production and downstream of Type I or Type II IFN receptor binding (6Fehr A.R. Singh S.A. Kerr C.M. Mukai S. Higashi H. Aikawa M. The impact of PARPs and ADP-ribosylation on inflammation and host-pathogen interactions.Genes Dev. 2020; 34: 341-359Crossref PubMed Scopus (109) Google Scholar, 7Hoch N.C. Host ADP-ribosylation and the SARS-CoV-2 macrodomain.Biochem. Soc. Trans. 2021; https://doi.org/10.1042/BST20201212Crossref PubMed Scopus (8) Google Scholar). Several IFN-regulated PARPs are also antiviral effectors, either by modifying host proteins involved in protein translation, stress granule formation and intracellular protein trafficking, or via modification and inhibition of viral proteins directly (6Fehr A.R. Singh S.A. Kerr C.M. Mukai S. Higashi H. Aikawa M. The impact of PARPs and ADP-ribosylation on inflammation and host-pathogen interactions.Genes Dev. 2020; 34: 341-359Crossref PubMed Scopus (109) Google Scholar). Interestingly, some of these IFN-responsive PARPs, including PARP9, are rapidly evolving in the primate lineage, suggesting that they are engaged in an “arms race” with viral pathogens (8Daugherty M.D. Young J.M. Kerns J.A. Malik H.S. Rapid evolution of PARP genes suggests a broad role for ADP-ribosylation in host-virus conflicts.PLoS Genet. 2014; 10e1004403Crossref PubMed Scopus (117) Google Scholar). To counteract antiviral ADP-ribosylation by host PARPs, SARS-CoV-2 and other coronaviruses encode a macrodomain within nonstructural protein 3 (Nsp3) that hydrolyzes ADP-ribose modifications (7Hoch N.C. Host ADP-ribosylation and the SARS-CoV-2 macrodomain.Biochem. Soc. Trans. 2021; https://doi.org/10.1042/BST20201212Crossref PubMed Scopus (8) Google Scholar, 9Alhammad Y.M.O. Fehr A.R. The viral macrodomain counters host antiviral ADP-ribosylation.Viruses. 2020; 12: 384Crossref Scopus (63) Google Scholar, 10Alhammad Y.M.O. Kashipathy M.M. Roy A. Gagne J.P. McDonald P. Gao P. Nonfoux L. Battaile K.P. Johnson D.K. Holmstrom E.D. Poirier G.G. Lovell S. Fehr A.R. The SARS-CoV-2 conserved macrodomain is a mono-ADP-ribosylhydrolase.J. Virol. 2021; 95e01969-20Crossref PubMed Scopus (55) Google Scholar, 11Leung A.K.L. McPherson R.L. Griffin D.E. Macrodomain ADP-ribosylhydrolase and the pathogenesis of infectious diseases.PLoS Pathog. 2018; 14e1006864Crossref PubMed Scopus (35) Google Scholar). Importantly, inactivating the mutations within this domain leads to reduced viral replication and increased activation of the host IFN response (12Fehr A.R. Athmer J. Channappanavar R. Phillips J.M. Meyerholz D.K. Perlman S. The Nsp3 macrodomain promotes virulence in mice with coronavirus-induced encephalitis.J. Virol. 2015; 89: 1523-1536Crossref PubMed Scopus (112) Google Scholar, 13Fehr A.R. Channappanavar R. Jankevicius G. Fett C. Zhao J. Athmer J. Meyerholz D.K. Ahel I. Perlman S. The conserved coronavirus macrodomain promotes virulence and suppresses the innate immune response during severe acute respiratory syndrome coronavirus infection.mBio. 2016; 7e01721-16Crossref PubMed Scopus (151) Google Scholar, 14Grunewald M.E. Chen Y. Kuny C. Maejima T. Lease R. Ferraris D. Aikawa M. Sullivan C.S. Perlman S. Fehr A.R. The coronavirus macrodomain is required to prevent PARP-mediated inhibition of virus replication and enhancement of IFN expression.PLoS Pathog. 2019; 15e1007756Crossref PubMed Scopus (105) Google Scholar), strongly indicating that pharmacological inhibition of the Nsp3 macrodomain may be of substantial therapeutic value (9Alhammad Y.M.O. Fehr A.R. The viral macrodomain counters host antiviral ADP-ribosylation.Viruses. 2020; 12: 384Crossref Scopus (63) Google Scholar, 15Brosey C.A. Houl J.H. Katsonis P. Balapiti-Modarage L.P.F. Bommagani S. Arvai A. Moiani D. Bacolla A. Link T. Warden L.S. Lichtarge O. Jones D.E. Ahmed Z. Tainer J.A. Targeting SARS-CoV-2 Nsp3 macrodomain structure with insights human poly(ADP-ribose) with Mol. Biol. 2021; PubMed Scopus (29) Google Scholar, Z. M. Ahel D. Ahel I. and of the pharmacological Biol. 2020; PubMed Scopus Google Scholar, M. S. D. T. Young L. I. binding to the Nsp3 macrodomain of SARS-CoV-2 and 2021; PubMed Scopus Google Scholar). Here, we show that activation of Type I or Type II IFN signaling induces ADP-ribosylation of host proteins that can be by ectopic expression of the SARS-CoV-2 Nsp3 macrodomain in human cells. This ADP-ribosylation is dependent on the IFN-responsive but does not to IFN signaling Nsp3 macrodomain expression or effect on phosphorylation or the induction of We that PARP9/DTX3L-dependent ADP-ribosylation of host which can be by the SARS-CoV-2 Nsp3 is a downstream effector of the IFN To the of the SARS-CoV-2 Nsp3 we a assay to IFN-induced ADP-ribosylation in human cells. We human cells with the which induces a type I IFN A.A. of interferon and host S. A. PubMed Scopus Google Scholar, M. T. induction by including Rev. PubMed Scopus Google Scholar), or these cells with IFNγ, which induces type II IFN signalling S. S. antiviral mechanisms of 2018; PubMed Scopus Google Scholar, in human by Scopus Google Scholar). both to robust phosphorylation of on which to the the binding for and a for robust and and we a in a ADP-ribose in response to either or Therefore, both type I and type II IFN signaling ADP-ribosylation in human cells. we SARS-CoV-2 Nsp3 macrodomain using and that of the cells the macrodomain using macrodomain expression reduced both or ADP-ribosylation with To these we cells a macrodomain Y.M.O. Kashipathy M.M. Roy A. Gagne J.P. McDonald P. Gao P. Nonfoux L. Battaile K.P. Johnson D.K. Holmstrom E.D. Poirier G.G. Lovell S. Fehr A.R. The SARS-CoV-2 conserved macrodomain is a mono-ADP-ribosylhydrolase.J. Virol. 2021; 95e01969-20Crossref PubMed Scopus (55) Google Scholar, 13Fehr A.R. Channappanavar R. Jankevicius G. Fett C. Zhao J. Athmer J. Meyerholz D.K. Ahel I. Perlman S. The conserved coronavirus macrodomain promotes virulence and suppresses the innate immune response during severe acute respiratory syndrome coronavirus infection.mBio. 2016; 7e01721-16Crossref PubMed Scopus (151) Google and the with the of IFNα and expression of the macrodomain reduced ADP-ribosylation by all of the expression of the effect on IFN-induced ADP-ribosylation indicating that required for this these we that the than the macrodomain which in for the of ADP-ribose in the of cells the Therefore, the in a of cells that of and on which not the and and To further these we with expression of either or macrodomain ADP-ribosylation and either of the cells with the results expression of the macrodomain reduced ADP-ribosylation, which by the the cells used in this to expression and with effect on the and these that the Nsp3 in human cells, hydrolyzes the ADP-ribosylation of host proteins by both type I or type II IFN the need for antiviral for and the that the macrodomain is an attractive therapeutic target (9Alhammad Y.M.O. Fehr A.R. The viral macrodomain counters host antiviral ADP-ribosylation.Viruses. 2020; 12: 384Crossref Scopus (63) Google Scholar, 15Brosey C.A. Houl J.H. Katsonis P. Balapiti-Modarage L.P.F. Bommagani S. Arvai A. Moiani D. Bacolla A. Link T. Warden L.S. Lichtarge O. Jones D.E. Ahmed Z. Tainer J.A. Targeting SARS-CoV-2 Nsp3 macrodomain structure with insights human poly(ADP-ribose) with Mol. Biol. 2021; PubMed Scopus (29) Google Scholar, Z. M. Ahel D. Ahel I. and of the pharmacological Biol. 2020; PubMed Scopus Google Scholar, M. S. D. T. Young L. I. binding to the Nsp3 macrodomain of SARS-CoV-2 and 2021; PubMed Scopus Google Scholar), we to that as Nsp3 macrodomain inhibitors. we a screen of a of that for human use by in the the of the SARS-CoV-2 Nsp3 macrodomain to ADP-ribose and the of of and in and cellular which of a protein upon we in to the substantial in of the Nsp3 macrodomain by the ADP-ribose of the of binding to the macrodomain results in cellular in which of the IFN-induced ADP-ribosylation in cells and the effect of in the cellular screen not in Interestingly, we that some reduced IFN-induced ADP-ribosylation and of these an of the JAK kinases that in response to IFN receptor activation S. J.W. M. M. of innate and immune by Immunol. PubMed Scopus Google Scholar). phosphorylation in response to and and this in a of IFN-induced ADP-ribosylation and This suggests that ADP-ribosylation is to be catalyzed by an IFN-responsive PARP that is by This by the that an of activated PARPs and that also and the used C. R. L. A. J. S. S. H. C. A. novel of poly(ADP-ribose) PubMed Scopus Google Scholar, L. R. H. Jones L. C. A. M. S. J. D. PARP insights the role of inhibition for both and with in 2016; PubMed Scopus Google Scholar, T. T. M. L. M. H. for and in poly(ADP-ribose) polymerase (PARP) and 2017; PubMed Scopus Google effect on IFN-induced ADP-ribosylation or on phosphorylation and and such IFN-responsive PARP is PARP9, which a with DTX3L and has to in antiviral P. C. J. and are by a and are in with a Biol. PubMed Scopus Google Scholar, Y. D. Z. G. R. J. S. targets host and viral to interferon signaling and viral Immunol. 2015; PubMed Scopus Google Scholar). We PARP9 and DTX3L cells in an and and and to IFN-induced ADP-ribosylation in these cells. with cells, ADP-ribosylation in cells, that this response is not to cells PARP9 and DTX3L cells reduced ADP-ribosylation with and To this by an effect of PARP9 or DTX3L on IFN signaling we phosphorylation in response to in these cells, which that PARP9 or DTX3L effect on phosphorylation To the reduced ADP-ribosylation in PARP9 or DTX3L cells may be by a in IFN signaling downstream of we to the induction of genes and T. Y. T. J. of the transcription and by cytokines and of S. A. PubMed Scopus Google Scholar, O. H. I. J. to virus in PubMed Scopus Google Scholar, D. D. transcription of a a protein on an upstream S. A. PubMed Scopus Google Scholar, L. M. induction of for PubMed Scopus Google with either or induction of these ISGs in cells or but of PARP9 or DTX3L not the induction of of these genes of the that PARP9 and DTX3L are essential for IFN-induced ADP-ribosylation of host which downstream of of these we to Nsp3 macrodomain expression host IFN signaling or its role is also downstream of with the cells of phosphorylation by in response to either or of the Nsp3 macrodomain also effect on the induction of ISGs in response to either or with macrodomain expression not impair phosphorylation or the induction of the IFN-responsive PARP9 or DTX3L proteins with IFNβ, IFNγ, or and and To the of IFN-induced signaling, protein and ADP-ribosylation, we a of in response to IFNγ, IFNβ, or and and phosphorylation in response to and whereas robust phosphorylation to the production of type I IFN by the cells and and with macrodomain expression not the or the of phosphorylation of the and and the of DTX3L protein induction with the formation of ADP-ribosylation, both of which to IFN than the of phosphorylation and and these that the Nsp3 macrodomain does not the host IFN signaling or the induction of interferon-stimulated but is involved in downstream by IFN-induced ADP-ribosylation viral evasion or suppression of the host interferon response is for the of a viral and is often mediated by several viral factors acting on multiple host targets (3Garcia-Sastre A. Ten strategies of interferon evasion by viruses.Cell Host Microbe. 2017; 22: 176-184Abstract Full Text Full Text PDF PubMed Scopus (260) Google Scholar). The coronavirus Nsp3 macrodomain is thought to an important of coronavirus pathogenesis by host antiviral ADP-ribosylation and is thus an attractive drug target (7Hoch N.C. Host ADP-ribosylation and the SARS-CoV-2 macrodomain.Biochem. Soc. Trans. 2021; https://doi.org/10.1042/BST20201212Crossref PubMed Scopus (8) Google Scholar, 9Alhammad Y.M.O. Fehr A.R. The viral macrodomain counters host antiviral ADP-ribosylation.Viruses. 2020; 12: 384Crossref Scopus (63) Google Scholar, 15Brosey C.A. Houl J.H. Katsonis P. Balapiti-Modarage L.P.F. Bommagani S. Arvai A. Moiani D. Bacolla A. Link T. Warden L.S. Lichtarge O. Jones D.E. Ahmed Z. Tainer J.A. Targeting SARS-CoV-2 Nsp3 macrodomain structure with insights human poly(ADP-ribose) with Mol. Biol. 2021; PubMed Scopus (29) Google Scholar, Z. M. Ahel D. Ahel I. and of the pharmacological Biol. 2020; PubMed Scopus Google Scholar, M. S. D. T. Young L. I. binding to the Nsp3 macrodomain of SARS-CoV-2 and 2021; PubMed Scopus Google Scholar). However, is the molecular targets of IFN-responsive PARPs and reversal of these modifications by the Nsp3 macrodomain may its We a cellular immunofluorescence-based assay that can the of ADP-ribosylation by both type I and type II IFN signaling in response to the viral or interferon and which is with that results in ADP-ribosylation during the of activation H. Maejima T. Y. Singh S.A. Aikawa M. the of human cells and 2019; PubMed Scopus Google Scholar). We that SARS-CoV-2 Nsp3 macrodomain can hydrolyze these modifications in human cells to in using coronavirus Nsp3 Y.M.O. Kashipathy M.M. Roy A. Gagne J.P. McDonald P. Gao P. Nonfoux L. Battaile K.P. Johnson D.K. Holmstrom E.D. Poirier G.G. Lovell S. Fehr A.R. The SARS-CoV-2 conserved macrodomain is a mono-ADP-ribosylhydrolase.J. Virol. 2021; 95e01969-20Crossref PubMed Scopus (55) Google Scholar, 13Fehr A.R. Channappanavar R. Jankevicius G. Fett C. Zhao J. Athmer J. Meyerholz D.K. Ahel I. Perlman S. The conserved coronavirus macrodomain promotes virulence and suppresses the innate immune response during severe acute respiratory syndrome coronavirus infection.mBio. 2016; 7e01721-16Crossref PubMed Scopus (151) Google Scholar). We this assay in a screen for Nsp3 macrodomain which but highlighted the of which to for in than a the of required to on the SARS-CoV-2 virus and the in these on-target in of successful in viral A. T. Z. A. H. J. R. drug for 2021; PubMed Scopus Google Scholar), we that a cellular assay such as the may be a critical in the development of Nsp3 macrodomain a in this assay that are and on-target in human cells. This assay also to the and of the IFN-induced Interestingly, we that Nsp3 macrodomain expression with a but not in ADP-ribosylation in cells this effect also upon this ADP-ribosylation may IFN signaling in cells. the we is and has a we in this with and and it be critical to not this structure but also the protein targets of the Nsp3 ADP-ribosylation by the IFN response, in to the antiviral function of this that inhibition of PARPs with effect on IFN-induced ADP-ribosylation, but inhibition of JAK kinases its formation and that the ADP-ribosylation is catalyzed by a PARP expression is by IFN Importantly, we that the expression is is for this ADP-ribosylation, as the upon of either of these genes PARP9 or DTX3L is required for this is to as of either the of the binding partner in with of these proteins P. C. J. and are by a and are in with a Biol. PubMed Scopus Google Scholar, Y. D. Z. G. R. J. S. targets host and viral to interferon signaling and viral Immunol. 2015; PubMed Scopus Google Scholar). Interestingly, PARP9 and DTX3L expression is also in cells with as long as viral is to an IFN response D. S. D. R. M. D. host response to SARS-CoV-2 development of 2020; Full Text Full Text PDF PubMed Scopus Google Scholar). with induction these is by with a JAK D. S. D. R. M. D. host response to SARS-CoV-2 development of 2020; Full Text Full Text PDF PubMed Scopus Google Scholar). it is to that directly catalyze the formation of the IFN-induced ADP-ribose we we a role of these proteins in a signaling that in ADP-ribosylation by We that the promotes this ADP-ribosylation as a downstream effector of the IFN response, as we not an effect of deletion on phosphorylation or induction are that PARP9 and DTX3L induction in response to IFN signaling in human cells Y. D. Z. G. R. J. S. targets host and viral to interferon signaling and viral Immunol. 2015; PubMed Scopus Google and that PARP9 phosphorylation and induction in H. C. A. P. A. I. H. T. M. D. A. and activation via 2016; PubMed Scopus (151) Google Scholar). further are required to the role of PARP9 and DTX3L in the IFN response, we that in of or or or for these with for an effector function of this PARP9/DTX3L-dependent ADP-ribosylation, the ectopic expression of the Nsp3 macrodomain also effect on phosphorylation or induction ADP-ribosylation This macrodomain in a coronavirus to an in IFN production by virus-infected M.E. Chen Y. Kuny C. Maejima T. Lease R. Ferraris D. Aikawa M. Sullivan C.S. Perlman S. Fehr A.R. The coronavirus macrodomain is required to prevent PARP-mediated inhibition of virus replication and enhancement of IFN expression.PLoS Pathog. 2019; 15e1007756Crossref PubMed Scopus (105) Google Scholar). this the macrodomain to mainly counteract M.E. Chen Y. Kuny C. Maejima T. Lease R. Ferraris D. Aikawa M. Sullivan C.S. Perlman S. Fehr A.R. The coronavirus macrodomain is required to prevent PARP-mediated inhibition of virus replication and enhancement of IFN expression.PLoS Pathog. 2019; 15e1007756Crossref PubMed Scopus (105) Google Scholar), which is thought to upstream of the production of type I IFN by virus-infected cells G. G. A. A. M. M. T. G. the nuclear of a of type I Immunol. 2018; PubMed Scopus Google Scholar). results are not as may not the of IFN-induced ADP-ribosylation or the macrodomain may hydrolyze PARP targets that a role in the IFN response to J. D. J. in innate immune response and Rev. Immunol. 2014; 34: Google Scholar). macrodomain in the of a Nsp3 protein may on the of other such as the to suppress IFN signaling D. R. D. D. A. L. M. A.R. G. A. H. S. SARS-CoV-2 viral and innate 2020; PubMed Scopus Google Scholar, M. G. Y. Z. Z. Y. S. G. of the multiple coronavirus nonstructural protein 2021; PubMed Scopus Google Scholar). we show that the SARS-CoV-2 Nsp3 macrodomain hydrolyzes PARP9/DTX3L-dependent ADP-ribosylation by IFN signaling and a role for this modification as a rather than of the IFN response of this we a cellular assay with the to impact drug currently to target the Nsp3 macrodomain as a novel cells in and cells in both with cells in with acids and in a and and directly to the the and using and the cells or the the as the induction of IFN macrodomain a by of and via and a to an This a via and or and via and the The by and all by of the with and cells using the and and used to cells in the of to the for of cells for The structure of the Nsp3 macrodomain SARS-CoV-2 with ADP-ribose used for Y. R. L. M. A. of SARS-CoV-2 ADP-ribose From the to 2020; PubMed Scopus Google Scholar). The of and the of the and and with and The protein as and the as the using the of to the of function and the to other the with with and The of of and in the of molecular and the molecular by ADP-ribose and in and by A. molecular Mol. 14: Scopus Google Scholar). the of in the in as target The SARS-CoV-2 Nsp3 macrodomain using H.S. H.S. J.H. and as a and for PubMed Scopus Google Scholar). the and of in a with SARS-CoV-2 Nsp3 macrodomain and with polymerase for and for on The used to cells to on using the J. A. for and deletion of using the PubMed Scopus Google Scholar). The by of the and used to cells. including with and with of and an of an the cells by for The in and protein the cells and by The and a with and with The with of and of The protein using by and to the by a to on a in and and The SARS-CoV-2 Nsp3 macrodomain to in assay and with of the The to in the or of ADP-ribose used as and a of to and in to with the by The of and on the of protein in PARP9 and DTX3L and and We that these which as with of a Y. D. using 2014; PubMed Scopus Google are with the Gao L. with improved 2016; PubMed Scopus Google Scholar). Therefore, cells with either of these and the using a and cells with for by and with of PARP9 and DTX3L protein the and by cells in and directly in of and to for and the protein using protein of protein and of and for and to of protein in to with and the such that of the be with the with for and with in in and of with and the using a using either on or in as with and with or in which with in or in in in and with for or in with with and the in or the in on a on a using or and an of using and using in the and the of for of cells ADP-ribose in the and the by the nuclear for a other or the of ADP-ribose within this cellular the as and the in all for of cells both the of all cells within a and this value to the of the for cells using an with and using to using both and This used for using with using of the in which A. 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