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Li L, Liu Z, Liang R, Yang M, Yan Y, Jiao Y, Jiao Z, Hu X, Li M, Shen Z, Peng G. Novel mutation N588 residue in the NS1 protein of feline parvovirus greatly augments viral replication. J Virol 2024; 98:e0009324. [PMID: 38591899 PMCID: PMC11092363 DOI: 10.1128/jvi.00093-24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Accepted: 03/19/2024] [Indexed: 04/10/2024] Open
Abstract
Feline parvovirus (FPV) infection is highly fatal in felines. NS1, which is a key nonstructural protein of FPV, can inhibit host innate immunity and promote viral replication, which is the main reason for the severe pathogenicity of FPV. However, the mechanism by which the NS1 protein disrupts host immunity and regulates viral replication is still unclear. Here, we identified an FPV M1 strain that is regulated by the NS1 protein and has more pronounced suppression of innate immunity, resulting in robust replication. We found that the neutralization titer of the FPV M1 strain was significantly lower than that of the other strains. Moreover, FPV M1 had powerful replication ability, and the FPV M1-NS1 protein had heightened efficacy in repressing interferon-stimulated genes (ISGs) expression. Subsequently, we constructed an FPV reverse genetic system, which confirmed that the N588 residue of FPV M1-NS1 protein is a key amino acid that bolsters viral proliferation. Recombinant virus containing N588 also had stronger ability to inhibit ISGs, and lower ISGs levels promoted viral replication and reduced the neutralization titer of the positive control serum. Finally, we confirmed that the difference in viral replication was abolished in type I IFN receptor knockout cell lines. In conclusion, our results demonstrate that the N588 residue of the NS1 protein is a critical amino acid that promotes viral proliferation by increasing the inhibition of ISGs expression. These insights provide a reference for studying the relationship between parvovirus-mediated inhibition of host innate immunity and viral replication while facilitating improved FPV vaccine production.IMPORTANCEFPV infection is a viral infectious disease with the highest mortality rate in felines. A universal feature of parvovirus is its ability to inhibit host innate immunity, and its ability to suppress innate immunity is mainly accomplished by the NS1 protein. In the present study, FPV was used as a viral model to explore the mechanism by which the NS1 protein inhibits innate immunity and regulates viral replication. Studies have shown that the FPV-NS1 protein containing the N588 residue strongly inhibits the expression of host ISGs, thereby increasing the viral proliferation titer. In addition, the presence of the N588 residue can increase the proliferation titer of the strain 5- to 10-fold without affecting its virulence and immunogenicity. In conclusion, our findings provide new insights and guidance for studying the mechanisms by which parvoviruses suppress innate immunity and for developing high-yielding FPV vaccines.
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Affiliation(s)
- Lisha Li
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, China
| | - Zirui Liu
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, China
| | - Rui Liang
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, China
| | - Mengfang Yang
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, China
| | - Yuanyuan Yan
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, China
| | - Yuzhou Jiao
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, China
| | - Zhe Jiao
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, China
| | - Xiaoshuai Hu
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, China
| | - Mengxia Li
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, China
| | - Zhou Shen
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, China
| | - Guiqing Peng
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, China
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Xie Q, Wang J, Gu C, Wu J, Liu W. Structure and function of the parvoviral NS1 protein: a review. Virus Genes 2023; 59:195-203. [PMID: 36253516 DOI: 10.1007/s11262-022-01944-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Accepted: 10/07/2022] [Indexed: 10/24/2022]
Abstract
Parvoviruses possess a single-stranded DNA genome of about 5 kb, which contains two open reading frames (ORFs), one encoding nonstructural (NS) proteins, the other capsid proteins. The NS1 protein contains an N-terminal origin-binding domain, a helicase domain, and a C-terminal transactive domain, and is essential for effective viral replication and production of infectious virus. We first summarize the developments in the structure of NS1 protein, including the original binding domain and the helicase domain. We discuss the role of different DNA substrates in the oligomerization of these two domains of NS1. During the parvovirus life cycle, the NS1 protein is closely related to the viral gene expression, viral replication, and infection. We provide the current understanding of the impact of parvovirus NS1 protein mutations on its biological properties. Overall, in this review, we focus on the structure and function of the parvoviral NS1 protein.
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Affiliation(s)
- Qianqian Xie
- State Key Laboratory of Agrobiotechnology, Department of Biochemistry and Molecular Biology, College of Biological Sciences, China Agricultural University, Beijing, 100193, China
| | - Jigui Wang
- State Key Laboratory of Agrobiotechnology, Department of Biochemistry and Molecular Biology, College of Biological Sciences, China Agricultural University, Beijing, 100193, China
| | - Chenchen Gu
- State Key Laboratory of Agrobiotechnology, Department of Biochemistry and Molecular Biology, College of Biological Sciences, China Agricultural University, Beijing, 100193, China
| | - Jing Wu
- State Key Laboratory of Agrobiotechnology, Department of Biochemistry and Molecular Biology, College of Biological Sciences, China Agricultural University, Beijing, 100193, China
| | - Weiquan Liu
- State Key Laboratory of Agrobiotechnology, Department of Biochemistry and Molecular Biology, College of Biological Sciences, China Agricultural University, Beijing, 100193, China.
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3
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Transcriptional activation of Mink enteritis virus VP2 by the C-terminal of its NS1 protein. Virus Genes 2023; 59:100-108. [PMID: 36272032 DOI: 10.1007/s11262-022-01947-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Accepted: 10/13/2022] [Indexed: 01/13/2023]
Abstract
Mink enteritis virus (MEV) NS1 is a multidomain and multifunctional protein containing origin binding, helicase, and transactivation domains. In particular, parvoviral NS1 proteins are transactivators of the viral capsid protein promoter although the manner by which they exert these transactivation effects remained unclear. In this study, the region of the transactivation domain of the NS1 C-terminal was found located at aa 557 ~ 668 and any deletion within this region reduced the transactivation activity. A dominant negative mutation of the 63 aa deletion in the C-terminal of NS1 protein resulted in loss of ability to activate P38 and VP2-5'UTR in a dual-luciferase reporter assay system, a VP2 protein expression system, and within the whole MEV genome, independent of downstream genes. Additionally, a full-length MEV clone deficient in its NS1 C-terminal failed to rescue the virus, possibly due to the loss of integrity of DNA sequences interacting with NS1 protein, and expression of VP2 was also inhibited even when normal NS1 protein was supplied in trans.
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4
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Xie Q, Wang J, Su J, Gu C, Wu J, Xiao J, Liu W. Inhibition of transcription of VP2 by mutations in the DNA binding domains of mink enteritis virus NS1 protein. Virus Res 2023; 323:198972. [PMID: 36261066 PMCID: PMC10194145 DOI: 10.1016/j.virusres.2022.198972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 10/14/2022] [Accepted: 10/15/2022] [Indexed: 11/09/2022]
Abstract
The NS1 protein of mink enteritis virus (MEV) is a multidomain and multifunctional protein that plays a critical role in viral replication, with predicted nuclease, helicase and transactivation activities. The nuclease and helicase domains of NS1 protein are involved in interaction with viral DNA. Herein, potential amino acids critical for DNA binding in the MEV NS1 were mutated, all of which resulted in a termination of viral production from an infectious MEV clone. Although E121, H129/131, Y212 and K470/472 mutants retained their P38 and 5'UTR transactivation activity, K196/197 and K406 mutations eliminated this. Interestingly, VP2 protein was produced following transfection of F81 cells with pMEV-NS1-196K2G (K196G and K197G) and pMEV-NS1-K406G when pNS1 was co-transfected in trans, indicating that the substitutions did not affect the integrity of the DNA sequence that bound to NS1 protein but inhibited the biological properties of NS1 protein itself. The ability of NS1 protein to interact with SP1 was inhibited by both 196K2G and K406G substitutions, while 196K2G resulted in failure to bind to the DNA-binding sites in the P38 promoter, and the oligomerization of K406G was inhibited. All of these could explain the transcriptional repression.
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Affiliation(s)
- Qianqian Xie
- State Key Laboratory of Agrobiotechnology, Department of Biochemistry and Molecular Biology, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Jigui Wang
- State Key Laboratory of Agrobiotechnology, Department of Biochemistry and Molecular Biology, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Jun Su
- State Key Laboratory of Agrobiotechnology, Department of Biochemistry and Molecular Biology, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Chenchen Gu
- State Key Laboratory of Agrobiotechnology, Department of Biochemistry and Molecular Biology, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Jing Wu
- State Key Laboratory of Agrobiotechnology, Department of Biochemistry and Molecular Biology, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Jun Xiao
- Department of Geriatrics, the Eight Medical Centre, Chinese PLA General Hospital, Beijing, China.
| | - Weiquan Liu
- State Key Laboratory of Agrobiotechnology, Department of Biochemistry and Molecular Biology, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
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5
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Hao X, Chen H, Li Y, Chen B, Liang W, Xiao X, Zhou P, Li S. Molecular characterization and antiviral effects of canine interferon regulatory factor 1 (CaIRF1). BMC Vet Res 2022; 18:440. [PMID: 36522721 PMCID: PMC9756622 DOI: 10.1186/s12917-022-03539-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Accepted: 12/01/2022] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND Interferon regulatory factor 1 (IRF1) is an important transcription factor that activates the type I interferon (IFN-I) response and plays a vital role in the antiviral immune response. Although IRF1 has been identified in several mammals, little information related to its function in canines has been described. RESULTS In this study, canine IRF1 (CaIRF1) was cloned. After a series of bioinformatics analyses, we found that the CaIRF1 protein structure was similar to that of other animal IRF1 proteins, including a conserved DNA-binding domain (DBD), an IRF-association domain 2 (IAD2) domain and two nuclear localization signals (NLSs). An indirect immunofluorescence assay (IFA) revealed that CaIRF1 was mainly distributed in the nucleus. Overexpression of CaIRF1 in Madin-Darby canine kidney cells (MDCK) induced high levels of interferon β (IFNβ) and IFN-stimulated response element (ISRE) promoter activation and induced interferon-stimulated gene (ISG) expression. Subsequently, we assayed the antiviral activity of CaIRF1 against vesicular stomatitis virus (VSV) and canine parvovirus type-2 (CPV-2) in MDCK cells. Overexpression of CaIRF1 effectively inhibited the viral yields of VSV and CPV-2, while knocking down of CaIRF1 expression mildly increased viral gene copies. CONCLUSIONS CaIRF1 is involved in the cellular IFN-I signaling pathway and plays an important role in the antiviral response.
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Affiliation(s)
- Xiangqi Hao
- grid.20561.300000 0000 9546 5767College of Veterinary Medicine, South China Agricultural University, Guangzhou, Guangdong Province, 510642 People’s Republic of China ,grid.484195.5Guangdong Provincial Key Laboratory of Prevention and Control for Severe Clinical Animal Diseases, Guangzhou, Guangdong Province, 510642 People’s Republic of China ,Guangdong Provincial Pet Engineering Technology Research Center, Guangzhou, Guangdong Province, 510642 People’s Republic of China
| | - Hui Chen
- grid.20561.300000 0000 9546 5767College of Veterinary Medicine, South China Agricultural University, Guangzhou, Guangdong Province, 510642 People’s Republic of China ,grid.484195.5Guangdong Provincial Key Laboratory of Prevention and Control for Severe Clinical Animal Diseases, Guangzhou, Guangdong Province, 510642 People’s Republic of China ,Guangdong Provincial Pet Engineering Technology Research Center, Guangzhou, Guangdong Province, 510642 People’s Republic of China
| | - Yanchao Li
- grid.20561.300000 0000 9546 5767College of Veterinary Medicine, South China Agricultural University, Guangzhou, Guangdong Province, 510642 People’s Republic of China ,grid.484195.5Guangdong Provincial Key Laboratory of Prevention and Control for Severe Clinical Animal Diseases, Guangzhou, Guangdong Province, 510642 People’s Republic of China ,Guangdong Provincial Pet Engineering Technology Research Center, Guangzhou, Guangdong Province, 510642 People’s Republic of China
| | - Bo Chen
- grid.20561.300000 0000 9546 5767College of Veterinary Medicine, South China Agricultural University, Guangzhou, Guangdong Province, 510642 People’s Republic of China ,grid.484195.5Guangdong Provincial Key Laboratory of Prevention and Control for Severe Clinical Animal Diseases, Guangzhou, Guangdong Province, 510642 People’s Republic of China ,Guangdong Provincial Pet Engineering Technology Research Center, Guangzhou, Guangdong Province, 510642 People’s Republic of China
| | - Weifeng Liang
- grid.20561.300000 0000 9546 5767College of Veterinary Medicine, South China Agricultural University, Guangzhou, Guangdong Province, 510642 People’s Republic of China
| | - Xiangyu Xiao
- grid.20561.300000 0000 9546 5767College of Veterinary Medicine, South China Agricultural University, Guangzhou, Guangdong Province, 510642 People’s Republic of China ,grid.484195.5Guangdong Provincial Key Laboratory of Prevention and Control for Severe Clinical Animal Diseases, Guangzhou, Guangdong Province, 510642 People’s Republic of China ,Guangdong Provincial Pet Engineering Technology Research Center, Guangzhou, Guangdong Province, 510642 People’s Republic of China
| | - Pei Zhou
- grid.20561.300000 0000 9546 5767College of Veterinary Medicine, South China Agricultural University, Guangzhou, Guangdong Province, 510642 People’s Republic of China ,grid.484195.5Guangdong Provincial Key Laboratory of Prevention and Control for Severe Clinical Animal Diseases, Guangzhou, Guangdong Province, 510642 People’s Republic of China ,Guangdong Provincial Pet Engineering Technology Research Center, Guangzhou, Guangdong Province, 510642 People’s Republic of China
| | - Shoujun Li
- grid.20561.300000 0000 9546 5767College of Veterinary Medicine, South China Agricultural University, Guangzhou, Guangdong Province, 510642 People’s Republic of China ,grid.484195.5Guangdong Provincial Key Laboratory of Prevention and Control for Severe Clinical Animal Diseases, Guangzhou, Guangdong Province, 510642 People’s Republic of China ,Guangdong Provincial Pet Engineering Technology Research Center, Guangzhou, Guangdong Province, 510642 People’s Republic of China
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6
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SP1/miR-92a-1-5p/SOCS5: A novel regulatory axis in feline panleukopenia virus replication. Vet Microbiol 2022; 273:109549. [PMID: 36037621 DOI: 10.1016/j.vetmic.2022.109549] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 08/17/2022] [Accepted: 08/20/2022] [Indexed: 11/20/2022]
Abstract
MicroRNAs (miRNAs) are vital post-transcriptional regulators that participate in host-pathogen interactions by modulating the expression of cellular factors. Previous studies have demonstrated that feline panleukopenia virus (FPV) alters miRNA expression levels within host cells. However, the relationship between FPV replication and host miRNAs remains unclear. Here, we demonstrated that FPV infection significantly altered cellular miR-92a-1-5p expression in F81 cells by upregulating the expression of specificity protein 1 (SP1). Furthermore, we observed that miR-92a-1-5p enhanced interferon (IFN-α/β) expression by targeting the suppressors of cytokine signaling 5 (SOCS5) that negatively regulates NF-κB signaling and inhibits FPV replication in host cells. These findings revealed that miR-92a-1-5p plays a crucial role in host defense against FPV infection.
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7
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Induction of COX-2 by feline calicivirus via activation of the MEK1-ERK1/2 pathway, and attenuation of feline lung inflammation and injury by MEK1 inhibitor AZD6244 (selumetinib). Biochem Biophys Res Commun 2022; 604:8-13. [DOI: 10.1016/j.bbrc.2022.02.060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Accepted: 02/17/2022] [Indexed: 11/23/2022]
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8
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Chen S, Miao B, Chen N, Chen C, Shao T, Zhang X, Chang L, Zhang X, Du Q, Huang Y, Tong D. SYNCRIP facilitates porcine parvovirus viral DNA replication through the alternative splicing of NS1 mRNA to promote NS2 mRNA formation. Vet Res 2021; 52:73. [PMID: 34034820 PMCID: PMC8152309 DOI: 10.1186/s13567-021-00938-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2020] [Accepted: 03/19/2021] [Indexed: 11/10/2022] Open
Abstract
Porcine Parvovirus (PPV), a pathogen causing porcine reproductive disorders, encodes two capsid proteins (VP1 and VP2) and three nonstructural proteins (NS1, NS2 and SAT) in infected cells. The PPV NS2 mRNA is from NS1 mRNA after alternative splicing, yet the corresponding mechanism is unclear. In this study, we identified a PPV NS1 mRNA binding protein SYNCRIP, which belongs to the hnRNP family and has been identified to be involved in host pre-mRNA splicing by RNA-pulldown and mass spectrometry approaches. SYNCRIP was found to be significantly up-regulated by PPV infection in vivo and in vitro. We confirmed that it directly interacts with PPV NS1 mRNA and is co-localized at the cytoplasm in PPV-infected cells. Overexpression of SYNCRIP significantly reduced the NS1 mRNA and protein levels, whereas deletion of SYNCRIP significantly reduced NS2 mRNA and protein levels and the ratio of NS2 to NS1, and further impaired replication of the PPV. Furthermore, we found that SYNCRIP was able to bind the 3'-terminal site of NS1 mRNA to promote the cleavage of NS1 mRNA into NS2 mRNA. Taken together, the results presented here demonstrate that SYNCRIP is a critical molecule in the alternative splicing process of PPV mRNA, while revealing a novel function for this protein and providing a potential target of antiviral intervention for the control of porcine parvovirus disease.
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Affiliation(s)
- Songbiao Chen
- College of Veterinary Medicine, Northwest A&F University, Yangling, China
| | - Bichen Miao
- College of Veterinary Medicine, Northwest A&F University, Yangling, China
| | - Nannan Chen
- College of Veterinary Medicine, Northwest A&F University, Yangling, China
| | - Caiyi Chen
- College of Veterinary Medicine, Northwest A&F University, Yangling, China
| | - Ting Shao
- College of Veterinary Medicine, Northwest A&F University, Yangling, China
| | - Xuezhi Zhang
- College of Veterinary Medicine, Northwest A&F University, Yangling, China
| | - Lingling Chang
- College of Veterinary Medicine, Northwest A&F University, Yangling, China
| | - Xiujuan Zhang
- College of Veterinary Medicine, Northwest A&F University, Yangling, China
| | - Qian Du
- College of Veterinary Medicine, Northwest A&F University, Yangling, China
| | - Yong Huang
- College of Veterinary Medicine, Northwest A&F University, Yangling, China.
| | - Dewen Tong
- College of Veterinary Medicine, Northwest A&F University, Yangling, China.
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9
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Wu H, Jin H, Wang L, Huo N, Liu D, Ding H, Cao Y, Liu C, Xi X, Jiao C, Spibey N, Shi J, Liu Y, Tian K. Generation and immunogenicity of virus-like particles based on mink enteritis virus capsid protein VP2 expressed in Sf9 cells. Arch Virol 2020; 165:2065-2071. [PMID: 32613291 DOI: 10.1007/s00705-020-04703-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 05/14/2020] [Indexed: 11/25/2022]
Abstract
Mink enteritis virus (MEV) is a parvovirus that causes acute enteritis in mink. The capsid protein VP2 of MEV is a major immunogenicity that is important for disease prevention. In this study, this protein was expressed in Spodoptera frugiperda 9 cells using a recombinant baculovirus system and was observed to self-assemble into virus-like particles (VLPs) with a high hemagglutination (HA) titer (1:216). A single-dose injection of VLPs (HA titer, 1:256) resulted in complete protection of mink against virulent MEV challenge for at least 180 days. These data suggest that these MEV VLPs could be used as a vaccine for the prevention of viral enteritis in mink.
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Affiliation(s)
- Hongchao Wu
- National Research Center for Veterinary Medicine, No. 3 Cuiwei Road, High-Tech District, Luoyang, 471003, Henan, China
| | - Hongli Jin
- Changchun SR Biological Technology Co., LTD, Changchun, 130012, Jilin, China
| | - Lingxiao Wang
- National Research Center for Veterinary Medicine, No. 3 Cuiwei Road, High-Tech District, Luoyang, 471003, Henan, China
| | - Ningning Huo
- National Research Center for Veterinary Medicine, No. 3 Cuiwei Road, High-Tech District, Luoyang, 471003, Henan, China
| | - Di Liu
- Changchun SR Biological Technology Co., LTD, Changchun, 130012, Jilin, China
| | - Hangtian Ding
- National Research Center for Veterinary Medicine, No. 3 Cuiwei Road, High-Tech District, Luoyang, 471003, Henan, China
| | - Yujiao Cao
- National Research Center for Veterinary Medicine, No. 3 Cuiwei Road, High-Tech District, Luoyang, 471003, Henan, China
| | - Caihong Liu
- National Research Center for Veterinary Medicine, No. 3 Cuiwei Road, High-Tech District, Luoyang, 471003, Henan, China
| | - Xiangfeng Xi
- National Research Center for Veterinary Medicine, No. 3 Cuiwei Road, High-Tech District, Luoyang, 471003, Henan, China
| | - Cuicui Jiao
- Changchun SR Biological Technology Co., LTD, Changchun, 130012, Jilin, China
| | - Norman Spibey
- National Research Center for Veterinary Medicine, No. 3 Cuiwei Road, High-Tech District, Luoyang, 471003, Henan, China
| | - Jing Shi
- Changchun SR Biological Technology Co., LTD, Changchun, 130012, Jilin, China
| | - Yuxiu Liu
- National Research Center for Veterinary Medicine, No. 3 Cuiwei Road, High-Tech District, Luoyang, 471003, Henan, China.
| | - Kegong Tian
- National Research Center for Veterinary Medicine, No. 3 Cuiwei Road, High-Tech District, Luoyang, 471003, Henan, China.
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10
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Zhang L, Zhao J, Zhai Z, Liang L, Liang R, Cui S. Cellular microRNA, miR-1343-5p, modulates IFN-I responses to facilitate feline panleukopenia virus replication by directly targeting IRAK1 gene. Vet Microbiol 2020; 245:108691. [PMID: 32456817 DOI: 10.1016/j.vetmic.2020.108691] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2020] [Revised: 04/03/2020] [Accepted: 04/10/2020] [Indexed: 12/17/2022]
Abstract
Feline panleukopenia is an acute, highly contagious, and fatal infectious disease caused by feline panleukopenia virus (FPV) and has led to severe consequences on pets, economically important animals, and the wildlife industry. MicroRNAs (miRNAs) play significant roles in the host-pathogen interaction by modulating cellular factors expression which are essential for viral replication or host innate immune response to infection. However, the role of host miRNA response in FPV infection remains to be discovered. In this study, we screened nine host miRNAs associated with FPV infection that were previously implicated in innate immunity or antiviral functions. We found that miR-1343-5p overexpression strongly promoted FPV-BJ04 genomic DNA. Subsequently, the expression of host miR-1343-5p was upregulated by FPV-BJ04 infection in vitro and in vivo. In addition, we demonstrated that miR-1343-5p was a negative regulator of the IFN-I signaling pathway, thereby promoting FPV infection. Bioinformatic analysis combined with molecular biological assay indicated that interleukin-1 receptor-associated kinase 1 (IRAK1) is a putative target of miR-1343-5p. Collectively, our findings emphasize the importance of miR-1343-5p in host defense against FPV, thus, enhancing our understanding of its pathogenic mechanism.
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Affiliation(s)
- Lingling Zhang
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, China; Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Technology of Beijing, Ministry of Agriculture, Beijing, 100193, China
| | - Jingjie Zhao
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, China; Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Technology of Beijing, Ministry of Agriculture, Beijing, 100193, China
| | - Zhian Zhai
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, China; Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Technology of Beijing, Ministry of Agriculture, Beijing, 100193, China
| | - Lin Liang
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, China; Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Technology of Beijing, Ministry of Agriculture, Beijing, 100193, China
| | - Ruiying Liang
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, China; Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Technology of Beijing, Ministry of Agriculture, Beijing, 100193, China.
| | - Shangjin Cui
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, China; Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Technology of Beijing, Ministry of Agriculture, Beijing, 100193, China.
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11
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Chen S, Miao B, Chen N, Zhang X, Zhang X, Du Q, Huang Y, Tong D. A novel porcine parvovirus DNA-launched infectious clone carrying stable double labels as an effective genetic platform. Vet Microbiol 2019; 240:108502. [PMID: 31902505 DOI: 10.1016/j.vetmic.2019.108502] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2019] [Revised: 11/04/2019] [Accepted: 11/04/2019] [Indexed: 10/25/2022]
Abstract
Porcine parvovirus (PPV) is one of the major pathogens causing reproductive failure of swine. However, its specific pathogenesis has not been fully elucidated. Infectious clone is a powerful tool for further studying the pathogenic mechanism of PPV. In the present study, a PPV infectious clone was constructed, and the clone carries His-tag and Flag-tag double-genetic marker at the end of the ns1 gene 3' terminal and vp1 gene 5' terminal, respectively. The PPV DNA fragment F1 (1-182) in 5' end and the other PPV DNA fragment F2 (4788-5074) in 3' end were synthesized and assembled to the lower copy plasmid to construct pKQLL(F1 + F2), while the PPV DNA genome as a template to amplify carrying tags sequence PPV middle DNA fragment F3 and F4 by introducing Flag and His tags sequence in primers. Subsequently, the fused fragment F3/F4 were cloned into the Stu I/Sna B I sites of pKQLL(F1 + F2) plasmid to assemble the complete full-length PPV DNA recombinant plasmids, named as pD-PPV. The pD-PPV was transfected into PK-15 cells to gain rescued PPV virus, designed as D-PPV. Moreover, D-PPV showed similar replicate capability and pathogenicity comparing to the wild-type parental PPV through in vitro and in vivo studies, and the double labels can effectively indicate the expression and localization of viral proteins. Finally, the rescued D-PPV was found to be a convenient tool for antiviral drug screening. These data indicated that the newly established reverse genetic system for PPV would be a useful tool for further studying the pathogenesis mechanisms of PPV, developing labeled vaccine and screening antiviral drug.
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Affiliation(s)
- Songbiao Chen
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi 712100, PR China
| | - Bichen Miao
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi 712100, PR China
| | - Nannan Chen
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi 712100, PR China
| | - Xuezhi Zhang
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi 712100, PR China
| | - Xiujuan Zhang
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi 712100, PR China
| | - Qian Du
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi 712100, PR China
| | - Yong Huang
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi 712100, PR China.
| | - Dewen Tong
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi 712100, PR China.
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Molecular Characterization and Evolutionary Analyses of Carnivore Protoparvovirus 1 NS1 Gene. Viruses 2019; 11:v11040308. [PMID: 30934948 PMCID: PMC6520740 DOI: 10.3390/v11040308] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Revised: 03/22/2019] [Accepted: 03/26/2019] [Indexed: 12/11/2022] Open
Abstract
Carnivore protoparvovirus 1 is the etiological agent of a severe disease of terrestrial carnivores. This unique specie encompasses canine parvovirus type 2 (CPV-2) and feline panleukopenia virus (FPLV). Studies widely analyzed the main capsid protein (VP2), but limited information is available on the nonstructural genes (NS1/NS2). This paper analyzed the NS1 gene sequence of FPLV and CPV strains collected in Italy in 2009–2017, along with worldwide related sequences. Differently from VP2, only one NS1 amino-acid residue (248) clearly and constantly distinguished FPLV from CPV-2, while five possible convergent amino-acid changes were observed that may affect the functional domains of the NS1. Some synonymous mutation in NS1 were non-synonymous in NS2 and vice versa. No evidence for recombination between the two lineages was found, and the predominance of negative selection pressure on NS1 proteins was observed, with low and no overlap between the two lineages in negatively and positively selected codons, respectively. More sites were under selection in the CPV-2 lineage. NS1 phylogenetic analysis showed divergent evolution between FPLV and CPV, and strains were clustered mostly by country and year of detection. We highlight the importance of obtaining the NS1/NS2 coding sequence in molecular epidemiology investigations.
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The 5' Untranslated Region of the Capsid Protein 2 Gene of Mink Enteritis Virus Is Essential for Its Expression. J Virol 2018; 92:JVI.00787-18. [PMID: 29976664 DOI: 10.1128/jvi.00787-18] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 06/14/2018] [Indexed: 12/15/2022] Open
Abstract
Mink enteritis virus (MEV), as a parvovirus, is among the smallest of the animal DNA viruses. The limited genome leads to multifunctional sequences and complex gene expression regulation. Here, we show that the expression of viral capsid protein 2 (VP2) of MEV requires its 5' untranslated regions (5' UTR) which promote VP2 gene expression at both transcriptional and translational levels. The expression of VP2 was inhibited in several common eukaryotic expression vectors. Our data showed that the 5' UTR of VP2 enhanced capsid gene transcription but not increased stability or promotes nucleocytoplasmic export of VP2 mRNA. Analysis of the functions of 5' UTR fragments showed that the proximal region (nucleotides [nt] 1 to 270; that is, positions +1 to +270 relative to the transcription initiation site, nt 2048 to 2317 of MEV-L) of 5' UTR of VP2 was necessary for VP2 transcription and also promoted the activity of P38 promoter. Unexpectedly, further analysis showed that deletion of the distal region (nt 271 to 653) of the 5' UTR of VP2 almost completely abolished VP2 translation in the presence of P38, whereas the transcription was still induced significantly. Furthermore, using a luciferase reporter bicistronic system, we identified that the 5' UTR had an internal ribosome entry site-like function which could be enhanced by NS1 via the site at nt 382 to 447. Mutation of the 5' UTR in the MEV full-length clones further showed that the 5' UTR was required for VP2 gene expression. Together, our data reveal an undiscovered function of 5' UTR of MEV VP2 in regulating viral gene expression.IMPORTANCE MEV, a parvovirus, causes acute enteritis in mink. In the present report, we describe an untranslated sequence-dependent mechanism by which MEV regulates capsid gene expression. Our results highlight the roles of untranslated sequences in regulating the transcriptional activity of P38 promoter and translation of capsid genes. These data also reveal the possibility of an unusual translation mechanism in capsid protein expression and the multiple functions of nonstructural protein. A better understanding of the gene expression regulation mechanism of this virus will help in the design of new vaccines and targets for antiviral agents against MEV.
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