scholarly journals Characterization of Novel Splice Variants of Zinc Finger Antiviral Protein (ZAP)

2019 ◽  
Vol 93 (18) ◽  
Author(s):  
Melody M. H. Li ◽  
Eduardo G. Aguilar ◽  
Eleftherios Michailidis ◽  
Jonathan Pabon ◽  
Paul Park ◽  
...  
Keyword(s):  
Zinc Finger ◽  
Ebola Virus ◽  
Splice Variants ◽  
Gene Knockout ◽  
Type I ◽  
Cellular Functions ◽  
Antiviral Protein ◽  
Full Spectrum ◽  
Dna Viruses ◽  
Wide Range

ABSTRACTGiven the unprecedented scale of the recent Ebola and Zika viral epidemics, it is crucial to understand the biology of host factors with broad antiviral action in order to develop novel therapeutic approaches. Here, we look into one such factor: zinc finger antiviral protein (ZAP) inhibits a variety of RNA and DNA viruses. Alternative splicing results in two isoforms that differ at their C termini: ZAPL (long) encodes a poly(ADP-ribose) polymerase (PARP)-like domain that is missing in ZAPS (short). Previously, it has been shown that ZAPL is more antiviral than ZAPS, while the latter is more induced by interferon (IFN). In this study, we discovered and confirmed the expression of two additional splice variants of human ZAP: ZAPXL (extralong) and ZAPM (medium). We also found two haplotypes of human ZAP. Since ZAPL and ZAPS have differential activities, we hypothesize that all four ZAP isoforms have evolved to mediate distinct antiviral and/or cellular functions. By taking a gene-knockout-and-reconstitution approach, we have characterized the antiviral, translational inhibition, and IFN activation activities of individual ZAP isoforms. Our work demonstrates that ZAPL and ZAPXL are more active against alphaviruses and hepatitis B virus (HBV) than ZAPS and ZAPM and elucidates the effects of splice variants on the action of a broad-spectrum antiviral factor.IMPORTANCEZAP is an IFN-induced host factor that can inhibit a wide range of viruses, and there is great interest in fully characterizing its antiviral mechanism. This is the first study that defines the antiviral capacities of individual ZAP isoforms in the absence of endogenous ZAP expression and, hence, cross talk with other isoforms. Our data demonstrate that ZAP is expressed as four different forms: ZAPS, ZAPM, ZAPL, and ZAPXL. The longer ZAP isoforms better inhibit alphaviruses and HBV, while all isoforms equally inhibit Ebola virus transcription and replication. In addition, there is no difference in the abilities of ZAP isoforms to enhance the induction of type I IFN expression. Our results show that the full spectrum of ZAP activities can change depending on the virus target and the relative levels of basal expression and induction by IFN or infection.

scholarly journals Cellular Zinc Finger Protein 622 Hinders Human Adenovirus Lytic Growth and Limits Binding of the Viral pVII Protein to Virus DNA

2018 ◽  
Vol 93 (3) ◽  
Author(s):  
Kwangchol Mun ◽  
Tanel Punga
Keyword(s):  
Life Cycle ◽  
Zinc Finger ◽  
Zinc Finger Protein ◽  
Human Adenovirus ◽  
Antiviral Protein ◽  
Viral Dna ◽  
Finger Protein ◽  
Wide Range ◽  
Infected Cells ◽  
Cellular Zinc

ABSTRACTHuman adenovirus (HAdV) encodes a multifunctional DNA-binding protein pVII, which is involved in virus DNA packaging and extracellular immune signaling regulation. Although the pVII is an essential viral protein, its exact role in the virus life cycle and interplay with cellular proteins have remained to a large extent unclear. We have recently identified the cellular zinc finger protein 622 (ZNF622) as a potential pVII-interacting protein. In this study, we describe the functional consequences of the ZNF622-pVII interplay and the role of ZNF622 in the HAdV life cycle. ZNF622 protein expression increased, and it accumulated similarly to the pVII protein in the nuclei of virus-infected cells. The lack of the ZNF622 protein specifically increased pVII binding to viral DNA in the infected cells and elevated the pVII protein levels in the purified virions. In addition, ZNF622 knockout cells showed an increased cell lysis and enhanced accumulation of the infectious virus particles. Protein interaction studies revealed that ZNF622 forms a trimeric complex with the pVII protein and the cellular histone chaperon protein nucleophosmin 1 (NPM1). The integrity of this complex is important since ZNF622 mutations and NPM1 deficiency changed pVII ability to bind viral DNA. Collectively, our results implicate that ZNF622 may act as a cellular antiviral protein hindering lytic HAdV growth and limiting pVII protein binding to viral DNA.IMPORTANCEHuman adenoviruses (HAdVs) are common human pathogens causing a wide range of acute infections. To counteract viral pathogenicity, cells encode a variety of antiviral proteins and noncoding RNAs to block virus growth. In this study, we show that the cellular zinc finger protein 622 (ZNF622) interacts with an essential HAdV protein known as pVII. This mutual interaction limits pVII binding to viral DNA. Further, ZNF622 has a role in HAdV life cycle since the lack of ZNF622 correlates with increased lysis of the infected cells and accumulation of the infectious virions. Together, our study reveals a novel cellular antiviral protein ZNF622, which may impede lytic HAdV growth.

scholarly journals SARS-CoV-2 Is Restricted by Zinc Finger Antiviral Protein despite Preadaptation to the Low-CpG Environment in Humans

mBio ◽  
2020 ◽  
Vol 11 (5) ◽  
Author(s):  
Rayhane Nchioua ◽  
Dorota Kmiec ◽  
Janis A. Müller ◽  
Carina Conzelmann ◽  
Rüdiger Groß ◽  
...  
Keyword(s):  
Zinc Finger ◽  
Human Lung ◽  
Lung Cells ◽  
Type I ◽  
Antiviral Protein ◽  
Viral Pathogen ◽  
Cpg Dinucleotides ◽  
Human Lung Cells ◽  
Ifn Γ ◽  
Horseshoe Bat

ABSTRACT Recent evidence shows that severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is sensitive to interferons (IFNs). However, the most effective types of IFNs and the underlying antiviral effectors remain to be defined. Here, we show that zinc finger antiviral protein (ZAP), which preferentially targets CpG dinucleotides in viral RNA sequences, restricts SARS-CoV-2. We further demonstrate that ZAP and its cofactors KHNYN and TRIM25 are expressed in human lung cells. Type I, II, and III IFNs all strongly inhibited SARS-CoV-2 and further induced ZAP expression. Comprehensive sequence analyses revealed that SARS-CoV-2 and its closest relatives from horseshoe bats showed the strongest CpG suppression among all known human and bat coronaviruses, respectively. Nevertheless, endogenous ZAP expression restricted SARS-CoV-2 replication in human lung cells, particularly upon treatment with IFN-α or IFN-γ. Both the long and the short isoforms of human ZAP reduced SARS-CoV-2 RNA expression levels, but the former did so with greater efficiency. Finally, we show that the ability to restrict SARS-CoV-2 is conserved in ZAP orthologues of the reservoir bat and potential intermediate pangolin hosts of human coronaviruses. Altogether, our results show that ZAP is an important effector of the innate response against SARS-CoV-2, although this pandemic pathogen emerged from zoonosis of a coronavirus that was preadapted to the low-CpG environment in humans. IMPORTANCE Although interferons inhibit SARS-CoV-2 and have been evaluated for treatment of coronavirus disease 2019 (COVID-19), the most effective types and antiviral effectors remain to be defined. Here, we show that IFN-γ is particularly potent in restricting SARS-CoV-2 and in inducing expression of the antiviral factor ZAP in human lung cells. Knockdown experiments revealed that endogenous ZAP significantly restricts SARS-CoV-2. We further show that CpG dinucleotides which are specifically targeted by ZAP are strongly suppressed in the SARS-CoV-2 genome and that the two closest horseshoe bat relatives of SARS-CoV-2 show the lowest genomic CpG content of all coronavirus sequences available from this reservoir host. Nonetheless, both the short and long isoforms of human ZAP reduced SARS-CoV-2 RNA levels, and this activity was conserved in horseshoe bat and pangolin ZAP orthologues. Our findings indicating that type II interferon is particularly efficient against SARS-CoV-2 and that ZAP restricts this pandemic viral pathogen might promote the development of effective immune therapies against COVID-19.

scholarly journals Inhibition of Filovirus Replication by the Zinc Finger Antiviral Protein

2006 ◽  
Vol 81 (5) ◽  
pp. 2391-2400 ◽  
Author(s):  
Stefanie Müller ◽  
Peggy Möller ◽  
Matthew J. Bick ◽  
Stephanie Wurr ◽  
Stephan Becker ◽  
...  
Keyword(s):  
Zinc Finger ◽  
Sindbis Virus ◽  
Time Course ◽  
Ebola Virus ◽  
Leukemia Virus ◽  
Inhibitory Effect ◽  
Marburg Virus ◽  
Moloney Murine Leukemia Virus ◽  
Zinc Finger Motif ◽  
Antiviral Protein

ABSTRACT The zinc finger antiviral protein (ZAP) was recently shown to inhibit Moloney murine leukemia virus and Sindbis virus replication. We tested whether ZAP also acts against Ebola virus (EBOV) and Marburg virus (MARV). Antiviral effects were observed after infection of cells expressing the N-terminal part of ZAP fused to the product of the zeocin resistance gene (NZAP-Zeo) as well as after infection of cells inducibly expressing full-length ZAP. EBOV was inhibited by up to 4 log units, whereas MARV was inhibited between 1 to 2 log units. The activity of ZAP was dependent on the integrity of the second and fourth zinc finger motif, as tested with cell lines expressing NZAP-Zeo mutants. Heterologous expression of EBOV- and MARV-specific sequences fused to a reporter gene suggest that ZAP specifically targets L gene sequences. The activity of NZAP-Zeo in this assay was also dependent on the integrity of the second and fourth zinc finger motif. Time-course experiments with infectious EBOV showed that ZAP reduces the level of L mRNA before the level of genomic or antigenomic RNA is affected. Transient expression of ZAP decreased the activity of an EBOV replicon system by up to 95%. This inhibitory effect could be partially compensated for by overexpression of L protein. In conclusion, the data demonstrate that ZAP exhibits antiviral activity against filoviruses, presumably by decreasing the level of viral mRNA.

scholarly journals TRIM25 Is Required for the Antiviral Activity of Zinc Finger Antiviral Protein

2017 ◽  
Vol 91 (9) ◽  
Author(s):  
Xiaojiao Zheng ◽  
Xinlu Wang ◽  
Fan Tu ◽  
Qin Wang ◽  
Zusen Fan ◽  
...  
Keyword(s):  
Antiviral Activity ◽  
Zinc Finger ◽  
Ebola Virus ◽  
Rna Binding ◽  
E3 Ligase ◽  
Antiviral Protein ◽  
Viral Mrnas ◽  
Target Mrna ◽  
Ubiquitin E3 Ligase ◽  
Target Rna

ABSTRACTZinc finger antiviral protein (ZAP) is a host factor that specifically inhibits the replication of certain viruses by binding to viral mRNAs and repressing the translation and/or promoting the degradation of target mRNA. In addition, ZAP regulates the expression of certain cellular genes. Here, we report that tripartite motif-containing protein 25 (TRIM25), a ubiquitin E3 ligase, is required for the antiviral activity of ZAP. Downregulation of endogenous TRIM25 abolished ZAP's antiviral activity. The E3 ligase activity of TRIM25 is required for this regulation. TRIM25 mediated ZAP ubiquitination, but the ubiquitination of ZAP itself did not seem to be required for its antiviral activity. Downregulation of endogenous ubiquitin or overexpression of the deubiquitinase OTUB1 impaired ZAP's activity. We provide evidence indicating that TRIM25 modulates the target RNA binding activity of ZAP. These results uncover a mechanism by which the antiviral activity of ZAP is regulated.IMPORTANCEZAP is a host antiviral factor that specifically inhibits the replication of certain viruses, including HIV-1, Sindbis virus, and Ebola virus. ZAP binds directly to target mRNA, and it represses the translation and promotes the degradation of target mRNA. While the mechanisms by which ZAP posttranscriptionally inhibits target RNA expression have been extensively studied, how its antiviral activity is regulated is not very clear. Here, we report that TRIM25, a ubiquitin E3 ligase, is required for the antiviral activity of ZAP. Downregulation of endogenous TRIM25 remarkably abolished ZAP's activity. TRIM25 is required for ZAP optimal binding to target mRNA. These results help us to better understand how the antiviral activity of ZAP is regulated.

scholarly journals Does the Zinc Finger Antiviral Protein (ZAP) Shape the Evolution of Herpesvirus Genomes?

Viruses ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1857
Author(s):  
Yao-Tang Lin ◽  
Long-Fung Chau ◽  
Hannah Coutts ◽  
Matin Mahmoudi ◽  
Vayalena Drampa ◽  
...  
Keyword(s):  
Gene Expression ◽  
Zinc Finger ◽  
Gc Content ◽  
Nucleotide Composition ◽  
Antiviral Protein ◽  
Dna Viruses ◽  
Cpg Dinucleotides ◽  
Host Restriction ◽  
Counter Measures ◽  
Cpg Dinucleotide

An evolutionary arms race occurs between viruses and hosts. Hosts have developed an array of antiviral mechanisms aimed at inhibiting replication and spread of viruses, reducing their fitness, and ultimately minimising pathogenic effects. In turn, viruses have evolved sophisticated counter-measures that mediate evasion of host defence mechanisms. A key aspect of host defences is the ability to differentiate between self and non-self. Previous studies have demonstrated significant suppression of CpG and UpA dinucleotide frequencies in the coding regions of RNA and small DNA viruses. Artificially increasing these dinucleotide frequencies results in a substantial attenuation of virus replication, suggesting dinucleotide bias could facilitate recognition of non-self RNA. The interferon-inducible gene, zinc finger antiviral protein (ZAP) is the host factor responsible for sensing CpG dinucleotides in viral RNA and restricting RNA viruses through direct binding and degradation of the target RNA. Herpesviruses are large DNA viruses that comprise three subfamilies, alpha, beta and gamma, which display divergent CpG dinucleotide patterns within their genomes. ZAP has recently been shown to act as a host restriction factor against human cytomegalovirus (HCMV), a beta-herpesvirus, which in turn evades ZAP detection by suppressing CpG levels in the major immediate-early transcript IE1, one of the first genes expressed by the virus. While suppression of CpG dinucleotides allows evasion of ZAP targeting, synonymous changes in nucleotide composition that cause genome biases, such as low GC content, can cause inefficient gene expression, especially in unspliced transcripts. To maintain compact genomes, the majority of herpesvirus transcripts are unspliced. Here we discuss how the conflicting pressures of ZAP evasion, the need to maintain compact genomes through the use of unspliced transcripts and maintaining efficient gene expression may have shaped the evolution of herpesvirus genomes, leading to characteristic CpG dinucleotide patterns.

scholarly journals The zinc finger antiviral protein ZAP destabilises viral transcripts and restricts human cytomegalovirus

2020 ◽  
Author(s):  
Ana Cristina Gonzalez-Perez ◽  
Markus Stempel ◽  
Emanuel Wyler ◽  
Christian Urban ◽  
Antonio Piras ◽  
...  
Keyword(s):  
Zinc Finger ◽  
Human Cytomegalovirus ◽  
Hcmv Infection ◽  
High Morbidity ◽  
Antiviral Protein ◽  
Rna Sequences ◽  
Dna Viruses ◽  
Hcmv Replication ◽  
Antiviral Role

AbstractInterferon-stimulated gene products (ISGs) play a crucial role in early infection control. The ISG zinc finger CCCH-type antiviral protein 1 (ZAP/ZC3HAV1) antagonises several RNA viruses by binding to CG-rich RNA sequences, whereas its effect on DNA viruses is largely unknown. Here, we decipher the role of ZAP in the context of human cytomegalovirus (HCMV) infection, a β-herpesvirus that is associated with high morbidity in immunosuppressed individuals and newborns. We show that expression of the two major isoforms of ZAP, the long (ZAP-L) and short (ZAP-S), is induced during HCMV infection and that both negatively affect HCMV replication. Transcriptome and proteome analyses demonstrated that the expression of ZAP decelerates the progression of HCMV infection. SLAM-sequencing revealed that ZAP restricts HCMV at early stages of infection by destabilising a distinct subset of viral transcripts with low CG content. In summary, this report provides evidence of an important antiviral role for ZAP in host defense against HCMV infection and highlights its differentiated function during DNA virus infection.

scholarly journals The Zinc Finger Antiviral Protein Acts Synergistically with an Interferon-Induced Factor for Maximal Activity against Alphaviruses

2007 ◽  
Vol 81 (24) ◽  
pp. 13509-13518 ◽  
Author(s):  
Margaret R. MacDonald ◽  
Erica S. Machlin ◽  
Owen R. Albin ◽  
David E. Levy
Keyword(s):  
Cell Death ◽  
Antiviral Activity ◽  
Zinc Finger ◽  
Type I Interferons ◽  
Type I ◽  
Antiviral Protein ◽  
Virus Family ◽  
Bhk Cells ◽  
Antiviral State ◽  
Virion Production

ABSTRACT Type I interferons (IFNs) signal through specific receptors to mediate expression of genes, which together confer a cellular antiviral state. Overexpression of the zinc finger antiviral protein (ZAP) imparts a cellular antiviral state against Retroviridae, Togaviridae, and Filoviridae virus family members. Since ZAP expression is induced by IFN, we utilized Sindbis virus (SINV) to investigate the role of other IFN-induced factors in ZAP's inhibitory potential. Overexpressed ZAP did not inhibit virion production or SINV-induced cell death in BHK cells deficient in IFN production (and thus IFN signaling), suggesting a role for an IFN-induced factor in ZAP's activity. IFN pretreatment in the presence of ZAP resulted in greater inhibition than IFN alone. Using mouse embryo fibroblast (MEF) cells deficient in Stat1, we showed that signaling through the IFN receptor is necessary for IFN′s enhancement of ZAP activity. Unlike in BHK cells, however, overexpressed ZAP exhibited antiviral activity in the absence of IFN. In wild-type MEFs with an intact Stat1 gene, IFN pretreatment synergized with ZAP to generate a potent antiviral response. Despite failing to inhibit SINV virion production and virus-induced cell death in BHK cells, ZAP inhibited translation of the incoming viral RNA. IFN pretreatment synergized with ZAP to further block protein expression from the incoming viral genome. We further show that silencing of IFN-induced ZAP reduces IFN efficacy. Our findings demonstrate that ZAP can synergize with another IFN-induced factor(s) for maximal antiviral activity and that ZAP's intrinsic antiviral activity on virion production and cell survival can have cell-type-specific outcomes.

UPDATE ON 'MOLECULAR SCISSORS' FOR TRANSGENIC FARM ANIMAL PRODUCTION

2013 ◽  
Vol 25 (1) ◽  
pp. 317 ◽  
Author(s):  
Björn Petersen
Keyword(s):  
Amino Acids ◽  
Dna Sequence ◽  
Zinc Finger ◽  
Gene Knockout ◽  
Human Cells ◽  
Farm Animal ◽  
Transcription Activator ◽  
A Genome ◽  
Human Ipscs ◽  
Wide Range

Molecular scissors, such as meganucleases, zinc-finger nucleases (ZFN), and transcription activator-like effector nucleases (TALEN), are valuable tools for generating double-strand breaks (DSB) in the genome that can lead to a functional knockout of the targeted gene or used to integrate a DNA sequence at a specific locus in the genome. Especially in farm animal species from which true pluripotent embryonic stem cells have not been established, these molecular scissors are a new option for engineering the genome in a way that was not feasible before. Meganucleases (also called homing nucleases) are natural proteins found in many single-cell organisms that are mainly involved in the cell’s repair mechanism after a strand break occurs. They are capable of recognising their binding site by identifying a sequence containing between 12 and >30 base pairs. The prototype enzyme for demonstrating DSB stimulation of gene targeting was I-SceI, which has a long recognition site (I-SceI 18 bp). The recognition specificity of enzymes such as I-SceI can be modified to be specific for a desired sequence within the genome. The use of meganucleases to genetically modify organisms has proved very successful in several species, including frog, fly, fish, plants, and human cells, but the intimate connection between the recognition and cleavage elements in the protein structure makes it difficult to alter one without affecting the other. The class of targeting reagents that has proved the most versatile and effective in recent years is that of ZFN. The ZFN possess separate DNA-binding and cleavage domains, which facilitate design according to the desired target. These molecules originate from the natural type IIS restriction enzyme FokI (Li et al. 1992 Proc. Natl. Acad. Sci. USA 89, 4275–4279). The cleavage domain has no sequence specificity and the binding domain can be used to make ZFN specific to a targeted sequence. The requirement for dimerisation of the FokI makes ZFN even more specific and avoids off-target events, as a monomeric cleavage does not occur at single binding sites. One zinc-finger molecule is specific for a base triplet; joining several zinc-finger molecules is sufficient to pick out a single target in a complex genome. ZFN have been used to modify the genome of several species as Xenopus, drosophila, C. elegans, zebrafish, rat, mouse, human cells, hamster cells, rabbit, pigs, and cattle. Different methods have been used to alter the host genomes either by ZFN mRNA or DNA injection into zygotes or by transfection of somatic cells followed by somatic cell nuclear transfer. Even a direct delivery of ZFN proteins can generate a targeted mutation (Gaj et al. 2012 Nat. Methods 9, 805–807). The efficiency of ZFN-mediated knockout was increased up to 10,000-fold compared with traditional gene knockout by homologous recombination. Rarely, off-target events were described but most were located in an intergenic or intronic region of the genome. Transcription activator-like effectors are a family of virulence factors produced by a genus of plant pathogens, Xanthomonas spp. The proteins naturally comprise 17 to 18 repeats of 34 amino acids. The binding specificity is determined by the amino acids at positions 12 and 13 within each repeat. Combined with an endonuclease, TALEs (referred to as TALENs) can be used to specifically target almost any known genomic sequence. The main difference between ZFNs and TALENs is the recognition of the DNA sequence. While ZFNs recognise nucleotide triplets, TALENs recognise single nucleotides, rendering TALENs, in theory, adjustable to any given sequence in a genome while ZFNs need defined prerequisites to be specific. TALENs have already been used to alter the genomes of rats, zebrafish, human iPSCs, and pigs (personal communication). Molecular scissors open a wide range of new applications for modifying the genome of different species or cells with which it has remained very difficult to work. Breeding for agricultural purposes and biomedicine, including the development of large animal models for human diseases and xenotransplantation, will greatly benefit from these new tools. With the advent of ZFN- and TALEN-mediated gene knockouts, mammalian transgenesis has taken a major leap forward as a straightforward technology for gene knockout and knock-in.

scholarly journals ZAP, a CCCH-Type Zinc Finger Protein, Inhibits Porcine Reproductive and Respiratory Syndrome Virus Replication and Interacts with Viral Nsp9

2019 ◽  
Vol 93 (10) ◽  
Author(s):  
Yongxiang Zhao ◽  
Zhongbao Song ◽  
Juan Bai ◽  
Xuewei Liu ◽  
Hans Nauwynck ◽  
...  
Keyword(s):  
Amino Acids ◽  
Zinc Finger ◽  
Transcriptome Sequencing ◽  
Zinc Finger Protein ◽  
Early Stage ◽  
Respiratory Syndrome Virus ◽  
Type I ◽  
Zinc Finger Domain ◽  
Antiviral Protein ◽  
Finger Protein

ABSTRACTPorcine reproductive and respiratory syndrome virus (PRRSV) is one of the most economically important pathogens affecting many swine-producing regions. Current vaccination strategies and antiviral drugs provide only limited protection. PRRSV infection can cleave mitochondrial antiviral signaling protein (MAVS) and inhibit the induction of type I interferon. The antiviral effector molecules that are involved in host protective responses to PRRSV infection are not fully understood. Here, by using transcriptome sequencing, we found that a zinc finger antiviral protein, ZAP, is upregulated in MAVS-transfected Marc-145 cells and that ZAP suppresses PRRSV infection at the early stage of replication. We also found that the viral protein Nsp9, an RNA-dependent RNA polymerase (RdRp), interacts with ZAP. The interacting locations were mapped to the zinc finger domain of ZAP and N-terminal amino acids 150 to 160 of Nsp9. These findings suggest that ZAP is an effective antiviral factor for suppressing PRRSV infection, and they shed light on virus-host interaction.IMPORTANCEPRRSV continues to adversely impact the global swine industry. It is important to understand the various antiviral factors against PRRSV infection. Here, a zinc finger protein, termed ZAP, was screened from MAVS-induced antiviral genes by transcriptome sequencing, and it was found to remarkably suppress PRRSV replication and interact with PRRSV Nsp9. The zinc finger domain of ZAP and amino acids 150 to 160 of Nsp9 are responsible for the interaction. These findings expand the antiviral spectrum of ZAP and provide a better understanding of ZAP antiviral mechanisms, as well as virus-host interactions.

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