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Zhu M, Huang F, Sun H, Liu K, Chen Z, Yu B, Hao H, Liu H, Ding S, Zhang X, Liu L, Zhang K, Ren J, Liu Y, Liu H, Shan C, Guan W. Characterization of ACTN4 as a novel antiviral target against SARS-CoV-2. Signal Transduct Target Ther 2024; 9:243. [PMID: 39289355 PMCID: PMC11408661 DOI: 10.1038/s41392-024-01956-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Revised: 08/13/2024] [Accepted: 08/27/2024] [Indexed: 09/19/2024] Open
Abstract
The various mutations in severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pose a substantial challenge in mitigating the viral infectivity. The identification of novel host factors influencing SARS-CoV-2 replication holds potential for discovering new targets for broad-spectrum antiviral drugs that can combat future viral mutations. In this study, potential host factors regulated by SARS-CoV-2 infection were screened through different high-throughput sequencing techniques and further identified in cells. Subsequent analysis and experiments showed that the reduction of m6A modification level on ACTN4 (Alpha-actinin-4) mRNA leads to a decrease in mRNA stability and translation efficiency, ultimately inhibiting ACTN4 expression. In addition, ACTN4 was demonstrated to target nsp12 for binding and characterized as a competitor for SARS-CoV-2 RNA and the RNA-dependent RNA polymerase complex, thereby impeding viral replication. Furthermore, two ACTN4 agonists, YS-49 and demethyl-coclaurine, were found to dose-dependently inhibit SARS-CoV-2 infection in both Huh7 cells and K18-hACE2 transgenic mice. Collectively, this study unveils the pivotal role of ACTN4 in SARS-CoV-2 infection, offering novel insights into the intricate interplay between the virus and host cells, and reveals two potential candidates for future anti-SARS-CoV-2 drug development.
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Affiliation(s)
- Miao Zhu
- Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, Hubei, 430071, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Fang Huang
- Hubei Jiangxia Laboratory, Wuhan, Hubei, 430200, China
| | - Huize Sun
- Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, Hubei, 430071, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Kunpeng Liu
- Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, Hubei, 430071, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhen Chen
- Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, Hubei, 430071, China
| | - Baocheng Yu
- Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, Hubei, 430071, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Haojie Hao
- Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, Hubei, 430071, China
| | - Haizhou Liu
- Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, Hubei, 430071, China
| | - Shuang Ding
- Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, Hubei, 430071, China
| | - Xueyan Zhang
- Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, Hubei, 430071, China
| | - Lishi Liu
- Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, Hubei, 430071, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Kui Zhang
- Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, Hubei, 430071, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Jierao Ren
- Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, Hubei, 430071, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yi Liu
- Hubei Jiangxia Laboratory, Wuhan, Hubei, 430200, China
| | - Haibin Liu
- Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, Hubei, 430071, China
- Hubei Jiangxia Laboratory, Wuhan, Hubei, 430200, China
| | - Chao Shan
- Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, Hubei, 430071, China
- Hubei Jiangxia Laboratory, Wuhan, Hubei, 430200, China
| | - Wuxiang Guan
- Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, Hubei, 430071, China.
- Hubei Jiangxia Laboratory, Wuhan, Hubei, 430200, China.
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Laybourn HA, Hellemann Polhaus C, Kristensen C, Lyngfeldt Henriksen B, Zhang Y, Brogaard L, Larsen CA, Trebbien R, Larsen LE, Kalogeropoulos K, Auf dem Keller U, Skovgaard K. Multi-omics analysis reveals the impact of influenza a virus host adaptation on immune signatures in pig tracheal tissue. Front Immunol 2024; 15:1432743. [PMID: 39247193 PMCID: PMC11378526 DOI: 10.3389/fimmu.2024.1432743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2024] [Accepted: 07/29/2024] [Indexed: 09/10/2024] Open
Abstract
Introduction Influenza A virus (IAV) infection is a global respiratory disease, which annually leads to 3-5 million cases of severe illness, resulting in 290,000-650,000 deaths. Additionally, during the past century, four global IAV pandemics have claimed millions of human lives. The epithelial lining of the trachea plays a vital role during IAV infection, both as point of viral entry and replication as well as in the antiviral immune response. Tracheal tissue is generally inaccessible from human patients, which makes animal models crucial for the study of the tracheal host immune response. Method In this study, pigs were inoculated with swine- or human-adapted H1N1 IAV to gain insight into how host adaptation of IAV shapes the innate immune response during infection. In-depth multi-omics analysis (global proteomics and RNA sequencing) of the host response in upper and lower tracheal tissue was conducted, and results were validated by microfluidic qPCR. Additionally, a subset of samples was selected for histopathological examination. Results A classical innate antiviral immune response was induced in both upper and lower trachea after infection with either swine- or human-adapted IAV with upregulation of genes and higher abundance of proteins associated with viral infection and recognition, accompanied by a significant induction of interferon stimulated genes with corresponding higher proteins concentrations. Infection with the swine-adapted virus induced a much stronger immune response compared to infection with a human-adapted IAV strain in the lower trachea, which could be a consequence of a higher viral load and a higher degree of inflammation. Discussion Central components of the JAK-STAT pathway, apoptosis, pyrimidine metabolism, and the cytoskeleton were significantly altered depending on infection with swine- or human-adapted virus and might be relevant mechanisms in relation to antiviral immunity against putative zoonotic IAV. Based on our findings, we hypothesize that during host adaptation, IAV evolve to modulate important host cell elements to favor viral infectivity and replication.
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Affiliation(s)
- Helena Aagaard Laybourn
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Kongens Lyngby, Denmark
| | | | - Charlotte Kristensen
- Department of Veterinary and Animal Sciences, University of Copenhagen, Copenhagen, Denmark
| | | | - Yaolei Zhang
- Qingdao Key Laboratory of Marine Genomics, BGI-Qingdao, Qingdao, China
| | - Louise Brogaard
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Cathrine Agnete Larsen
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Ramona Trebbien
- Department of Virus and Microbiological Special Diagnostics, Statens Serum Institut, Copenhagen, Denmark
| | - Lars Erik Larsen
- Department of Veterinary and Animal Sciences, University of Copenhagen, Copenhagen, Denmark
| | | | - Ulrich Auf dem Keller
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Kerstin Skovgaard
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Kongens Lyngby, Denmark
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Kong X, Wang Q, Wang X, Yang K, Nie S, Li Y, Lao W, Yu X, Zhang Y, Li Z, Liu Y, Ning J, Wang Y, Bi C, Wu C, Zhai A. LINC01002 functions as a ceRNA to regulate FRMD8 by sponging miR-4324 for the development of COVID-19. Virol J 2024; 21:109. [PMID: 38734674 PMCID: PMC11088083 DOI: 10.1186/s12985-024-02382-2] [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: 11/28/2023] [Accepted: 05/03/2024] [Indexed: 05/13/2024] Open
Abstract
BACKGROUND Syndrome coronavirus-2 (SARS-CoV-2) has developed various strategies to evade the antiviral impact of type I IFN. Non-structural proteins and auxiliary proteins have been extensively researched on their role in immune escape. Nevertheless, the detailed mechanisms of structural protein-induced immune evasion have not been well elucidated. METHODS Human alveolar basal epithelial carcinoma cell line (A549) was stimulated with polyinosinic-polycytidylic acid (PIC) and independently transfected with four structural proteins expression plasmids, including nucleocapsid (N), spike (S), membrane (M) and envelope (E) proteins. By RT-qPCR and ELISA, the structural protein with the most pronounced inhibitory effects on IFN-β induction was screened. RNA-sequencing (RNA-Seq) and two differential analysis strategies were used to obtain differentially expressed genes associated with N protein inhibition of IFN-β induction. Based on DIANA-LncBase and StarBase databases, the interactive competitive endogenous RNA (ceRNA) network for N protein-associated genes was constructed. By combining single-cell sequencing data (GSE158055), lncRNA-miRNA-mRNA axis was further determined. Finally, RT-qPCR was utilized to illustrate the regulatory functions among components of the ceRNA axis. RESULTS SARS-CoV-2 N protein inhibited IFN-β induction in human alveolar epithelial cells most significantly compared with other structural proteins. RNA-Seq data analysis revealed genes related to N protein inhibiting IFNs induction. The obtained 858 differentially expressed genes formed the reliable ceRNA network. The function of LINC01002-miR-4324-FRMD8 axis in the IFN-dominated immune evasion was further demonstrated through integrating single-cell sequencing data. Moreover, we validated that N protein could reverse the effect of PIC on LINC01002, FRMD8 and miR-4324 expression, and subsequently on IFN-β expression level. And LINC01002 could regulate the production of FRMD8 by inhibiting miR-4324. CONCLUSION SARS-CoV-2 N protein suppressed the induction of IFN-β by regulating LINC01002 which was as a ceRNA, sponging miR-4324 and participating in the regulation of FRMD8 mRNA. Our discovery provides new insights into early intervention therapy and drug development on SARS-CoV-2 infection.
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Affiliation(s)
- Xinyi Kong
- Department of Laboratory Medicine, The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, China
| | - Qinjin Wang
- Department of Laboratory Medicine, The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, China
| | - Xumeng Wang
- Department of Laboratory Medicine, The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, China
- Department of Microbiology, Harbin Medical University, Harbin, 150081, China
| | - Kaming Yang
- Department of Endocrinology, The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, China
| | - Shuping Nie
- Department of Laboratory Medicine, The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, China
| | - Yuetong Li
- Department of Endocrinology, The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, China
| | - Wanwen Lao
- Department of Endocrinology, The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, China
| | - Xin Yu
- Department of Laboratory Medicine, The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, China
| | - Yanping Zhang
- Department of Laboratory Medicine, The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, China
| | - Zhenlin Li
- Department of Endocrinology, The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, China
| | - Yang Liu
- Department of Laboratory Medicine, The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, China
| | - Jie Ning
- Department of Laboratory Medicine, The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, China
| | - Yan Wang
- Department of Microbiology, Harbin Medical University, Harbin, 150081, China.
| | - Changlong Bi
- Department of Endocrinology, The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, China.
| | - Chao Wu
- Department of Laboratory Medicine, The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, China.
| | - Aixia Zhai
- Department of Laboratory Medicine, The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, China.
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4
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Kriger D, Novitskaya K, Vasileva G, Lomert E, Aksenov ND, Barlev NA, Tentler D. Alpha-actnin-4 (ACTN4) selectively affects the DNA double-strand breaks repair in non-small lung carcinoma cells. Biol Direct 2022; 17:40. [PMID: 36476259 PMCID: PMC9730676 DOI: 10.1186/s13062-022-00354-6] [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: 11/08/2022] [Accepted: 11/30/2022] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND ACTN4 is an actin-binding protein involved in many cellular processes, including cancer development. High ACTN4 expression is often associated with a poor prognosis. However, it has been identified as a positive marker for platinum-based adjuvant chemotherapy for non-small cell lung cancer (NSCLC). The goal of our study was to investigate the involvement of ACTN4 in the NSCLC cells' response to the genotoxic drugs. RESULTS We generated H1299 cells with the ACTN4 gene knock-out (ACTN4 KO), using the CRISPR/Cas9 system. The resistance of the cells to the cisplatin and etoposide was analyzed with the MTT assay. We were also able to estimate the efficiency of DNA repair through the DNA comet assay and gamma-H2AX staining. Possible ACTN4 effects on the non-homologous end joining (NHEJ) and homologous recombination (HR) were investigated using pathway-specific reporter plasmids and through the immunostaining of the key proteins. We found that the H1299 cells with the ACTN4 gene knock-out did not show cisplatin-resistance, but did display a higher resistance to the topoisomerase II inhibitors etoposide and doxorubicin, suggesting that ACTN4 might be somehow involved in the repair of DNA strand breaks. Indeed, the H1299 ACTN4 KO cells repaired etoposide- and doxorubicin-induced DNA breaks more effectively than the control cells. Moreover, the ACTN4 gene knock-out enhanced NHEJ and suppressed HR efficiency. Supporting the data, the depletion of ACTN4 resulted in the faster assembly of the 53BP1 foci with a lower number of the phospho-BRCA1 foci after the etoposide treatment. CONCLUSIONS Thus, we are the first to demonstrate that ACTN4 may influence the resistance of cancer cells to the topoisomerase II inhibitors, and affect the efficiency of the DNA double strand breaks repair. We hypothesize that ACTN4 interferes with the assembly of the NHEJ and HR complexes, and hence regulates balance between these DNA repair pathways.
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Affiliation(s)
- Daria Kriger
- grid.4886.20000 0001 2192 9124Institute of Cytology, Russian Academy of Sciences, Tikhoretsky Ave. 4, St Petersburg, Russian Federation 194064
| | - Ksenia Novitskaya
- grid.4886.20000 0001 2192 9124Institute of Cytology, Russian Academy of Sciences, Tikhoretsky Ave. 4, St Petersburg, Russian Federation 194064
| | - Giomar Vasileva
- grid.4886.20000 0001 2192 9124Institute of Cytology, Russian Academy of Sciences, Tikhoretsky Ave. 4, St Petersburg, Russian Federation 194064
| | - Ekaterina Lomert
- grid.4886.20000 0001 2192 9124Institute of Cytology, Russian Academy of Sciences, Tikhoretsky Ave. 4, St Petersburg, Russian Federation 194064
| | - Nikolai D. Aksenov
- grid.4886.20000 0001 2192 9124Institute of Cytology, Russian Academy of Sciences, Tikhoretsky Ave. 4, St Petersburg, Russian Federation 194064
| | - Nikolai A. Barlev
- grid.4886.20000 0001 2192 9124Institute of Cytology, Russian Academy of Sciences, Tikhoretsky Ave. 4, St Petersburg, Russian Federation 194064 ,grid.428191.70000 0004 0495 7803Nazarbayev University, 020000 Astana, Kazakhstan
| | - Dmitri Tentler
- grid.4886.20000 0001 2192 9124Institute of Cytology, Russian Academy of Sciences, Tikhoretsky Ave. 4, St Petersburg, Russian Federation 194064
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5
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Tang YS, So WK, Ng KLA, Mok KPC, Shaw PC. Interaction of Influenza A Nucleoprotein with Host hnRNP-C Is Implicated in Viral Replication. Int J Mol Sci 2022; 23:13613. [PMID: 36362400 PMCID: PMC9655074 DOI: 10.3390/ijms232113613] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 10/27/2022] [Accepted: 11/04/2022] [Indexed: 08/18/2023] Open
Abstract
The host interactome of influenza viral proteins is ever-expanding. In this work, we report the identification of host heterogeneous nuclear ribonucleoprotein C (hnRNP-C) as an interacting partner of influenza A virus nucleoprotein (NP). We confirmed that this interaction exists across different influenza A subtypes and strains. Using biochemical methods, we determined that hnRNP-C interacts with NP via its C-terminal auxiliary domain. Further, we determined that the hnRNP-C is a negative regulator of influenza viral growth. Its interaction with NP is implicated in the promotion of host cell apoptosis during viral infection. It is the first time that the interaction between influenza nucleoprotein and host heterogeneous nuclear ribonucleoprotein C is characterized in detail. Overall, these findings not only characterize the interaction between NP and its host interacting partner hnRNP-C but also clarify the functional significance of this interaction. This work may lead to a new therapeutic target for the development of anti-influenza drugs.
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Affiliation(s)
- Yun-Sang Tang
- Centre for Protein Sciences and Crystallography, School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Wai-Kin So
- Centre for Protein Sciences and Crystallography, School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Ka-Leung Andy Ng
- Office of University General Education, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Ka-Pun Chris Mok
- The Jockey Club School of Public Health and Primary Care, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China
- Li Ka Shing Institute of Health Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Pang-Chui Shaw
- Centre for Protein Sciences and Crystallography, School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Hong Kong SAR, China
- Li Dak Sum Yip Yio Chin R&D Centre for Chinese Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China
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ILDR1 promotes influenza A virus replication through binding to PLSCR1. Sci Rep 2022; 12:8515. [PMID: 35595813 PMCID: PMC9122930 DOI: 10.1038/s41598-022-12598-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Accepted: 05/05/2022] [Indexed: 12/13/2022] Open
Abstract
As a natural antiviral regulator, phospholipid scramblase 1 (PLSCR1) has been shown to inhibit influenza virus replication in infected cells through interacting with NP of influenza A virus (IAV). But its antiviral function as well as the underlying regulatory mechanism has not been examined in vivo. In the present work, we show that PLSCR1 expression is decreased in H1N1 SIV-infected mice, and Plscr1−/− mice are more susceptible to H1N1 SIV infection. By performing yeast two-hybrid screening, we identified immunoglobulin-like domain-containing receptor 1 (ILDR1) as a novel PLSCR1-binding partner. ILDR1 is highly expressed in the lungs, and its expression level is increased after virus infection. Interestingly, ILDR1 could not directly interact with virus NP protein, but could combine with PLSCR1 competitively. Our data indicates that there is a previously unidentified PLSCR1-ILDR1-NP regulatory pathway playing a vital role in limiting IAV infection, which provides novel insights into IAV-host interactions.
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Kaur R, Batra J, Stuchlik O, Reed MS, Pohl J, Sambhara S, Lal SK. Heterogeneous Ribonucleoprotein A1 (hnRNPA1) Interacts with the Nucleoprotein of the Influenza a Virus and Impedes Virus Replication. Viruses 2022; 14:v14020199. [PMID: 35215793 PMCID: PMC8880450 DOI: 10.3390/v14020199] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2021] [Revised: 01/16/2022] [Accepted: 01/17/2022] [Indexed: 12/13/2022] Open
Abstract
Influenza A virus (IAV), like other viruses, depends on the host cellular machinery for replication and production of progeny. The relationship between a virus and a host is complex, shaped by many spatial and temporal interactions between viral and host proteome, ultimately dictating disease outcome. Therefore, it is imperative to identify host-virus interactions as crucial determinants of disease pathogenies. Heterogeneous ribonucleoprotein A1 (hnRNPA1) is an RNA binding protein involved in the life cycle of many DNA and RNA viruses; however, its role in IAV remains undiscovered. Here we report that human hnRNPA1 physically interacts with the nucleoprotein (NP) of IAV in mammalian cells at different time points of the viral replication cycle. Temporal distribution studies identify hnRNPA1 and NP co-localize in the same cellular milieu in both nucleus and mitochondria in NP-transfected and IAV-infected mammalian cells. Interestingly, hnRNPA1 influenced NP gene expression and affected viral replication. Most importantly, hnRNPA1 knockdown caused a significant increase in NP expression and enhanced viral replication (93.82%) in IAV infected A549 cells. Conversely, hnRNPA1 overexpression reduced NP expression at the mRNA and protein levels and impeded virus replication by (60.70%), suggesting antagonistic function. Taken together, results from this study demonstrate that cellular hnRNPA1 plays a protective role in the host hitherto unknown and may hold potential as an antiviral target to develop host-based therapeutics against IAV.
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Affiliation(s)
- Ramandeep Kaur
- School of Science, Monash University, Selangor 47500, Malaysia; (R.K.); (J.B.)
| | - Jyoti Batra
- School of Science, Monash University, Selangor 47500, Malaysia; (R.K.); (J.B.)
| | - Olga Stuchlik
- Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA; (O.S.); (M.S.R.); (J.P.)
| | - Matthew S. Reed
- Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA; (O.S.); (M.S.R.); (J.P.)
| | - Jan Pohl
- Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA; (O.S.); (M.S.R.); (J.P.)
| | - Suryaprakash Sambhara
- Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA; (O.S.); (M.S.R.); (J.P.)
- Correspondence: (S.S.); (S.K.L.)
| | - Sunil Kumar Lal
- School of Science, Monash University, Selangor 47500, Malaysia; (R.K.); (J.B.)
- Tropical Medicine & Biology Platform, Monash University, Selangor 47500, Malaysia
- Correspondence: (S.S.); (S.K.L.)
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8
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Role of ARP2/3 Complex-Driven Actin Polymerization in RSV Infection. Pathogens 2021; 11:pathogens11010026. [PMID: 35055974 PMCID: PMC8781601 DOI: 10.3390/pathogens11010026] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 12/14/2021] [Accepted: 12/20/2021] [Indexed: 01/30/2023] Open
Abstract
Respiratory syncytial virus (RSV) is the leading viral agent causing bronchiolitis and pneumonia in children under five years old worldwide. The RSV infection cycle starts with macropinocytosis-based entry into the host airway epithelial cell membrane, followed by virus transcription, replication, assembly, budding, and spread. It is not surprising that the host actin cytoskeleton contributes to different stages of the RSV replication cycle. RSV modulates actin-related protein 2/3 (ARP2/3) complex-driven actin polymerization for a robust filopodia induction on the infected lung epithelial A549 cells, which contributes to the virus’s budding, and cell-to-cell spread. Thus, a comprehensive understanding of RSV-induced cytoskeletal modulation and its role in lung pathobiology may identify novel intervention strategies. This review will focus on the role of the ARP2/3 complex in RSV’s pathogenesis and possible therapeutic targets to the ARP2/3 complex for RSV.
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9
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Zeng Y, Wang R, Wang F, Zhang M, Zhang L, Zhu C, Zhao J, Liu H. Interaction of influenza A virus NS1 and cytoskeleton scaffolding protein α-actinin 4. Virus Genes 2021; 58:15-22. [PMID: 34727338 DOI: 10.1007/s11262-021-01876-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Accepted: 10/18/2021] [Indexed: 11/28/2022]
Abstract
NS1 (Non-structural protein 1) is a non-structural protein that can highly express when the avian influenza virus infects the host cells. NS1 can interact with various proteins to alter the intracellular distribution of host proteins and regulate the virulence and pathogenicity of the avian influenza virus. To further study the role of NS1 protein in replication and pathogenesis of avian influenza virus, Glutathione S-transferase (GST) Pull-down was used for screening more proteins interacting with NS1 in human lung adenocarcinoma cell line A549. By mass spectrometry, a potential interacted protein is identified as α-actinin 4 and its interaction with NS1 has not been reported yet. The interaction between NS1 and α-actinin 4 in vitro was confirmed by enzyme-linked immunosorbent assay experiments, and the results showed that the absorbance value of OD450nm in the experimental group was positively correlated with the concentration of NS1-GST protein compared to the negative control group. The co-immunoprecipitation and immunofluorescence results further confirmed the interaction between NS1 and α-actinin 4 at the cellular level. The interaction between NS1 and α-actinin 4 provided a new target for pathogenic mechanism studying and drug screening.
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Affiliation(s)
- Yingyue Zeng
- School of Life Sciences, Liaoning University, Shenyang, 110036, China.,Engineering Laboratory of Molecular Modeling and Design for Drug of Liaoning Province, Shenyang, 110036, China.,Research Center for Computer Simulating and Information Processing of Bio-Macromolecules of Liaoning, Shenyang, 110036, China.,Technology Innovation Center for Computer Simulating and Information Processing of Bio-Macromolecules of Shenyang, Shenyang, 110036, China
| | - Rui Wang
- School of Life Sciences, Liaoning University, Shenyang, 110036, China
| | - Fengchao Wang
- School of Life Sciences, Liaoning University, Shenyang, 110036, China
| | - Man Zhang
- School of Life Sciences, Liaoning University, Shenyang, 110036, China
| | - Li Zhang
- School of Life Sciences, Liaoning University, Shenyang, 110036, China.,Engineering Laboratory of Molecular Modeling and Design for Drug of Liaoning Province, Shenyang, 110036, China.,Research Center for Computer Simulating and Information Processing of Bio-Macromolecules of Liaoning, Shenyang, 110036, China.,Technology Innovation Center for Computer Simulating and Information Processing of Bio-Macromolecules of Shenyang, Shenyang, 110036, China
| | - Chunyu Zhu
- School of Life Sciences, Liaoning University, Shenyang, 110036, China.,Research Center for Computer Simulating and Information Processing of Bio-Macromolecules of Liaoning, Shenyang, 110036, China
| | - Jian Zhao
- School of Life Sciences, Liaoning University, Shenyang, 110036, China.,Engineering Laboratory of Molecular Modeling and Design for Drug of Liaoning Province, Shenyang, 110036, China.,Research Center for Computer Simulating and Information Processing of Bio-Macromolecules of Liaoning, Shenyang, 110036, China.,Technology Innovation Center for Computer Simulating and Information Processing of Bio-Macromolecules of Shenyang, Shenyang, 110036, China
| | - Hongsheng Liu
- School of Pharmacy, Liaoning University, Shenyang, 110036, China. .,Engineering Laboratory of Molecular Modeling and Design for Drug of Liaoning Province, Shenyang, 110036, China. .,Research Center for Computer Simulating and Information Processing of Bio-Macromolecules of Liaoning, Shenyang, 110036, China. .,Technology Innovation Center for Computer Simulating and Information Processing of Bio-Macromolecules of Shenyang, Shenyang, 110036, China.
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10
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Acetylation, Methylation and Allysine Modification Profile of Viral and Host Proteins during Influenza A Virus Infection. Viruses 2021; 13:v13071415. [PMID: 34372620 PMCID: PMC8310381 DOI: 10.3390/v13071415] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 07/08/2021] [Accepted: 07/18/2021] [Indexed: 12/18/2022] Open
Abstract
Protein modifications dynamically occur and regulate biological processes in all organisms. Towards understanding the significance of protein modifications in influenza virus infection, we performed a global mass spectrometry screen followed by bioinformatics analyses of acetylation, methylation and allysine modification in human lung epithelial cells in response to influenza A virus infection. We discovered 8 out of 10 major viral proteins and 245 out of 2280 host proteins detected to be differentially modified by three modifications in infected cells. Some of the identified proteins were modified on multiple amino acids residues and by more than one modification; the latter occurred either on different or same residues. Most of the modified residues in viral proteins were conserved across >40 subtypes of influenza A virus, and influenza B or C viruses and located on the protein surface. Importantly, many of those residues have already been determined to be critical for the influenza A virus. Similarly, many modified residues in host proteins were conserved across influenza A virus hosts like humans, birds, and pigs. Finally, host proteins undergoing the three modifications clustered in common functional networks of metabolic, cytoskeletal, and RNA processes, all of which are known to be exploited by the influenza A virus.
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11
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Dhanda AS, Yang D, Guttman JA. Localization of alpha-actinin-4 during infections by actin remodeling bacteria. Anat Rec (Hoboken) 2020; 304:1400-1419. [PMID: 33099893 DOI: 10.1002/ar.24548] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 08/13/2020] [Accepted: 09/12/2020] [Indexed: 11/12/2022]
Abstract
Bacterial pathogens cause disease by subverting the structure and function of their target host cells. Several foodborne agents such as Listeria monocytogenes (L. monocytogenes), Shigella flexneri (S. flexneri), Salmonella enterica serovar Typhimurium (S. Typhimurium) and enteropathogenic Escherichia coli (EPEC) manipulate the host actin cytoskeleton to cause diarrheal (and systemic) infections. During infections, these invasive and adherent pathogens hijack the actin filaments of their host cells and rearrange them into discrete actin-rich structures that promote bacterial adhesion (via pedestals), invasion (via membrane ruffles and endocytic cups), intracellular motility (via comet/rocket tails) and/or intercellular dissemination (via membrane protrusions and invaginations). We have previously shown that actin-rich structures generated by L. monocytogenes contain the host actin cross-linker α-actinin-4. Here we set out to examine α-actinin-4 during other key steps of the L. monocytogenes infectious cycle as well as characterize the subcellular distribution of α-actinin-4 during infections with other model actin-hijacking bacterial pathogens (S. flexneri, S. Typhimurium and EPEC). Although α-actinin-4 is absent at sites of initial L. monocytogenes invasion, we show that it is a new component of the membrane invaginations formed during secondary infections of neighboring host cells. Importantly, we reveal that α-actinin-4 also localizes to the major actin-rich structures generated during cell culture infections with S. flexneri (comet/rocket tails and membrane protrusions), S. Typhimurium (membrane ruffles) and EPEC (pedestals). Taken together, these findings suggest that α-actinin-4 is a host factor that is exploited by an assortment of actin-hijacking bacterial pathogens.
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Affiliation(s)
- Aaron S Dhanda
- Department of Biological Sciences, Centre for Cell Biology, Development, and Disease, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Diana Yang
- Department of Biological Sciences, Centre for Cell Biology, Development, and Disease, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Julian A Guttman
- Department of Biological Sciences, Centre for Cell Biology, Development, and Disease, Simon Fraser University, Burnaby, British Columbia, Canada
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12
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Sharma A, Batra J, Stuchlik O, Reed MS, Pohl J, Chow VTK, Sambhara S, Lal SK. Influenza A Virus Nucleoprotein Activates the JNK Stress-Signaling Pathway for Viral Replication by Sequestering Host Filamin A Protein. Front Microbiol 2020; 11:581867. [PMID: 33101257 PMCID: PMC7546217 DOI: 10.3389/fmicb.2020.581867] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 09/07/2020] [Indexed: 12/28/2022] Open
Abstract
Influenza A virus (IAV) poses a major threat to global public health and is known to employ various strategies to usurp the host machinery for survival. Due to its fast-evolving nature, IAVs tend to escape the effect of available drugs and vaccines thus, prompting the development of novel antiviral strategies. High-throughput mass spectrometric screen of host-IAV interacting partners revealed host Filamin A (FLNA), an actin-binding protein involved in regulating multiple signaling pathways, as an interaction partner of IAV nucleoprotein (NP). In this study, we found that the IAV NP interrupts host FLNA-TRAF2 interaction by interacting with FLNA thus, resulting in increased levels of free, displaced TRAF2 molecules available for TRAF2-ASK1 mediated JNK pathway activation, a pathway critical to maintaining efficient viral replication. In addition, siRNA-mediated FLNA silencing was found to promote IAV replication (87% increase) while FLNA-overexpression impaired IAV replication (65% decrease). IAV NP was observed to be a crucial viral factor required to attain FLNA mRNA and protein attenuation post-IAV infection for efficient viral replication. Our results reveal FLNA to be a host factor with antiviral potential hitherto unknown to be involved in the IAV replication cycle thus, opening new possibilities of FLNA-NP interaction as a candidate anti-influenza drug development target.
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Affiliation(s)
- Anshika Sharma
- School of Science, Monash University Malaysia, Subang Jaya, Malaysia
| | - Jyoti Batra
- School of Science, Monash University Malaysia, Subang Jaya, Malaysia
| | - Olga Stuchlik
- National Center for Emerging Zoonotic and Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States
| | - Matthew S Reed
- National Center for Emerging Zoonotic and Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States
| | - Jan Pohl
- National Center for Emerging Zoonotic and Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States
| | - Vincent T K Chow
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Suryaprakash Sambhara
- Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States
| | - Sunil K Lal
- School of Science, Monash University Malaysia, Subang Jaya, Malaysia.,Tropical Medicine and Biology Multidisciplinary Platform, Monash University Malaysia, Subang Jaya, Malaysia
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13
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Influenza A Virus: Host–Virus Relationships. Viruses 2020; 12:v12080870. [PMID: 32784813 PMCID: PMC7472137 DOI: 10.3390/v12080870] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2020] [Accepted: 08/04/2020] [Indexed: 11/16/2022] Open
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14
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Abstract
Background: Coronavirus disease (COVID-19) is an infectious disease discovered in 2019 and currently in outbreak across the world. Lung injury with severe respiratory failure is the leading cause of death in COVID-19, caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). However, there still lacks efficient treatment for COVID-19 induced lung injury and acute respiratory failure. Methods: Inhibition of angiotensin-converting enzyme 2 (ACE2) caused by the spike protein of SARS-CoV-2 is the most plausible mechanism of lung injury in COVID-19. We performed drug repositioning analysis to identify drug candidates that reverse gene expression pattern in L1000 lung cell line HCC515 treated with ACE2 inhibitor. We confirmed these drug candidates by similar bioinformatics analysis using lung tissues from patients deceased from COVID-19. We further investigated deregulated genes and pathways related to lung injury, as well as the gene-pathway-drug candidate relationships. Results: We propose two candidate drugs, COL-3 (a chemically modified tetracycline) and CGP-60474 (a cyclin-dependent kinase inhibitor), for treating lung injuries in COVID-19. Further bioinformatics analysis shows that 12 significantly enriched pathways (P-value <0.05) overlap between HCC515 cells treated with ACE2 inhibitor and human COVID-19 patient lung tissues. These include signaling pathways known to be associated with lung injury such as TNF signaling, MAPK signaling and chemokine signaling pathways. All 12 pathways are targeted in COL-3 treated HCC515 cells, in which genes such as RHOA, RAC2, FAS, CDC42 have reduced expression. CGP-60474 shares 11 of 12 pathways with COL-3 and common target genes such as RHOA. It also uniquely targets other genes related to lung injury, such as CALR and MMP14. Conclusions: This study shows that ACE2 inhibition is likely part of the mechanisms leading to lung injury in COVID-19, and that compounds such as COL-3 and CGP-60474 have potential as repurposed drugs for its treatment.
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Affiliation(s)
- Bing He
- Department of Computational Medicine and Bioinformatics, Medical School, University of Michigan, Ann Arbor, 48105, USA
| | - Lana Garmire
- Department of Computational Medicine and Bioinformatics, Medical School, University of Michigan, Ann Arbor, 48105, USA
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15
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Sharma S, Chatterjee A, Kumar P, Lal S, Kondabagil K. Upregulation of miR-101 during Influenza A Virus Infection Abrogates Viral Life Cycle by Targeting mTOR Pathway. Viruses 2020; 12:v12040444. [PMID: 32326380 PMCID: PMC7232138 DOI: 10.3390/v12040444] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 03/22/2020] [Accepted: 03/29/2020] [Indexed: 12/15/2022] Open
Abstract
Micro RNAs (miRNAs) are a class of small non-coding single-stranded RNA, which play an important role in modulating host-Influenza A virus (IAV) crosstalk. The interplay between influenza and miRNA interaction is defined by a plethora of complex mechanisms, which are not fully understood yet. Here, we demonstrate that in IAV infected A549 cells, a synchronous increase was observed in the expression of mTOR up to 24 hpi and significant downregulation at 48 hpi. Additionally, NP of IAV interacts with mTOR and modulates the levels of mTOR mRNA and protein, thus regulating the translation of host cell. RNA sequencing and qPCR analysis of IAV-infected A549 cells and NP transfected cells revealed that miR-101 downregulates mTOR transcripts at later stages of infection. Ectopic expression of miR-101 mimic led to a decrease in expression of NP, a reduction in IAV titer and replication. Moreover, treatment of the cells with Everolimus, a potent inhibitor of mTOR, resulted in an increase of miR-101 transcript levels, which further suppressed the viral protein synthesis. Collectively, the data suggest a novel mechanism that IAV stimulates mTOR pathway at early stages of infection; however, at a later time-point, positive regulation of miR-101 restrains the mTOR expression, and hence, the viral propagation.
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Affiliation(s)
- Shipra Sharma
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
- Correspondence: (S.S.); (S.L.); or (K.K.); Tel.: +91-(22)-25764766 (S.S.); +60-3-5514-6000 (S.L.); +91-(22)-25767758 (K.K.); Fax: +91-(22)-25723480 (S.S. & K.K.); +60-3-5514-6184 (S.L.)
| | - Anirvan Chatterjee
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Purnima Kumar
- Virology Group, International Centre for Genetic Engineering and Biotechnology, New Delhi 110067, India
| | - Sunil Lal
- School of Science, Monash University, Bandar Sunway 47500, Malaysia
- Correspondence: (S.S.); (S.L.); or (K.K.); Tel.: +91-(22)-25764766 (S.S.); +60-3-5514-6000 (S.L.); +91-(22)-25767758 (K.K.); Fax: +91-(22)-25723480 (S.S. & K.K.); +60-3-5514-6184 (S.L.)
| | - Kiran Kondabagil
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
- Correspondence: (S.S.); (S.L.); or (K.K.); Tel.: +91-(22)-25764766 (S.S.); +60-3-5514-6000 (S.L.); +91-(22)-25767758 (K.K.); Fax: +91-(22)-25723480 (S.S. & K.K.); +60-3-5514-6184 (S.L.)
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16
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Gaur P, Kumar P, Sharma A, Lal SK. AML1 protein interacts with influenza A virus neuraminidase and upregulates IFN-β response in infected mammalian cells. Lett Appl Microbiol 2020; 70:252-258. [PMID: 31990997 DOI: 10.1111/lam.13279] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Revised: 01/23/2020] [Accepted: 01/23/2020] [Indexed: 12/01/2022]
Abstract
Neuraminidase (NA) is an integral membrane protein of influenza A virus (IAV) and primarily aids in the release of progeny virions, following the intracellular viral replication cycle. In an attempt to discover new functions of NA, we conducted a classical yeast two-hybrid screen and found acute myeloid leukaemia marker 1 (AML1) as a novel interacting partner of IAV-NA. The interaction was further validated by co-immunoprecipitation in IAV-infected cells and in an in vitro coupled transcription/translation system. Interestingly, we found an increase in the expression of AML1 upon IAV infection in a dose-dependent manner. As expected, we also observed an increase in the IFN-β levels, the first line of defence against viral infections. Subsequently, when AML1 was downregulated using siRNA, the IFN-β levels were found to be remarkably reduced. Our study also shows that AML1 is induced upon IAV infection and results in the induction of IFN-β. Thus, AML1 is proposed to be an important player in IFN induction and has a role in an antiviral response against IAV infection. SIGNIFICANCE AND IMPACT OF THE STUDY: Influenza epidemics and pandemics are constant threats to human health. Development of antiviral therapeutics has focused on important and major IAV proteins as targets. However, the rate at which this virus mutates makes the task challenging. Thus, next-generation approaches aim at host cellular proteins that aid the virus in its replication. This study reports a new host-virus interaction, of acute myeloid leukaemia marker 1 (AML1) with influenza A neuraminidase (IAV-NA). We have found that this interaction has a direct effect on the upregulation of host IFN-β response. Further studies may lead to a greater understanding of this new innate defence pathway in infected cells.
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Affiliation(s)
- P Gaur
- School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - P Kumar
- Department of Biotechnology, Mewar University, Chittorgarh, Rajasthan, India.,Virology Group, International Centre for Genetic Engineering & Biotechnology, New Delhi, India
| | - A Sharma
- Department of Microbiology and Molecular Genetics, Faculty of Medicine, The Institute for Medical Research - Israel-Canada (IMRIC), The Hebrew University, Jerusalem, Israel
| | - S K Lal
- Department of Biotechnology, Mewar University, Chittorgarh, Rajasthan, India.,Virology Group, International Centre for Genetic Engineering & Biotechnology, New Delhi, India.,School of Science, Monash University Malaysia, Selangor DE, Malaysia
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17
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Tentler D, Lomert E, Novitskaya K, Barlev NA. Role of ACTN4 in Tumorigenesis, Metastasis, and EMT. Cells 2019; 8:cells8111427. [PMID: 31766144 PMCID: PMC6912194 DOI: 10.3390/cells8111427] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 11/08/2019] [Accepted: 11/10/2019] [Indexed: 12/11/2022] Open
Abstract
The actin-binding protein ACTN4 belongs to a family of actin-binding proteins and is a non-muscle alpha-actinin that has long been associated with cancer development. Numerous clinical studies showed that changes in ACTN4 gene expression are correlated with aggressiveness, invasion, and metastasis in certain tumors. Amplification of the 19q chromosomal region where the gene is located has also been reported. Experimental manipulations with ACTN4 expression further confirmed its involvement in cell proliferation, motility, and epithelial-mesenchymal transition (EMT). However, both clinical and experimental data suggest that the effects of ACTN4 up- or down-regulation may vary a lot between different types of tumors. Functional studies demonstrated its engagement in a number of cytoplasmic and nuclear processes, ranging from cytoskeleton reorganization to regulation of different signaling pathways. Such a variety of functions may be the reason behind cell type and cell line specific responses. Herein, we will review research progress and controversies regarding the prognostic and functional significance of ACTN4 for tumorigenesis.
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Affiliation(s)
- Dmitri Tentler
- Institute of Cytology, Russian Academy of Sciences, 4 Tikhoretsky ave., 194064 Saint Petersburg, Russia; (E.L.); (K.N.); (N.A.B.)
- Correspondence: or ; Tel.: +7-921-406-2058
| | - Ekaterina Lomert
- Institute of Cytology, Russian Academy of Sciences, 4 Tikhoretsky ave., 194064 Saint Petersburg, Russia; (E.L.); (K.N.); (N.A.B.)
| | - Ksenia Novitskaya
- Institute of Cytology, Russian Academy of Sciences, 4 Tikhoretsky ave., 194064 Saint Petersburg, Russia; (E.L.); (K.N.); (N.A.B.)
| | - Nikolai A. Barlev
- Institute of Cytology, Russian Academy of Sciences, 4 Tikhoretsky ave., 194064 Saint Petersburg, Russia; (E.L.); (K.N.); (N.A.B.)
- Moscow Institute of Physics and Technology, Dolgoprudny, 141701 Moscow, Russia
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18
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The actin cytoskeleton is important for rotavirus internalization and RNA genome replication. Virus Res 2019; 263:27-33. [PMID: 30639190 PMCID: PMC7173133 DOI: 10.1016/j.virusres.2019.01.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 12/13/2018] [Accepted: 01/08/2019] [Indexed: 02/06/2023]
Abstract
Different stages of the rotavirus lifecycle depend on the dynamics of the actin cytoskeleton. Alpha-actinin, Diaph, and the GTPase Cdc42 are important for virus entry. The GTPAse Rac1 is required for maximal viral RNA synthesis.
Numerous host factors are required for the efficient replication of rotavirus, including the activation and inactivation of several cell signaling pathways. One of the cellular structures that are reorganized during rotavirus infection is the actin cytoskeleton. In this work, we report that the dynamics of the actin microfilaments are important at different stages of the virus life cycle, specifically, during virus internalization and viral RNA synthesis at 6 h post-infection. Our results show that the actin-binding proteins alpha-actinin 4 and Diaph, as well as the Rho-family small GTPase Cdc42 are necessary for an efficient virus entry, while GTPase Rac1 is required for maximal viral RNA synthesis.
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19
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Ma G, Chen L, Luo J, Wang B, Wang C, Li M, Huang C, Du J, Ma J, Chang Y, He H. Histone acetyl transferase TIP60 inhibits the replication of influenza a virus by activation the TBK1-IRF3 pathway. Virol J 2018; 15:172. [PMID: 30409205 PMCID: PMC6225679 DOI: 10.1186/s12985-018-1079-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Accepted: 10/10/2018] [Indexed: 11/15/2022] Open
Abstract
Influenza A virus (IAV) is an important pathogen that poses a severe threat to the health of humans. Nucleoprotein (NP) of IAV plays crucial roles in the viral life cycle by interacting with various cellular factors. Histone Acetyl Transferase TIP60 is a key target of several viral proteins during infection, including HIV-1 Tat, HPV E6, HTLV-1 p30II and HCMV UL27 proteins. However, Whether the interaction between the IAV NP and TIP60, and the role of TIP60 in IAV life cycle are largely unknown. Here, we showed that IAV infection up-regulated TIP60 protein and RNA expression. Overexpression of TIP60 inhibited viral protein and RNA expression and reduced the progeny viral titer. Further study revealed that TIP60 inhibited viral replication through activation of TBK1-IRF3 signaling pathway. Furthermore, we demonstrated that the NP protein of IAV interacted with TIP60. Together, these results indicate that TIP60 play a repressor in IAV infection, and it may be a possible target for antiviral drugs.
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Affiliation(s)
- Guoyao Ma
- National Research Center for Wildlife Borne Diseases, Institute of Zoology, Chinese Academy of Sciences, No.1-5 Beichenxilu, Chaoyang District, Beijing, 100101, People's Republic of China.,University of the Chinese Academy of Sciences, Beijing, 100101, China
| | - Lin Chen
- National Research Center for Wildlife Borne Diseases, Institute of Zoology, Chinese Academy of Sciences, No.1-5 Beichenxilu, Chaoyang District, Beijing, 100101, People's Republic of China.,University of the Chinese Academy of Sciences, Beijing, 100101, China
| | - Jing Luo
- National Research Center for Wildlife Borne Diseases, Institute of Zoology, Chinese Academy of Sciences, No.1-5 Beichenxilu, Chaoyang District, Beijing, 100101, People's Republic of China
| | - Bo Wang
- National Research Center for Wildlife Borne Diseases, Institute of Zoology, Chinese Academy of Sciences, No.1-5 Beichenxilu, Chaoyang District, Beijing, 100101, People's Republic of China.,University of the Chinese Academy of Sciences, Beijing, 100101, China
| | - Chengmin Wang
- National Research Center for Wildlife Borne Diseases, Institute of Zoology, Chinese Academy of Sciences, No.1-5 Beichenxilu, Chaoyang District, Beijing, 100101, People's Republic of China
| | - Meng Li
- National Research Center for Wildlife Borne Diseases, Institute of Zoology, Chinese Academy of Sciences, No.1-5 Beichenxilu, Chaoyang District, Beijing, 100101, People's Republic of China.,University of the Chinese Academy of Sciences, Beijing, 100101, China
| | - Chengmei Huang
- National Research Center for Wildlife Borne Diseases, Institute of Zoology, Chinese Academy of Sciences, No.1-5 Beichenxilu, Chaoyang District, Beijing, 100101, People's Republic of China.,University of the Chinese Academy of Sciences, Beijing, 100101, China
| | - Juan Du
- National Research Center for Wildlife Borne Diseases, Institute of Zoology, Chinese Academy of Sciences, No.1-5 Beichenxilu, Chaoyang District, Beijing, 100101, People's Republic of China.,University of the Chinese Academy of Sciences, Beijing, 100101, China
| | - Jiajun Ma
- National Research Center for Wildlife Borne Diseases, Institute of Zoology, Chinese Academy of Sciences, No.1-5 Beichenxilu, Chaoyang District, Beijing, 100101, People's Republic of China.,University of the Chinese Academy of Sciences, Beijing, 100101, China
| | - Yungfu Chang
- Cornell University College of Veterinary Medicine, Ithaca, NY, 14853, USA
| | - Hongxuan He
- National Research Center for Wildlife Borne Diseases, Institute of Zoology, Chinese Academy of Sciences, No.1-5 Beichenxilu, Chaoyang District, Beijing, 100101, People's Republic of China.
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20
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Kumar P, Gaur P, Kumari R, Lal SK. Influenza A virus neuraminidase protein interacts with Hsp90, to stabilize itself and enhance cell survival. J Cell Biochem 2018; 120:6449-6458. [DOI: 10.1002/jcb.27935] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Accepted: 10/02/2018] [Indexed: 12/18/2022]
Affiliation(s)
- Purnima Kumar
- Department of Biotechnology, Mewar University Chittorgarh India
- Virology Group International Centre for Genetic Engineering and Biotechnology New Delhi India
| | - Pratibha Gaur
- Virology Group International Centre for Genetic Engineering and Biotechnology New Delhi India
- Research Group Model Systems for Infection Helmholtz Center for Infection Research Braunschweig Germany
| | - Rashmi Kumari
- Virology Group International Centre for Genetic Engineering and Biotechnology New Delhi India
| | - Sunil K Lal
- Department of Biotechnology, Mewar University Chittorgarh India
- Virology Group International Centre for Genetic Engineering and Biotechnology New Delhi India
- School of Science Monash University Bandar Sunway Malaysia
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21
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Lomert E, Turoverova L, Kriger D, Aksenov ND, Nikotina AD, Petukhov A, Mittenberg AG, Panyushev NV, Khotin M, Volkov K, Barlev NA, Tentler D. Co-expression of RelA/p65 and ACTN4 induces apoptosis in non-small lung carcinoma cells. Cell Cycle 2018; 17:616-626. [PMID: 29251177 DOI: 10.1080/15384101.2017.1417709] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Alpha-actinin 4 (ACTN4) is an actin-binding protein of the spectrin superfamily. ACTN4 is found both in the cytoplasm and nucleus of eukaryotic cells. The main function of cytoplasmic ACTN4 is stabilization of actin filaments and their binding to focal contacts. Nuclear ACTN4 takes part in the regulation of gene expression following by activation of certain transcription factors, but the mechanisms of regulation are not completely understood. Our previous studies have demonstrated the interaction of ACTN4 with the RelA/p65 subunit of NF-kappaB factor and the effect on its transcriptional activity in A431 and HEK293T cells. In the present work, we investigated changes in the composition of nuclear ACTN4-interacting proteins in non-small cell lung cancer cells H1299 upon stable RELA overexpression. We showed that ACTN4 was present in the nuclei of H1299 cells, regardless of the RELA expression level. The presence of ectopic RelA/p65 in H1299 cells increased the number of proteins interacting with nuclear ACTN4. Stable expression of RELA in these cells suppressed cell proliferation, which was further affected by simultaneous ACTN4 overexpression. We detected no significant effect on cell cycle but the apoptosis rate was increased in cells with a double RELA/ACTN4 overexpression. Interestingly, when expressed individually ACTN4 promoted proliferation of lung cancer cells. Furthermore, the bioinformatics analysis of gene expression in lung cancer patients suggested that overexpression of ACTN4 correlated with poor survival prognosis. We hypothesize that the effect of RELA on proliferation and apoptosis of H1299 cells can be mediated via affecting the interactome of ACTN4.
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Affiliation(s)
- Ekaterina Lomert
- a Institute of Cytology , Russian Academy of Sciences , Tikhoretsky av., 4, 194064 St. Petersburg , Russia
| | - Lidia Turoverova
- a Institute of Cytology , Russian Academy of Sciences , Tikhoretsky av., 4, 194064 St. Petersburg , Russia
| | - Daria Kriger
- a Institute of Cytology , Russian Academy of Sciences , Tikhoretsky av., 4, 194064 St. Petersburg , Russia
| | - Nikolai D Aksenov
- a Institute of Cytology , Russian Academy of Sciences , Tikhoretsky av., 4, 194064 St. Petersburg , Russia
| | - Alina D Nikotina
- a Institute of Cytology , Russian Academy of Sciences , Tikhoretsky av., 4, 194064 St. Petersburg , Russia
| | - Alexey Petukhov
- a Institute of Cytology , Russian Academy of Sciences , Tikhoretsky av., 4, 194064 St. Petersburg , Russia.,b Almazov National Medical Research Centre , Institute of Hematology , Russia, 2 Akkuratova street, 197341 St. Petersburg , Russia
| | - Alexey G Mittenberg
- a Institute of Cytology , Russian Academy of Sciences , Tikhoretsky av., 4, 194064 St. Petersburg , Russia
| | - Nikolai V Panyushev
- a Institute of Cytology , Russian Academy of Sciences , Tikhoretsky av., 4, 194064 St. Petersburg , Russia
| | - Mikhail Khotin
- a Institute of Cytology , Russian Academy of Sciences , Tikhoretsky av., 4, 194064 St. Petersburg , Russia
| | - Kirill Volkov
- c Research Resource Center «Molecular and cell technologies» , St. Petersburg State University , St. Petersburg , Russia
| | - Nikolai A Barlev
- a Institute of Cytology , Russian Academy of Sciences , Tikhoretsky av., 4, 194064 St. Petersburg , Russia
| | - Dmitri Tentler
- a Institute of Cytology , Russian Academy of Sciences , Tikhoretsky av., 4, 194064 St. Petersburg , Russia
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Luo W, Zhang J, Liang L, Wang G, Li Q, Zhu P, Zhou Y, Li J, Zhao Y, Sun N, Huang S, Zhou C, Chang Y, Cui P, Chen P, Jiang Y, Deng G, Bu Z, Li C, Jiang L, Chen H. Phospholipid scramblase 1 interacts with influenza A virus NP, impairing its nuclear import and thereby suppressing virus replication. PLoS Pathog 2018; 14:e1006851. [PMID: 29352288 PMCID: PMC5792031 DOI: 10.1371/journal.ppat.1006851] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Revised: 01/31/2018] [Accepted: 01/03/2018] [Indexed: 12/21/2022] Open
Abstract
Transcription and replication of the influenza A virus (IAV) genome occur in the nucleus of infected cells and are carried out by the viral ribonucleoprotein complex (vRNP). As a major component of the vRNP complex, the viral nucleoprotein (NP) mediates the nuclear import of the vRNP complex via its nuclear localization signals (NLSs). Clearly, an effective way for the host to antagonize IAV infection would be by targeting vRNP nuclear import. Here, we identified phospholipid scramblase 1 (PLSCR1) as a binding partner of NP by using a yeast two-hybrid (Y2H) screen. The interaction between NP and PLSCR1 in mammalian cells was demonstrated by using co-immunoprecipitation and pull-down assays. We found that the stable overexpression of PLSCR1 suppressed the nuclear import of NP, hindered the virus life cycle, and significantly inhibited the replication of various influenza subtypes. In contrast, siRNA knockdown or CRISPR/Cas9 knockout of PLSCR1 increased virus propagation. Further analysis indicated that the inhibitory effect of PLSCR1 on the nuclear import of NP was not caused by affecting the phosphorylation status of NP or by stimulating the interferon (IFN) pathways. Instead, PLSCR1 was found to form a trimeric complex with NP and members of the importin α family, which inhibited the incorporation of importin β, a key mediator of the classical nuclear import pathway, into the complex, thus impairing the nuclear import of NP and suppressing virus replication. Our results demonstrate that PLSCR1 negatively regulates virus replication by interacting with NP in the cytoplasm and preventing its nuclear import.
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Affiliation(s)
- Weiyu Luo
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Jie Zhang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Libin Liang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Guangwen Wang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Qibing Li
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Pengyang Zhu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Yuan Zhou
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Junping Li
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Yuhui Zhao
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Nan Sun
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Shanyu Huang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Chenchen Zhou
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Yu Chang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Pengfei Cui
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Pucheng Chen
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Yongping Jiang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Guohua Deng
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Zhigao Bu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Chengjun Li
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Li Jiang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Hualan Chen
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
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Goody M, Jurczyszak D, Kim C, Henry C. Influenza A Virus Infection Damages Zebrafish Skeletal Muscle and Exacerbates Disease in Zebrafish Modeling Duchenne Muscular Dystrophy. PLOS CURRENTS 2017; 9. [PMID: 29188128 PMCID: PMC5693338 DOI: 10.1371/currents.md.8a7e35c50fa2b48156799d3c39788175] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
INTRODUCTION Both genetic and infectious diseases can result in skeletal muscle degeneration, inflammation, pain, and/or weakness. Duchenne muscular dystrophy (DMD) is the most common congenital muscle disease. DMD causes progressive muscle wasting due to mutations in Dystrophin. Influenza A and B viruses are frequently associated with muscle complications, especially in children. Infections activate an immune response and immunosuppressant drugs reduce DMD symptoms. These data suggest that the immune system may contribute to muscle pathology. However, roles of the immune response in DMD and Influenza muscle complications are not well understood. Zebrafish with dmd mutations are a well-characterized model in which to study the molecular and cellular mechanisms of DMD pathology. We recently showed that zebrafish can be infected by human Influenza A virus (IAV). Thus, the zebrafish is a powerful system with which to ask questions about the etiology and mechanisms of muscle damage due to genetic and/or infectious diseases. METHODS We infected zebrafish with IAV and assayed muscle tissue structure, sarcolemma integrity, cell-extracellular matrix (ECM) attachment, and molecular and cellular markers of inflammation in response to IAV infection alone or in the context of DMD. RESULTS We find that IAV-infected zebrafish display mild muscle degeneration with sarcolemma damage and compromised ECM adhesion. An innate immune response is elicited in muscle in IAV-infected zebrafish: NFkB signaling is activated, pro-inflammatory cytokine expression is upregulated, and neutrophils localize to sites of muscle damage. IAV-infected dmd mutants display more severe muscle damage than would be expected from an additive effect of dmd mutation and IAV infection, suggesting that muscle damage caused by Dystrophin-deficiency and IAV infection is synergistic. DISCUSSION These data demonstrate the importance of preventing IAV infections in individuals with genetic muscle diseases. Elucidating the mechanisms of immune-mediated muscle damage will not only apply to DMD and IAV, but also to other conditions where the immune system, inflammation, and muscle tissue are known to be affected, such as autoimmune diseases, cancer, and aging.
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Affiliation(s)
| | - Denise Jurczyszak
- Department of Molecular and Biomedical Sciences, University of Maine, Orono, ME 04469, USA
| | | | - Clarissa Henry
- Graduate School for Biomedical Sciences and Engineering, School of Biology and Ecology, University of Maine. Orono, Main, USA
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Diosa-Toro M, Echavarría-Consuegra L, Flipse J, Fernández GJ, Kluiver J, van den Berg A, Urcuqui-Inchima S, Smit JM. MicroRNA profiling of human primary macrophages exposed to dengue virus identifies miRNA-3614-5p as antiviral and regulator of ADAR1 expression. PLoS Negl Trop Dis 2017; 11:e0005981. [PMID: 29045406 PMCID: PMC5662241 DOI: 10.1371/journal.pntd.0005981] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Revised: 10/30/2017] [Accepted: 09/20/2017] [Indexed: 01/18/2023] Open
Abstract
Background Due to the high burden of dengue disease worldwide, a better understanding of the interactions between dengue virus (DENV) and its human host cells is of the utmost importance. Although microRNAs modulate the outcome of several viral infections, their contribution to DENV replication is poorly understood. Methods and principal findings We investigated the microRNA expression profile of primary human macrophages challenged with DENV and deciphered the contribution of microRNAs to infection. To this end, human primary macrophages were challenged with GFP-expressing DENV and sorted to differentiate between truly infected cells (DENV-positive) and DENV-exposed but non-infected cells (DENV-negative cells). The miRNAome was determined by small RNA-Seq analysis and the effect of differentially expressed microRNAs on DENV yield was examined. Five microRNAs were differentially expressed in human macrophages challenged with DENV. Of these, miR-3614-5p was found upregulated in DENV-negative cells and its overexpression reduced DENV infectivity. The cellular targets of miR-3614-5p were identified by liquid chromatography/mass spectrometry and western blot. Adenosine deaminase acting on RNA 1 (ADAR1) was identified as one of the targets of miR-3614-5p and was shown to promote DENV infectivity at early time points post-infection. Conclusion/Significance Overall, miRNAs appear to play a limited role in DENV replication in primary human macrophages. The miRNAs that were found upregulated in DENV-infected cells did not control the production of infectious virus particles. On the other hand, miR-3614-5p, which was upregulated in DENV-negative macrophages, reduced DENV infectivity and regulated ADAR1 expression, a protein that facilitates viral replication. Dengue is the most common mosquito-borne disease worldwide and it is an increasing global concern for public health as its etiological agent, dengue virus (DENV), keeps spreading around the globe. Currently there are no specific antiviral therapies available to treat the disease. Macrophages are important target cells during natural DENV infection of humans. Here, we unraveled the importance of miRNAs in DENV replication in human primary macrophages. The expression profile of miRNAs was determined in truly DENV-infected cells and cells that were exposed but not productively infected by the virus by RNA sequencing. We revealed that only five miRNAs are regulated in primary macrophages challenged with DENV. These results show that miRNAs do not play a major role in DENV replication. Unexpectedly, we did identify a miRNA with moderate yet significant antiviral properties to DENV. Moreover, miRNA-3614-5p was found to not only decrease DENV but also West Nile virus infectivity. Mass spectrometry and bioinformatics analysis identified adenosine deaminase acting on RNA 1 (ADAR1) as one of the targets. Moreover, ADAR1 was observed to promote the early stages of DENV replication. Collectively, our study broadens the knowledge of the contribution of human miRNAs in shaping the network of interactions between DENV and its human host cells.
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Affiliation(s)
- Mayra Diosa-Toro
- Department of Medical Microbiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
- Grupo Inmunovirología, Facultad de Medicina, Universidad de Antioquia UdeA, Medellín, Colombia
| | - Liliana Echavarría-Consuegra
- Department of Medical Microbiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Jacky Flipse
- Department of Medical Microbiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | | | - Joost Kluiver
- Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Anke van den Berg
- Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Silvio Urcuqui-Inchima
- Grupo Inmunovirología, Facultad de Medicina, Universidad de Antioquia UdeA, Medellín, Colombia
| | - Jolanda M. Smit
- Department of Medical Microbiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
- * E-mail:
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Abstract
Influenza A virus (IAV) RNA segments are individually packaged with viral nucleoprotein (NP) and RNA polymerases to form a viral ribonucleoprotein (vRNP) complex. We previously reported that NP is a monoubiquitinated protein which can be deubiquitinated by a cellular ubiquitin protease, USP11. In this study, we identified an E3 ubiquitin ligase, CNOT4 (Ccr4-Not transcription complex subunit 4), which can ubiquitinate NP. We found that the levels of viral RNA, protein, viral particles, and RNA polymerase activity in CNOT4 knockdown cells were lower than those in the control cells upon IAV infection. Conversely, overexpression of CNOT4 rescued viral RNP activity. In addition, CNOT4 interacted with the NP in the cell. An in vitro ubiquitination assay also showed that NP could be ubiquitinated by in vitro-translated CNOT4, but ubiquitination did not affect the protein stability of NP. Significantly, CNOT4 increased NP ubiquitination, whereas USP11 decreased it. Mass spectrometry analysis of ubiquitinated NP revealed multiple ubiquitination sites on the various lysine residues of NP. Three of these, K184, K227, and K273, are located on the RNA-binding groove of NP. Mutations of these sites to arginine reduced viral RNA replication. These results indicate that CNOT4 is a ubiquitin ligase of NP, and ubiquitination of NP plays a positive role in viral RNA replication. Influenza virus, particularly influenza A virus, causes severe and frequent outbreaks among human and avian species. Finding potential target sites for antiviral agents is of utmost importance from the public health point of view. We previously found that viral nucleoprotein (NP) is ubiquitinated, and ubiquitination enhances viral RNA replication. In this study, we found a cellular ubiquitin ligase, CNOT4, capable of ubiquitinating NP. The ubiquitination sites are scattered on the surface of the NP molecule, which is critical for RNA replication. CNOT4 and a ubiquitin protease, USP11, together regulate the extent of NP ubiquitination and thereby the efficiency of RNA replication. This study thus identifies a potential antiviral target site and reveals a novel posttranslational mechanism for regulating viral replication. This represents a novel finding in the literature of influenza virus research.
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Yang S, Pei Y, Zhao A. iTRAQ-based Proteomic Analysis of Porcine Kidney Epithelial PK15 cells Infected with Pseudorabies virus. Sci Rep 2017; 7:45922. [PMID: 28374783 PMCID: PMC5379687 DOI: 10.1038/srep45922] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 03/03/2017] [Indexed: 12/18/2022] Open
Abstract
Pseudorabies virus (PRV) is one of the most important pathogens of swine, resulting in severe economic losses to the pig industry. To improve our understanding of the host responses to PRV infection, we applied isobaric tags for relative and absolute quantification (iTRAQ) labeling coupled with liquid chromatography-tandem mass spectrometry to quantitatively identify the differentially expressed cellular proteins in PRV-infected PK15 cells. In total, relative quantitative data were identified for 4333 proteins in PRV and mock- infected PK15 cells, among which 466 cellular proteins were differentially expressed, including 234 upregulated proteins and 232 downregulated proteins. Bioinformatics analysis disclosed that most of these differentially expressed proteins were involved in metabolic processes, cellular growth and proliferation, endoplasmic reticulum (ER) stress response, cell adhesion and cytoskeleton. Moreover, expression levels of four representative proteins, beta-catenin, STAT1, GRB2 and PCNA, were further confirmed by western blot analysis. This is the first attempt to analyze the protein profile of PRV-infected PK15 cells using iTRAQ technology, and our findings may provide valuable information to help understand the host response to PRV infection.
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Affiliation(s)
- Songbai Yang
- College of Animal Science and Technology, Zhejiang A&F University, Lin'an, Zhejiang 311300, China
| | - Yue Pei
- College of Animal Science and Technology, Zhejiang A&F University, Lin'an, Zhejiang 311300, China
| | - Ayong Zhao
- College of Animal Science and Technology, Zhejiang A&F University, Lin'an, Zhejiang 311300, China
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Höfer CT, Jolmes F, Haralampiev I, Veit M, Herrmann A. Influenza A virus nucleoprotein targets subnuclear structures. Cell Microbiol 2016; 19. [PMID: 27696627 DOI: 10.1111/cmi.12679] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Revised: 09/20/2016] [Accepted: 09/30/2016] [Indexed: 02/01/2023]
Abstract
The Influenza A virus nucleoprotein (NP) is the major protein component of the genomic viral ribonucleoprotein (vRNP) complexes, which are the replication- and transcription-competent units of Influenza viruses. Early during infection, NP mediates import of vRNPs into the host cell nucleus where viral replication and transcription take place; also newly synthesized NP molecules are targeted into the nucleus, enabling coreplicational assembly of progeny vRNPs. NP reportedly acts as regulatory factor during infection, and it is known to be involved in numerous interactions with host cell proteins. Yet, the NP-host cell interplay is still poorly understood. Here, we report that NP significantly interacts with the nuclear compartment and displays distinct affinities for different subnuclear structures. NP subnuclear behavior was studied by expression of fluorescent NP fusion proteins - including obligate monomeric NP - and site-specific fluorescence photoactivation measurements. We found that NP constructs accumulate in subnuclear domains frequently found adjacent to or overlapping with promyelocytic leukemia bodies and Cajal bodies. Targeting of NP to Cajal bodies could further be demonstrated in the context of virus infection. We hypothesize that by targeting functional nuclear organization, NP might either link viral replication to specific cellular machinery or interfere with host cell processes.
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Affiliation(s)
- Chris T Höfer
- IRI Life Sciences, Department of Biology, Molecular Biophysics, Humboldt-Universität zu Berlin, Berlin, Germany.,Department of Veterinary Medicine, Institute of Virology, Freie Universität Berlin, Berlin, Germany
| | - Fabian Jolmes
- IRI Life Sciences, Department of Biology, Molecular Biophysics, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Ivan Haralampiev
- IRI Life Sciences, Department of Biology, Molecular Biophysics, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Michael Veit
- Department of Veterinary Medicine, Institute of Virology, Freie Universität Berlin, Berlin, Germany
| | - Andreas Herrmann
- IRI Life Sciences, Department of Biology, Molecular Biophysics, Humboldt-Universität zu Berlin, Berlin, Germany
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28
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Kumar D, Broor S, Rajala MS. Interaction of Host Nucleolin with Influenza A Virus Nucleoprotein in the Early Phase of Infection Limits the Late Viral Gene Expression. PLoS One 2016; 11:e0164146. [PMID: 27711134 PMCID: PMC5053498 DOI: 10.1371/journal.pone.0164146] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2016] [Accepted: 09/20/2016] [Indexed: 12/17/2022] Open
Abstract
Influenza A virus nucleoprotein, is a multifunctional RNA-binding protein, encoded by segment-5 of the negative sense RNA genome. It serves as a key connector between the virus and the host during virus replication. It continuously shuttles between the cytoplasm and the nucleus interacting with various host cellular factors. In the current study, host proteins interacting with nucleoprotein of Influenza A virus of H1N1 2009 pandemic strain were identified by co-immunoprecipitation studies followed by MALDI-TOF/MS analysis. Here we report the host nucleolin, a major RNA-binding protein of the nucleolus as a novel interacting partner to influenza A virus nucleoprotein. We thus, explored the implications of this interaction in virus life cycle and our studies have shown that these two proteins interact early during infection in the cytoplasm of infected cells. Depletion of nucleolin in A549 cells by siRNA targeting endogenous nucleolin followed by influenza A virus infection, disrupted its interaction with viral nucleoprotein, resulting in increased expression of gene transcripts encoding late viral proteins; matrix (M1) and hemagglutinin (HA) in infected cells. On the contrary, over expression of nucleolin in cells transiently transfected with pEGFP-NCL construct followed by virus infection significantly reduced the late viral gene transcripts, and consequently the viral titer. Altered expression of late viral genes and titers following manipulation of host cellular nucleolin, proposes the functional importance of its interaction with nucleoprotein during influenza A virus infection.
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MESH Headings
- Animals
- Cell Line, Tumor
- Dogs
- Gene Expression Regulation, Viral
- Humans
- Influenza A Virus, H1N1 Subtype/genetics
- Influenza A Virus, H1N1 Subtype/metabolism
- Influenza A Virus, H1N1 Subtype/physiology
- Influenza, Human/epidemiology
- Influenza, Human/metabolism
- Influenza, Human/virology
- Madin Darby Canine Kidney Cells
- Nucleocapsid Proteins
- Pandemics
- Phosphoproteins/deficiency
- Phosphoproteins/genetics
- Phosphoproteins/metabolism
- Protein Binding
- RNA Interference
- RNA, Small Interfering/genetics
- RNA-Binding Proteins/genetics
- RNA-Binding Proteins/metabolism
- Seasons
- Transcription, Genetic
- Viral Core Proteins/genetics
- Viral Core Proteins/metabolism
- Nucleolin
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Affiliation(s)
- Deepshikha Kumar
- School of Biotechnology, Jawaharlal Nehru University, New Delhi, India
| | - Shobha Broor
- Department of Microbiology, Faculty of Medicine and Health Science, Shree Guru Gobind Singh Tricentenary University, Gurgaon, Haryana, India
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29
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Qu H, Li J, Yang L, Sun L, Liu W, He H. Influenza A Virus-induced expression of ISG20 inhibits viral replication by interacting with nucleoprotein. Virus Genes 2016; 52:759-767. [PMID: 27342813 DOI: 10.1007/s11262-016-1366-2] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Accepted: 06/18/2016] [Indexed: 11/25/2022]
Abstract
Influenza A virus (IAV) is an important pathogen that has a wide range of hosts and represents a threat to the health of humans and several animal species. IAV infection can induce the transcription of many genes in the host. In the present study, we demonstrated for the first time that three different strains of H1N1 IAV induce the expression of an IFN-stimulated gene, ISG20. We determined the antiviral activity of ISG20 against IAV because ISG20 inhibited viral protein expression and reduced the progeny viral titer dependent upon its exonuclease activity. To elucidate the detailed mechanism of ISG20, we further demonstrated that ISG20 impairs the polymerase activity and inhibits both the replication and transcription levels of the M1 and NP genes. Notably, we identified that ISG20 colocalizes and interacts with NP during IAV infection, while exonuclease-inactive mutant ISG20 lacked association with NP, indicating that ISG20 inhibits IAV replication by interacting with NP. Together, these data provide a detailed explanation for the specific antiviral action of ISG20 and suggest that ISG20 may act as a promising antiviral drug candidate against IAV.
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Affiliation(s)
- Hongren Qu
- National Research Center for Wildlife-Borne Diseases, Institute of Zoology, Chinese Academy of Sciences, 100101, Beijing, China
| | - Jing Li
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, 100101, Beijing, China
| | - Limin Yang
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, 100101, Beijing, China
| | - Lei Sun
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, 100101, Beijing, China
| | - Wenjun Liu
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, 100101, Beijing, China.
| | - Hongxuan He
- National Research Center for Wildlife-Borne Diseases, Institute of Zoology, Chinese Academy of Sciences, 100101, Beijing, China.
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30
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Human Heat shock protein 40 (Hsp40/DnaJB1) promotes influenza A virus replication by assisting nuclear import of viral ribonucleoproteins. Sci Rep 2016; 6:19063. [PMID: 26750153 PMCID: PMC4707480 DOI: 10.1038/srep19063] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Accepted: 10/26/2015] [Indexed: 01/11/2023] Open
Abstract
A unique feature of influenza A virus (IAV) life cycle is replication of the viral genome in the host cell nucleus. The nuclear import of IAV genome is an indispensable step in establishing virus infection. IAV nucleoprotein (NP) is known to mediate the nuclear import of viral genome via its nuclear localization signals. Here, we demonstrate that cellular heat shock protein 40 (Hsp40/DnaJB1) facilitates the nuclear import of incoming IAV viral ribonucleoproteins (vRNPs) and is important for efficient IAV replication. Hsp40 was found to interact with NP component of IAV RNPs during early stages of infection. This interaction is mediated by the J domain of Hsp40 and N-terminal region of NP. Drug or RNAi mediated inhibition of Hsp40 resulted in reduced nuclear import of IAV RNPs, diminished viral polymerase function and attenuates overall viral replication. Hsp40 was also found to be required for efficient association between NP and importin alpha, which is crucial for IAV RNP nuclear translocation. These studies demonstrate an important role for cellular chaperone Hsp40/DnaJB1 in influenza A virus life cycle by assisting nuclear trafficking of viral ribonucleoproteins.
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31
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Mayank AK, Sharma S, Nailwal H, Lal SK. Nucleoprotein of influenza A virus negatively impacts antiapoptotic protein API5 to enhance E2F1-dependent apoptosis and virus replication. Cell Death Dis 2015; 6:e2018. [PMID: 26673663 PMCID: PMC4720893 DOI: 10.1038/cddis.2015.360] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Revised: 11/03/2015] [Accepted: 11/05/2015] [Indexed: 12/02/2022]
Abstract
Apoptosis of host cells profoundly influences virus propagation and dissemination, events that are integral to influenza A virus (IAV) pathogenesis. The trigger for activation of apoptosis is regulated by an intricate interplay between cellular and viral proteins, with a strong bearing on IAV replication. Though the knowledge of viral proteins and mechanisms employed by IAV to induce apoptosis has advanced considerably of late, we know relatively little about the repertoire of host factors targeted by viral proteins. Thus, identification of cellular proteins that are hijacked by the virus will help us not only to understand the molecular underpinnings of IAV-induced apoptosis, but also to design future antiviral therapies. Here we show that the nucleoprotein (NP) of IAV directly interacts with and suppresses the expression of API5, a host antiapoptotic protein that antagonizes E2F1-dependent apoptosis. siRNA-mediated depletion of API5, in NP-overexpressed as well as IAV-infected cells, leads to upregulation of apoptotic protease activating factor 1 (APAF1), a downstream modulator of E2F1-mediated apoptosis, and cleavage of caspases 9 and 3, although a reciprocal pattern of these events was observed on ectopic overexpression of API5. In concordance with these observations, annexin V and 7AAD staining assays exhibit downregulation of early and late apoptosis in IAV-infected or NP-transfected cells on overexpression of API5. Most significantly, while overexpression of API5 decreases viral titers, cellular NP protein as well as mRNA levels in IAV-infected A549 cells, silencing of API5 expression causes a steep rise in the same parameters. From the data reported in this manuscript, we propose a proapoptotic role for NP in IAV pathogenesis, whereby it suppresses expression of antiapoptotic factor API5, thus potentiating the E2F1-dependent apoptotic pathway and ensuring viral replication.
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Affiliation(s)
- A K Mayank
- Virology Group, International Centre for Genetic Engineering & Biotechnology, Aruna Asaf Ali Road, New Delhi 110067, India
| | - S Sharma
- Virology Group, International Centre for Genetic Engineering & Biotechnology, Aruna Asaf Ali Road, New Delhi 110067, India
| | - H Nailwal
- School of Science, Monash University, Bandar Sunway, Petaling Jaya, Selangor DE 47500, Malaysia
| | - S K Lal
- School of Science, Monash University, Bandar Sunway, Petaling Jaya, Selangor DE 47500, Malaysia
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32
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Proteomics Analysis of Cellular Proteins Co-Immunoprecipitated with Nucleoprotein of Influenza A Virus (H7N9). Int J Mol Sci 2015; 16:25982-98. [PMID: 26528969 PMCID: PMC4661793 DOI: 10.3390/ijms161125934] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Revised: 10/13/2015] [Accepted: 10/22/2015] [Indexed: 01/18/2023] Open
Abstract
Avian influenza A viruses are serious veterinary pathogens that normally circulate among avian populations, causing substantial economic impacts. Some strains of avian influenza A viruses, such as H5N1, H9N2, and recently reported H7N9, have been occasionally found to adapt to humans from other species. In order to replicate efficiently in the new host, influenza viruses have to interact with a variety of host factors. In the present study, H7N9 nucleoprotein was transfected into human HEK293T cells, followed by immunoprecipitated and analyzed by proteomics approaches. A series of host proteins co-immunoprecipitated were identified with high confidence, some of which were found to be acetylated at their lysine residues. Bioinformatics analysis revealed that spliceosome might be the most relevant pathway involved in host response to nucleoprotein expression, increasing our emerging knowledge of host proteins that might be involved in influenza virus replication activities.
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Nailwal H, Sharma S, Mayank AK, Lal SK. The nucleoprotein of influenza A virus induces p53 signaling and apoptosis via attenuation of host ubiquitin ligase RNF43. Cell Death Dis 2015; 6:e1768. [PMID: 25996295 PMCID: PMC4669709 DOI: 10.1038/cddis.2015.131] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 04/09/2015] [Accepted: 04/10/2015] [Indexed: 12/18/2022]
Abstract
The interplay between influenza virus and host factors to support the viral life cycle is well documented. Influenza A virus (IAV) proteins interact with an array of cellular proteins and hijack host pathways which are at the helm of cellular responses to facilitate virus invasion. The multifaceted nature of the ubiquitination pathway for protein regulation makes it a vulnerable target of many viruses including IAV. To this end we conducted a yeast two-hybrid screen to search for cellular ubiquitin ligases important for influenza virus replication. We identified host protein, RING finger protein 43 (RNF43), a RING-type E3 ubiquitin ligase, as a novel interactor of nucleoprotein (NP) of IAV and an essential partner to induce NP-driven p53-mediated apoptosis in IAV-infected cells. In this study, we demonstrate that IAV leads to attenuation of RNF43 transcripts and hence its respective protein levels in the cellular milieu whereas in RNF43 depleted cells, viral replication was escalated several folds. Moreover, RNF43 polyubiquitinates p53 which further leads to its destabilization resulting in a decrease in induction of the p53 apoptotic pathway, a hitherto unknown process targeted by NP for p53 stabilization and accumulation. Collectively, these results conclude that NP targets RNF43 to modulate p53 ubiquitination levels and hence causes p53 stabilization which is conducive to an enhanced apoptosis level in the host cells. In conclusion, our study unravels a novel strategy adopted by IAV for utilizing the much conserved ubiquitin proteasomal pathway.
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Affiliation(s)
- H Nailwal
- School of Science, Monash University Malaysia, Bandar Sunway, 47500 Petaling Jaya, Selangor DE, Malaysia
| | - S Sharma
- Virology Group, International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - A K Mayank
- Virology Group, International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - S K Lal
- 1] School of Science, Monash University Malaysia, Bandar Sunway, 47500 Petaling Jaya, Selangor DE, Malaysia [2] Virology Group, International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi 110067, India
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Mondal A, Potts GK, Dawson AR, Coon JJ, Mehle A. Phosphorylation at the homotypic interface regulates nucleoprotein oligomerization and assembly of the influenza virus replication machinery. PLoS Pathog 2015; 11:e1004826. [PMID: 25867750 PMCID: PMC4395114 DOI: 10.1371/journal.ppat.1004826] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Accepted: 03/21/2015] [Indexed: 11/22/2022] Open
Abstract
Negative-sense RNA viruses assemble large ribonucleoprotein (RNP) complexes that direct replication and transcription of the viral genome. Influenza virus RNPs contain the polymerase, genomic RNA and multiple copies of nucleoprotein (NP). During RNP assembly, monomeric NP oligomerizes along the length of the genomic RNA. Regulated assembly of the RNP is essential for virus replication, but how NP is maintained as a monomer that subsequently oligomerizes to form RNPs is poorly understood. Here we elucidate a mechanism whereby NP phosphorylation regulates oligomerization. We identified new evolutionarily conserved phosphorylation sites on NP and demonstrated that phosphorylation of NP decreased formation of higher-order complexes. Two phosphorylation sites were located on opposite sides of the NP:NP interface. In both influenza A and B virus, mutating or mimicking phosphorylation at these residues blocked homotypic interactions and drove NP towards a monomeric form. Highlighting the central role of this process during infection, these mutations impaired RNP formation, polymerase activity and virus replication. Thus, dynamic phosphorylation of NP regulates RNP assembly and modulates progression through the viral life cycle. Replication and transcription by negative-sense RNA viruses occurs in large macromolecular complexes. These complexes contain the viral polymerase, genomic RNA, and multiple copies of nucleoprotein that bind RNA and oligomerize to coat the genome. For influenza virus, nucleoprotein (NP) non-specifically binds nucleic acids and spontaneously oligomerizes. It is essential that a portion of NP be maintained as a monomer so that it can selectively oligomerize into replication complexes. Despite the fact that this process must be tightly regulated during the viral life cycle, how this regulation is achieved is largely unknown. Here we show that phosphorylation of NP negatively regulates assembly of the influenza virus replication machinery. We identified two phosphorylation sites on opposite sides of the NP:NP interface and showed that phosphorylation at either site blocks homotypic interactions, distorting the monomer:oligomer balance of NP in cells and severely impairing virus replication. Our findings show that the phospho-regulated conversion of NP between mono- and oligomeric states is important for RNP formation, gene expression and viral replication. Moreover, we showed that these critical phosphorylation sites play the same role in influenza B virus and are likely present in influenza C and D viruses, suggesting our results are broadly applicable across viral strains and genera and reveal a global regulatory strategy for Orthomyxoviridae.
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Affiliation(s)
- Arindam Mondal
- Medical Microbiology and Immunology, University of Wisconsin, Madison, Wisconsin, United States of America
| | - Gregory K. Potts
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin, United States of America
| | - Anthony R. Dawson
- Medical Microbiology and Immunology, University of Wisconsin, Madison, Wisconsin, United States of America
- Cellular and Molecular Biology Graduate Program, University of Wisconsin, Madison, Wisconsin, United States of America
| | - Joshua J. Coon
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin, United States of America
- Department of Biomolecular Chemistry, University of Wisconsin, Madison, Wisconsin, United States of America
| | - Andrew Mehle
- Medical Microbiology and Immunology, University of Wisconsin, Madison, Wisconsin, United States of America
- * E-mail:
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Generous A, Thorson M, Barcus J, Jacher J, Busch M, Sleister H. Identification of putative interactions between swine and human influenza A virus nucleoprotein and human host proteins. Virol J 2014; 11:228. [PMID: 25547032 PMCID: PMC4297426 DOI: 10.1186/s12985-014-0228-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Accepted: 12/15/2014] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Influenza A viruses (IAVs) are important pathogens that affect the health of humans and many additional animal species. IAVs are enveloped, negative single-stranded RNA viruses whose genome encodes at least ten proteins. The IAV nucleoprotein (NP) is a structural protein that associates with the viral RNA and is essential for virus replication. Understanding how IAVs interact with host proteins is essential for elucidating all of the required processes for viral replication, restrictions in species host range, and potential targets for antiviral therapies. METHODS In this study, the NP from a swine IAV was cloned into a yeast two-hybrid "bait" vector for expression of a yeast Gal4 binding domain (BD)-NP fusion protein. This "bait" was used to screen a Y2H human HeLa cell "prey" library which consisted of human proteins fused to the Gal4 protein's activation domain (AD). The interaction of "bait" and "prey" proteins resulted in activation of reporter genes. RESULTS Seventeen positive bait-prey interactions were isolated in yeast. All of the "prey" isolated also interact in yeast with a NP "bait" cloned from a human IAV strain. Isolation and sequence analysis of the cDNAs encoding the human prey proteins revealed ten different human proteins. These host proteins are involved in various host cell processes and structures, including purine biosynthesis (PAICS), metabolism (ACOT13), proteasome (PA28B), DNA-binding (MSANTD3), cytoskeleton (CKAP5), potassium channel formation (KCTD9), zinc transporter function (SLC30A9), Na+/K+ ATPase function (ATP1B1), and RNA splicing (TRA2B). CONCLUSIONS Ten human proteins were identified as interacting with IAV NP in a Y2H screen. Some of these human proteins were reported in previous screens aimed at elucidating host proteins relevant to specific viral life cycle processes such as replication. This study extends previous findings by suggesting a mechanism by which these host proteins associate with the IAV, i.e., physical interaction with NP. Furthermore, this study revealed novel host protein-NP interactions in yeast.
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Affiliation(s)
- Alex Generous
- Biology Department, Drake University, 1344 27th St., Des Moines, IA, 50311, USA.
| | - Molly Thorson
- Biology Department, Drake University, 1344 27th St., Des Moines, IA, 50311, USA.
| | - Jeff Barcus
- Biology Department, Drake University, 1344 27th St., Des Moines, IA, 50311, USA.
| | - Joseph Jacher
- Biology Department, Drake University, 1344 27th St., Des Moines, IA, 50311, USA.
| | - Marc Busch
- Biology Department, Drake University, 1344 27th St., Des Moines, IA, 50311, USA.
| | - Heidi Sleister
- Biology Department, Drake University, 1344 27th St., Des Moines, IA, 50311, USA.
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