1
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Guo X, Zhang M, Liu X, Zhang Y, Wang C, Guo Y. Attachment, Entry, and Intracellular Trafficking of Classical Swine Fever Virus. Viruses 2023; 15:1870. [PMID: 37766277 PMCID: PMC10534341 DOI: 10.3390/v15091870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 08/29/2023] [Accepted: 08/29/2023] [Indexed: 09/29/2023] Open
Abstract
Classical swine fever virus (CSFV), which is a positive-sense, single-stranded RNA virus with an envelope, is a member of the Pestivirus genus in the Flaviviridae family. CSFV causes a severe and highly contagious disease in pigs and is prevalent worldwide, threatening the pig farming industry. The detailed mechanisms of the CSFV life cycle have been reported, but are still limited. Some receptors and attachment factors of CSFV, including heparan sulfate (HS), laminin receptor (LamR), complement regulatory protein (CD46), MER tyrosine kinase (MERTK), disintegrin, and metalloproteinase domain-containing protein 17 (ADAM17), were identified. After attachment, CSFV internalizes via clathrin-mediated endocytosis (CME) and/or caveolae/raft-dependent endocytosis (CavME). After internalization, CSFV moves to early and late endosomes before uncoating. During this period, intracellular trafficking of CSFV relies on components of the endosomal sorting complex required for transport (ESCRT) and Rab proteins in the endosome dynamics, with a dependence on the cytoskeleton network. This review summarizes the data on the mechanisms of CSFV attachment, internalization pathways, and intracellular trafficking, and provides a general view of the early events in the CSFV life cycle.
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Affiliation(s)
| | | | | | | | | | - Yidi Guo
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Key Laboratory for Zoonosis Research of the Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun 130012, China
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2
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LaPorte M, Alverez C, Chatterley A, Kovaliov M, Carder EJ, Houghton MJ, Lim C, Miller ER, Samankumara LP, Liang M, Kerrigan K, Yue Z, Li S, Tomaino F, Wang F, Green N, Stott GM, Srivastava A, Chou TF, Wipf P, Huryn DM. Optimization of 1,2,4-Triazole-Based p97 Inhibitors for the Treatment of Cancer. ACS Med Chem Lett 2023; 14:977-985. [PMID: 37465292 PMCID: PMC10351062 DOI: 10.1021/acsmedchemlett.3c00163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 06/14/2023] [Indexed: 07/20/2023] Open
Abstract
The AAA+ ATPase p97 (valosin-containing protein, VCP) is a master regulator of protein homeostasis and therefore represents a novel target for cancer therapy. Starting from a known allosteric inhibitor, NMS-873, we systematically optimized this scaffold, in particular, by applying a benzene-to-acetylene isosteric replacement strategy, specific incorporation of F, and eutomer/distomer identification, which led to compounds that exhibited nanomolar biochemical and cell-based potency. In cellular pharmacodynamic assays, robust effects on biomarkers of p97 inhibition and apoptosis, including increased levels of ubiquitinated proteins, CHOP and cleaved caspase 3, were observed. Compound (R)-29 (UPCDC-30766) represents the most potent allosteric inhibitor of p97 reported to date.
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Affiliation(s)
- Matthew
G. LaPorte
- University
of Pittsburgh Chemical Diversity Center, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Celeste Alverez
- University
of Pittsburgh Chemical Diversity Center, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
- Department
of Pharmaceutical Sciences, University of
Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Alexander Chatterley
- University
of Pittsburgh Chemical Diversity Center, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Marina Kovaliov
- University
of Pittsburgh Chemical Diversity Center, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Evan J. Carder
- University
of Pittsburgh Chemical Diversity Center, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Michael J. Houghton
- University
of Pittsburgh Chemical Diversity Center, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Chaemin Lim
- University
of Pittsburgh Chemical Diversity Center, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Eric R. Miller
- University
of Pittsburgh Chemical Diversity Center, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Lalith P. Samankumara
- University
of Pittsburgh Chemical Diversity Center, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Mary Liang
- University
of Pittsburgh Chemical Diversity Center, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
- Department
of Pharmaceutical Sciences, University of
Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Kaylan Kerrigan
- University
of Pittsburgh Chemical Diversity Center, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Zhizhou Yue
- University
of Pittsburgh Chemical Diversity Center, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Shan Li
- Division
of Biology and Biological Engineering, California
Institute of Technology, Pasadena, California 91125, United States
| | - Francesca Tomaino
- Leidos
Biomedical Research, Inc., Frederick, Maryland 21702, United States
| | - Feng Wang
- Division
of Biology and Biological Engineering, California
Institute of Technology, Pasadena, California 91125, United States
| | - Neal Green
- Leidos
Biomedical Research, Inc., Frederick, Maryland 21702, United States
| | - Gordon M. Stott
- Leidos
Biomedical Research, Inc., Frederick, Maryland 21702, United States
| | - Apurva Srivastava
- Leidos
Biomedical Research, Inc., Frederick, Maryland 21702, United States
| | - Tsui-Fen Chou
- Division
of Biology and Biological Engineering, California
Institute of Technology, Pasadena, California 91125, United States
| | - Peter Wipf
- University
of Pittsburgh Chemical Diversity Center, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
- Department
of Pharmaceutical Sciences, University of
Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Donna M. Huryn
- University
of Pittsburgh Chemical Diversity Center, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
- Department
of Pharmaceutical Sciences, University of
Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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3
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Lyu M, Lai H, Wang Y, Zhou Y, Chen Y, Wu D, Chen J, Ying B. Roles of alternative splicing in infectious diseases: from hosts, pathogens to their interactions. Chin Med J (Engl) 2023; 136:767-779. [PMID: 36893312 PMCID: PMC10150853 DOI: 10.1097/cm9.0000000000002621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Indexed: 03/11/2023] Open
Abstract
ABSTRACT Alternative splicing (AS) is an evolutionarily conserved mechanism that removes introns and ligates exons to generate mature messenger RNAs (mRNAs), extremely improving the richness of transcriptome and proteome. Both mammal hosts and pathogens require AS to maintain their life activities, and inherent physiological heterogeneity between mammals and pathogens makes them adopt different ways to perform AS. Mammals and fungi conduct a two-step transesterification reaction by spliceosomes to splice each individual mRNA (named cis -splicing). Parasites also use spliceosomes to splice, but this splicing can occur among different mRNAs (named trans -splicing). Bacteria and viruses directly hijack the host's splicing machinery to accomplish this process. Infection-related changes are reflected in the spliceosome behaviors and the characteristics of various splicing regulators (abundance, modification, distribution, movement speed, and conformation), which further radiate to alterations in the global splicing profiles. Genes with splicing changes are enriched in immune-, growth-, or metabolism-related pathways, highlighting approaches through which hosts crosstalk with pathogens. Based on these infection-specific regulators or AS events, several targeted agents have been developed to fight against pathogens. Here, we summarized recent findings in the field of infection-related splicing, including splicing mechanisms of pathogens and hosts, splicing regulation and aberrant AS events, as well as emerging targeted drugs. We aimed to systemically decode host-pathogen interactions from a perspective of splicing. We further discussed the current strategies of drug development, detection methods, analysis algorithms, and database construction, facilitating the annotation of infection-related splicing and the integration of AS with disease phenotype.
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Affiliation(s)
- Mengyuan Lyu
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
| | - Hongli Lai
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
| | - Yili Wang
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
| | - Yanbing Zhou
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
| | - Yi Chen
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
| | - Dongsheng Wu
- Department of Thoracic Surgery and Institute of Thoracic Oncology, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
| | - Jie Chen
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
| | - Binwu Ying
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
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Kilgas S, Ramadan K. Inhibitors of the ATPase p97/VCP: From basic research to clinical applications. Cell Chem Biol 2023; 30:3-21. [PMID: 36640759 DOI: 10.1016/j.chembiol.2022.12.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 11/13/2022] [Accepted: 12/21/2022] [Indexed: 01/15/2023]
Abstract
Protein homeostasis deficiencies underlie various cancers and neurodegenerative diseases. The ubiquitin-proteasome system (UPS) and autophagy are responsible for most of the protein degradation in mammalian cells and, therefore, represent attractive targets for cancer therapy and that of neurodegenerative diseases. The ATPase p97, also known as VCP, is a central component of the UPS that extracts and disassembles its substrates from various cellular locations and also regulates different steps in autophagy. Several UPS- and autophagy-targeting drugs are in clinical trials. In this review, we focus on the development of various p97 inhibitors, including the ATPase inhibitors CB-5083 and CB-5339, which reached clinical trials by demonstrating effective anti-tumor activity across various tumor models, providing an effective alternative to targeting protein degradation for cancer therapy. Here, we provide an overview of how different p97 inhibitors have evolved over time both as basic research tools and effective UPS-targeting cancer therapies in the clinic.
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Affiliation(s)
- Susan Kilgas
- Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Oxford OX3 7DQ, UK.
| | - Kristijan Ramadan
- Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Oxford OX3 7DQ, UK.
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5
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del Rio Oliva M, Basler M. Valosin-containing protein (VCP/p97) inhibition reduces viral clearance and induces toxicity associated with muscular damage. Cell Death Dis 2022; 13:1015. [PMID: 36456548 PMCID: PMC9715549 DOI: 10.1038/s41419-022-05461-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 11/21/2022] [Accepted: 11/22/2022] [Indexed: 12/05/2022]
Abstract
Valosin-containing protein (VCP)/p97 has emerged as a central regulator of the ubiquitin-proteasome system by connecting ubiquitylation and degradation. The development of CB-5083, an ATPase D2-domain-selective and orally bioavailable inhibitor of VCP/p97, allows targeting of the ubiquitin-proteasome system in human diseases. In this study, we evaluated the effect of CB-5083 on the immune response in mice by using the lymphocytic choriomeningitis virus (LCMV) as an infection model. We demonstrate that LCMV infection increased the susceptibility to CB-5083 treatment in a CD8-independent manner. Administration of CB-5083 to mice reduced the cytotoxic T cell response and impaired viral clearance. Compared to uninfected cells, CB-5083 treatment enhanced the unfolded protein response in LCMV-infected cells. Administration of CB-5083 during the expansion of CD8+ T cells led to strong toxicity in mice within hours, which resulted in enhanced IL-6 levels in the serum and accumulation of poly-ubiquitinated proteins. Furthermore, we linked the observed toxicity to the specific formation of aggregates in the skeletal muscle tissue and the upregulation of both lactate dehydrogenase and creatine kinase in the serum.
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Affiliation(s)
- Marta del Rio Oliva
- grid.9811.10000 0001 0658 7699Division of Immunology, Department of Biology, University of Konstanz, Konstanz, Germany
| | - Michael Basler
- grid.9811.10000 0001 0658 7699Division of Immunology, Department of Biology, University of Konstanz, Konstanz, Germany ,grid.469411.fBiotechnology Institute Thurgau at the University of Konstanz, Kreuzlingen, Switzerland
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6
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Feng Z, Kovalev N, Nagy PD. Multifunctional role of the co-opted Cdc48 AAA+ ATPase in tombusvirus replication. Virology 2022; 576:1-17. [PMID: 36126429 DOI: 10.1016/j.virol.2022.08.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 08/07/2022] [Indexed: 10/31/2022]
Abstract
Replication of positive-strand RNA viruses depends on usurped cellular membranes and co-opted host proteins. Based on pharmacological inhibition and genetic and biochemical approaches, the authors identified critical roles of the cellular Cdc48 unfoldase/segregase protein in facilitating the replication of tomato bushy stunt virus (TBSV). We show that TBSV infection induces the expression of Cdc48 in Nicotiana benthamiana plants. Cdc48 binds to the TBSV replication proteins through its N-terminal region. In vitro TBSV replicase reconstitution experiments demonstrated that Cdc48 is needed for efficient replicase assembly and activity. Surprisingly, the in vitro replication experiments also showed that excess amount of Cdc48 facilitates the disassembly of the membrane-bound viral replicase-RNA template complex. Cdc48 is also needed for the recruitment of additional host proteins. Because several human viruses, including flaviviruses, utilize Cdc48, also called VCP/p97, for replication, we suggest that Cdc48 might be a common panviral host factor for plant and animal RNA viruses.
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Affiliation(s)
- Zhike Feng
- Department of Plant Pathology, University of Kentucky, Lexington, USA
| | - Nikolay Kovalev
- Department of Plant Pathology, University of Kentucky, Lexington, USA
| | - Peter D Nagy
- Department of Plant Pathology, University of Kentucky, Lexington, USA.
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7
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Sun RC, Hu JH, Li XH, Liu CC, Liu YY, Chen J, Yang YC, Zhou B. Valosin-containing protein (VCP/p97) is responsible for the endocytotic trafficking of classical swine fever virus. Vet Microbiol 2022; 272:109511. [PMID: 35849988 DOI: 10.1016/j.vetmic.2022.109511] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 06/30/2022] [Accepted: 07/09/2022] [Indexed: 11/25/2022]
Abstract
Classical swine fever virus (CSFV), a member of the Flaviviridae enveloped RNA virus family, results in an epidemic disease that brings serious economic losses to the pig industry worldwide. Valosin-containing protein (VCP/p97), a multifunctional active protein in cells, is related to the life activities of many viruses. However, the role of VCP in CSFV infection remains unknown. In this study, it was first found that treatment of VCP inhibitors impaired CSFV propagation. Furthermore, overexpression or knockdown of VCP showed that it was essential for CSFV infection. Moreover, confocal microscopy and immunoprecipitation assay showed that VCP was recruited for intracellular transport from early endosomes to lysosomes. Importantly, knockdown of VCP prevented CSFV to release from early endosomes, suggesting that VCP is a key factor for CSFV trafficking. Taken together, our findings first demonstrate that the endocytosis of CSFV into PK-15 cells requires the participation of VCP, providing the alternative approach for the discovery of novel anti-flaviviridae drugs.
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Affiliation(s)
- Rui-Cong Sun
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Jia-Huan Hu
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Xiao-Han Li
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Chun-Chun Liu
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Ya-Yun Liu
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Jing Chen
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Yi-Chen Yang
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Bin Zhou
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China; Key Laboratory of Animal Bacteriology, Ministry of Agriculture and Rural Affairs, Nanjing Agricultural University, Nanjing, China.
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Thompson L, Depledge DP, Burgess HM, Mohr I. An eIF3d-dependent switch regulates HCMV replication by remodeling the infected cell translation landscape to mimic chronic ER stress. Cell Rep 2022; 39:110767. [PMID: 35508137 DOI: 10.1016/j.celrep.2022.110767] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 02/07/2022] [Accepted: 04/11/2022] [Indexed: 11/20/2022] Open
Abstract
Regulated loading of eIF3-bound 40S ribosomes on capped mRNA is generally dependent upon the translation initiation factor eIF4E; however, mRNA translation often proceeds during physiological stress, such as virus infection, when eIF4E availability and activity are limiting. It remains poorly understood how translation of virus and host mRNAs are regulated during infection stress. While initially sensitive to mTOR inhibition, which limits eIF4E-dependent translation, we show that protein synthesis in human cytomegalovirus (HCMV)-infected cells unexpectedly becomes progressively reliant upon eIF3d. Targeting eIF3d selectively inhibits HCMV replication, reduces polyribosome abundance, and interferes with expression of essential virus genes and a host gene expression signature indicative of chronic ER stress that fosters HCMV reproduction. This reveals a strategy whereby cellular eIF3d-dependent protein production is hijacked to exploit virus-induced ER stress. Moreover, it establishes how switching between eIF4E and eIF3d-responsive cap-dependent translation can differentially tune virus and host gene expression in infected cells. Instead of eIF4E-regulated ribosome loading, Thompson et al. show capped mRNA translation in HCMV-infected cells becomes reliant upon eIF3d. Depleting eIF3d inhibits HCMV replication, reduces polyribosomes, and restricts virus late gene and host chronic ER stress-induced gene expression. Thus, switching to eIF3d-responsive translation tunes gene expression to support virus replication.
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Hong YM, Min SY, Kim D, Kim S, Seo D, Lee KH, Han SH. Human MicroRNAs Attenuate the Expression of Immediate Early Proteins and HCMV Replication during Lytic and Latent Infection in Connection with Enhancement of Phosphorylated RelA/p65 (Serine 536) That Binds to MIEP. Int J Mol Sci 2022; 23:ijms23052769. [PMID: 35269913 PMCID: PMC8911160 DOI: 10.3390/ijms23052769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 02/24/2022] [Accepted: 02/28/2022] [Indexed: 02/05/2023] Open
Abstract
Attenuating the expression of immediate early (IE) proteins is essential for controlling the lytic replication of human cytomegalovirus (HCMV). The human microRNAs (hsa-miRs), miR-200b-3p and miR-200c-3p, have been identified to bind the 3′-untranslated region (3′-UTR) of the mRNA encoding IE proteins. However, whether hsa-miRs can reduce IE72 expression and HCMV viral load or exhibit a crosstalk with the host cellular signaling machinery, most importantly the NF-κB cascade, has not been evaluated. In this study, argonaute-crosslinking and immunoprecipitation-seq revealed that miR-200b-3p and miR-200c-3p bind the 3′-UTR of UL123, which is a gene that encodes IE72. The binding of these miRNAs to the 3′-UTR of UL123 was verified in transfected cells stably expressing GFP. We used miR-200b-3p/miR-200c-3p mimics to counteract the downregulation of these miRNA after acute HCMV infection. This resulted in reduced IE72/IE86 expression and HCMV VL during lytic infection. We determined that IE72/IE86 alone can inhibit the phosphorylation of RelA/p65 at the Ser536 residue and that p-Ser536 RelA/p65 binds to the major IE promoter/enhancer (MIEP). The upregulation of miR-200b-3p and miR-200c-3p resulted in the phosphorylation of RelA/p65 at Ser536 through the downregulation of IE, and the binding of the resultant p-Ser536 RelA/p65 to MIEP resulted in a decreased production of pro-inflammatory cytokines. Overall, miR-200b-3p and miR-200c-3p—together with p-Ser536 RelA/p65—can prevent lytic HCMV replication during acute and latent infection
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Affiliation(s)
- Yeon-Mi Hong
- Division of Infectious Disease, Department of Internal Medicine, Yonsei University College of Medicine, Seoul 06273, Korea; (Y.-M.H.); (S.Y.M.); (D.K.); (S.K.); (K.H.L.)
| | - Seo Yeon Min
- Division of Infectious Disease, Department of Internal Medicine, Yonsei University College of Medicine, Seoul 06273, Korea; (Y.-M.H.); (S.Y.M.); (D.K.); (S.K.); (K.H.L.)
| | - Dayeong Kim
- Division of Infectious Disease, Department of Internal Medicine, Yonsei University College of Medicine, Seoul 06273, Korea; (Y.-M.H.); (S.Y.M.); (D.K.); (S.K.); (K.H.L.)
| | - Subin Kim
- Division of Infectious Disease, Department of Internal Medicine, Yonsei University College of Medicine, Seoul 06273, Korea; (Y.-M.H.); (S.Y.M.); (D.K.); (S.K.); (K.H.L.)
| | - Daekwan Seo
- Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul 06273, Korea;
| | - Kyoung Hwa Lee
- Division of Infectious Disease, Department of Internal Medicine, Yonsei University College of Medicine, Seoul 06273, Korea; (Y.-M.H.); (S.Y.M.); (D.K.); (S.K.); (K.H.L.)
| | - Sang Hoon Han
- Division of Infectious Disease, Department of Internal Medicine, Yonsei University College of Medicine, Seoul 06273, Korea; (Y.-M.H.); (S.Y.M.); (D.K.); (S.K.); (K.H.L.)
- Correspondence: ; Tel.: +82-2-2019-3319; Fax: +82-2-3463-3882
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10
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Wang F, Li S, Cheng KW, Rosencrans WM, Chou TF. The p97 Inhibitor UPCDC-30245 Blocks Endo-Lysosomal Degradation. Pharmaceuticals (Basel) 2022; 15:ph15020204. [PMID: 35215314 PMCID: PMC8880557 DOI: 10.3390/ph15020204] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2022] [Revised: 01/23/2022] [Accepted: 01/27/2022] [Indexed: 02/04/2023] Open
Abstract
The diverse modes of action of small molecule inhibitors provide versatile tools to investigate basic biology and develop therapeutics. However, it remains a challenging task to evaluate their exact mechanisms of action. We identified two classes of inhibitors for the p97 ATPase: ATP competitive and allosteric. We showed that the allosteric p97 inhibitor, UPCDC-30245, does not affect two well-known cellular functions of p97, endoplasmic-reticulum-associated protein degradation and the unfolded protein response pathway; instead, it strongly increases the lipidated form of microtubule-associated proteins 1A/1B light chain 3B (LC3-II), suggesting an alteration of autophagic pathways. To evaluate the molecular mechanism, we performed proteomic analysis of UPCDC-30245 treated cells. Our results revealed that UPCDC-30245 blocks endo-lysosomal degradation by inhibiting the formation of early endosome and reducing the acidity of the lysosome, an effect not observed with the potent p97 inhibitor CB-5083. This unique effect allows us to demonstrate UPCDC-30245 exhibits antiviral effects against coronavirus by blocking viral entry.
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Affiliation(s)
- Feng Wang
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA; (S.L.); (K.-W.C.); (W.M.R.)
- Correspondence: (F.W.); (T.-F.C.); Tel.: +1 626-395-6772 (T.-F.C.)
| | - Shan Li
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA; (S.L.); (K.-W.C.); (W.M.R.)
| | - Kai-Wen Cheng
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA; (S.L.); (K.-W.C.); (W.M.R.)
| | - William M. Rosencrans
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA; (S.L.); (K.-W.C.); (W.M.R.)
| | - Tsui-Fen Chou
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA; (S.L.); (K.-W.C.); (W.M.R.)
- Proteome Exploration Laboratory, Beckman Institute, California Institute of Technology, Pasadena, CA 91125, USA
- Correspondence: (F.W.); (T.-F.C.); Tel.: +1 626-395-6772 (T.-F.C.)
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11
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Yuan Y, Miao Y, Ren T, Huang F, Qian L, Chen X, Zuo Y, Zhang H, He J, Qiao C, Du Q, Wu Q, Zhang W, Zhu C, Xu Y, Wu D, Shi W, Jiang J, Xu G, Zheng H. High salt activates p97 to reduce host antiviral immunity by restricting Viperin induction. EMBO Rep 2022; 23:e53466. [PMID: 34779558 PMCID: PMC8728598 DOI: 10.15252/embr.202153466] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 10/15/2021] [Accepted: 10/21/2021] [Indexed: 01/07/2023] Open
Abstract
High-salt diets have recently been implicated in hypertension, cardiovascular disease, and autoimmune disease. However, whether and how dietary salt affects host antiviral response remain elusive. Here, we report that high salt induces an instant reduction in host antiviral immunity, although this effect is compromised during a long-term high-salt diet. Further studies reveal that high salt stimulates the acetylation at Lys663 of p97, which promotes the recruitment of ubiquitinated proteins for proteasome-dependent degradation. p97-mediated degradation of the deubiquitinase USP33 results in a deficiency of Viperin protein expression during viral infection, which substantially attenuates host antiviral ability. Importantly, switching to a low-salt diet during viral infection significantly enhances Viperin expression and improves host antiviral ability. These findings uncover dietary salt-induced regulation of ubiquitinated cellular proteins and host antiviral immunity, and could offer insight into the daily consumption of salt-containing diets during virus epidemics.
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Affiliation(s)
- Yukang Yuan
- International Institute of Infection and ImmunityInstitutes of Biology and Medical SciencesSuzhouChina
- Jiangsu Key Laboratory of Infection and ImmunitySoochow UniversitySuzhouChina
| | - Ying Miao
- International Institute of Infection and ImmunityInstitutes of Biology and Medical SciencesSuzhouChina
- Jiangsu Key Laboratory of Infection and ImmunitySoochow UniversitySuzhouChina
| | - Tengfei Ren
- International Institute of Infection and ImmunityInstitutes of Biology and Medical SciencesSuzhouChina
- Jiangsu Key Laboratory of Infection and ImmunitySoochow UniversitySuzhouChina
| | - Fan Huang
- International Institute of Infection and ImmunityInstitutes of Biology and Medical SciencesSuzhouChina
- Jiangsu Key Laboratory of Infection and ImmunitySoochow UniversitySuzhouChina
| | - Liping Qian
- International Institute of Infection and ImmunityInstitutes of Biology and Medical SciencesSuzhouChina
- Jiangsu Key Laboratory of Infection and ImmunitySoochow UniversitySuzhouChina
| | - Xiangjie Chen
- International Institute of Infection and ImmunityInstitutes of Biology and Medical SciencesSuzhouChina
- Jiangsu Key Laboratory of Infection and ImmunitySoochow UniversitySuzhouChina
| | - Yibo Zuo
- International Institute of Infection and ImmunityInstitutes of Biology and Medical SciencesSuzhouChina
- Jiangsu Key Laboratory of Infection and ImmunitySoochow UniversitySuzhouChina
| | - Hong‐Guang Zhang
- International Institute of Infection and ImmunityInstitutes of Biology and Medical SciencesSuzhouChina
- Jiangsu Key Laboratory of Infection and ImmunitySoochow UniversitySuzhouChina
| | - Jiuyi He
- International Institute of Infection and ImmunityInstitutes of Biology and Medical SciencesSuzhouChina
- Jiangsu Key Laboratory of Infection and ImmunitySoochow UniversitySuzhouChina
| | - Caixia Qiao
- International Institute of Infection and ImmunityInstitutes of Biology and Medical SciencesSuzhouChina
- Jiangsu Key Laboratory of Infection and ImmunitySoochow UniversitySuzhouChina
| | - Qian Du
- International Institute of Infection and ImmunityInstitutes of Biology and Medical SciencesSuzhouChina
- Jiangsu Key Laboratory of Infection and ImmunitySoochow UniversitySuzhouChina
| | - Qiuyu Wu
- International Institute of Infection and ImmunityInstitutes of Biology and Medical SciencesSuzhouChina
- Jiangsu Key Laboratory of Infection and ImmunitySoochow UniversitySuzhouChina
| | - Wei Zhang
- Department of Molecular and Cellular BiologyCollege of Biological ScienceUniversity of GuelphGuelphONCanada
| | - Chuanwu Zhu
- The Affiliated Infectious Diseases Hospital of Soochow UniversitySuzhouChina
| | - Yang Xu
- National Clinical Research Center for Hematologic DiseasesJiangsu Institute of Hematologythe First Affiliated Hospital of Soochow UniversityInstitute of Blood and Marrow TransplantationCollaborative Innovation Center of HematologySoochow UniversitySuzhouChina
| | - Depei Wu
- National Clinical Research Center for Hematologic DiseasesJiangsu Institute of Hematologythe First Affiliated Hospital of Soochow UniversityInstitute of Blood and Marrow TransplantationCollaborative Innovation Center of HematologySoochow UniversitySuzhouChina
| | - Weifeng Shi
- The Third Affiliated Hospital of Soochow UniversityChangzhouChina
| | - Jingting Jiang
- The Third Affiliated Hospital of Soochow UniversityChangzhouChina
| | - Guoqiang Xu
- College of Pharmaceutical SciencesSoochow UniversitySuzhouChina
| | - Hui Zheng
- International Institute of Infection and ImmunityInstitutes of Biology and Medical SciencesSuzhouChina
- Jiangsu Key Laboratory of Infection and ImmunitySoochow UniversitySuzhouChina
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12
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Abstract
Viruses are obligate intracellular parasites that are dependent on host factors for their replication. One such host protein, p97 or the valosin-containing protein (VCP), is a highly conserved AAA ATPase that facilitates replication of diverse RNA- and DNA-containing viruses. The wide range of cellular functions attributed to this ATPase is consistent with its participation in multiple steps of the virus life cycle from entry and uncoating to viral egress. Studies of VCP/p97 interactions with viruses will provide important information about host processes and cell biology, but also viral strategies that take advantage of these host functions. The critical role of p97 in viral replication might be exploited as a target for development of pan-antiviral drugs that exceed the capability of virus-specific vaccines or therapeutics.
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Affiliation(s)
- Poulami Das
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX 78712, USA;
| | - Jaquelin P. Dudley
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX 78712, USA;
- LaMontagne Center for Infectious Disease, The University of Texas at Austin, Austin, TX 78712, USA
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13
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Rosnoblet C, Chatelain P, Klinguer A, Bègue H, Winckler P, Pichereaux C, Wendehenne D. The chaperone-like protein Cdc48 regulates ubiquitin-proteasome system in plants. Plant Cell Environ 2021; 44:2636-2655. [PMID: 33908641 DOI: 10.1111/pce.14073] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 03/23/2021] [Accepted: 04/22/2021] [Indexed: 06/12/2023]
Abstract
The degradation of misfolded proteins is mainly mediated by the ubiquitin-proteasome system (UPS). UPS can be assisted by the protein Cdc48 but the relationship between UPS and Cdc48 in plants has been poorly investigated. Here, we analysed the regulation of UPS by Cdc48 in tobacco thanks to two independent cell lines overexpressing Cdc48 constitutively and plant leaves overexpressing Cdc48 transiently. In the cell lines, the accumulation of ubiquitinated proteins was affected both quantitatively and qualitatively and the number of proteasomal subunits was modified, while proteolytic activities were unchanged. Similarly, the over-expression of Cdc48 in planta impacted the accumulation of ubiquitinated proteins. A similar process occurred in leaves overexpressing transiently Rpn3, a proteasome subunit. Cdc48 being involved in plant immunity, its regulation of UPS was also investigated in response to cryptogein, an elicitor of immune responses. In the cell lines stably overexpressing Cdc48 and in leaves transiently overexpressing Cdc48 and/or Rpn3, cryptogein triggered a premature cell death while no increase of the proteasomal activity occurred. Overall, this study highlights a role for Cdc48 in ubiquitin homeostasis and confirms its involvement, as well as that of Rpn3, in the processes underlying the hypersensitive response.
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Affiliation(s)
- Claire Rosnoblet
- Agroécologie, AgroSup Dijon, CNRS, INRAE, Université de Bourgogne, Université Bourgogne Franche-Comté, Dijon, France
| | - Pauline Chatelain
- Agroécologie, AgroSup Dijon, CNRS, INRAE, Université de Bourgogne, Université Bourgogne Franche-Comté, Dijon, France
| | - Agnès Klinguer
- Agroécologie, AgroSup Dijon, CNRS, INRAE, Université de Bourgogne, Université Bourgogne Franche-Comté, Dijon, France
| | - Hervé Bègue
- Agroécologie, AgroSup Dijon, CNRS, INRAE, Université de Bourgogne, Université Bourgogne Franche-Comté, Dijon, France
- Laboratory of Parasitology and Mycology, Dijon University Hospital, Dijon, France
| | - Pascale Winckler
- Plateforme DimaCell, PAM UMR A 02.102, Université Bourgogne Franche-Comté, AgroSup Dijon, Dijon, France
| | - Carole Pichereaux
- Fédération de Recherche (FR3450), Agrobiosciences, Interactions et Biodiversité (AIB), CNRS, Toulouse, France
- Institut de Pharmacologie et de Biologie Structurale (IPBS), Université de Toulouse UPS, CNRS, Toulouse, France
| | - David Wendehenne
- Agroécologie, AgroSup Dijon, CNRS, INRAE, Université de Bourgogne, Université Bourgogne Franche-Comté, Dijon, France
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14
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Zhang G, Li S, Cheng KW, Chou TF. AAA ATPases as therapeutic targets: Structure, functions, and small-molecule inhibitors. Eur J Med Chem 2021; 219:113446. [PMID: 33873056 PMCID: PMC8165034 DOI: 10.1016/j.ejmech.2021.113446] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 03/21/2021] [Accepted: 03/30/2021] [Indexed: 01/07/2023]
Abstract
ATPases Associated with Diverse Cellular Activity (AAA ATPase) are essential enzymes found in all organisms. They are involved in various processes such as DNA replication, protein degradation, membrane fusion, microtubule serving, peroxisome biogenesis, signal transduction, and the regulation of gene expression. Due to the importance of AAA ATPases, several researchers identified and developed small-molecule inhibitors against these enzymes. We discuss six AAA ATPases that are potential drug targets and have well-developed inhibitors. We compare available structures that suggest significant differences of the ATP binding pockets among the AAA ATPases with or without ligand. The distances from ADP to the His20 in the His-Ser-His motif and the Arg finger (Arg353 or Arg378) in both RUVBL1/2 complex structures bound with or without ADP have significant differences, suggesting dramatically different interactions of the binding site with ADP. Taken together, the inhibitors of six well-studied AAA ATPases and their structural information suggest further development of specific AAA ATPase inhibitors due to difference in their structures. Future chemical biology coupled with proteomic approaches could be employed to develop variant specific, complex specific, and pathway specific inhibitors or activators for AAA ATPase proteins.
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Affiliation(s)
- Gang Zhang
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, United States.
| | - Shan Li
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, United States
| | - Kai-Wen Cheng
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, United States
| | - Tsui-Fen Chou
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, United States.
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15
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Gestuveo RJ, Royle J, Donald CL, Lamont DJ, Hutchinson EC, Merits A, Kohl A, Varjak M. Analysis of Zika virus capsid-Aedes aegypti mosquito interactome reveals pro-viral host factors critical for establishing infection. Nat Commun 2021; 12:2766. [PMID: 33986255 DOI: 10.1038/s41467-021-22966-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Accepted: 04/06/2021] [Indexed: 02/06/2023] Open
Abstract
The escalating global prevalence of arboviral diseases emphasizes the need to improve our understanding of their biology. Research in this area has been hindered by the lack of molecular tools for studying virus-mosquito interactions. Here, we develop an Aedes aegypti cell line which stably expresses Zika virus (ZIKV) capsid proteins in order to study virus-vector protein-protein interactions through quantitative label-free proteomics. We identify 157 interactors and show that eight have potentially pro-viral activity during ZIKV infection in mosquito cells. Notably, silencing of transitional endoplasmic reticulum protein TER94 prevents ZIKV capsid degradation and significantly reduces viral replication. Similar results are observed if the TER94 ortholog (VCP) functioning is blocked with inhibitors in human cells. In addition, we show that an E3 ubiquitin-protein ligase, UBR5, mediates the interaction between TER94 and ZIKV capsid. Our study demonstrates a pro-viral function for TER94/VCP during ZIKV infection that is conserved between human and mosquito cells.
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16
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Sehrawat S, Khasa R, Deb A, Prajapat SK, Mallick S, Basu A, Surjit M, Kalia M, Vrati S. Valosin-containing protein/p97 plays critical roles in the Japanese encephalitis virus life cycle. J Virol 2021; 95:JVI. [PMID: 33731458 DOI: 10.1128/JVI.02336-20] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Host factors provide critical support for every aspect of the virus life cycle. We recently identified the valosin-containing protein (VCP)/p97, an abundant cellular ATPase with diverse cellular functions, as a host factor important for Japanese encephalitis virus (JEV) replication. In cultured cells, using siRNA-mediated protein depletion and pharmacological inhibitors, we show that VCP is crucial for replication of three flaviviruses: JEV, Dengue, and West Nile viruses. An FDA-approved VCP inhibitor, CB-5083, extended survival of mice in the animal model of JEV infection. While VCP depletion did not inhibit JEV attachment on cells, it delayed capsid degradation, potentially through the entrapment of the endocytosed virus in clathrin-coated vesicles (CCVs). Early during infection, VCP-depleted cells showed an increased colocalization of JEV capsid with clathrin, and also higher viral RNA levels in purified CCVs. We show that VCP interacts with the JEV nonstructural protein NS5 and is an essential component of the virus replication complex. The depletion of the major VCP cofactor UFD-1 also significantly inhibited JEV replication. Mechanistically, thus, VCP affected two crucial steps of the JEV life cycle - nucleocapsid release and RNA replication. Our study establishes VCP as a common host factor with a broad antiviral potential against flaviviruses.ImportanceJEV is the leading cause of viral encephalitis epidemics in South-east Asia, affecting majorly children with high morbidity and mortality. Identification of host factors is thus essential for the rational design of anti-virals that are urgently need as therapeutics. Here we have identified the VCP protein as one such host-factor. This protein is highly abundant in cells and engages in diverse functions and cellular pathways by its ability to interact with different co-factors. Using siRNA mediated protein knockdown, we show that this protein is essential for release of the viral RNA into the cell so that it can initiate replication. The protein plays a second crucial role for the formation of the JEV replication complex. FDA-approved drugs targeting VCP show enhanced mouse survival in JE model of disease, suggesting that this could be a druggable target for flavivirus infections.
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17
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Abstract
The unfolded protein response (UPR) and endoplasmic reticulum (ER)-associated degradation (ERAD) are two essential components of the quality control system for proteins in the secretory pathway. When unfolded proteins accumulate in the ER, UPR sensors such as IRE1 induce the expression of ERAD genes, thereby increasing protein export from the ER to the cytosol and subsequent degradation by the proteasome. Conversely, IRE1 itself is an ERAD substrate, indicating that the UPR and ERAD regulate each other. Viruses are intracellular parasites that exploit the host cell for their own benefit. Cytomegaloviruses selectively modulate the UPR to take advantage of beneficial and inhibit detrimental effects on viral replication. We have previously shown that murine and human cytomegaloviruses express homologous proteins (M50 and UL50, respectively) that dampen the UPR at late times post infection by inducing IRE1 degradation. However, the degradation mechanism has remained uncertain. Here we show that the cytomegalovirus M50 protein mediates IRE1 degradation by the proteasome. M50-dependent IRE1 degradation can be blocked by pharmacological inhibition of p97/VCP or by genetic ablation of SEL1L, both of which are components of the ERAD machinery. SEL1L acts as a cofactor of the E3 ubiquitin ligase HRD1, while p97/VCP is responsible for the extraction of ubiquitylated proteins from the ER to the cytosol. We further show that M50 facilitates the IRE1-SEL1L interaction by binding to both, IRE1 and SEL1L. These results indicate that the viral M50 protein dampens the UPR by tethering IRE1 to SEL1L, thereby promoting its degradation by the ERAD machinery.IMPORTANCE Viruses infect cells of their host and force them to produce virus progeny. This can impose stress on the host cell and activate counter-regulatory mechanisms. Protein overload in the endoplasmic reticulum (ER) leads to ER stress and triggers the unfolded protein response, which in turn upregulates protein folding and increases the degradation of proteins in the ER. Previous work has shown that cytomegaloviruses interfere with the unfolded protein response by degrading the sensor molecule IRE1. Herein we demonstrate how the cytomegalovirus M50 protein exploits the ER-associated degradation machinery to dispose of IRE1. Degradation of IRE1 curbs the unfolded protein response and helps the virus to increase the synthesis of its own proteins and the production of virus progeny.
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18
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Bouwer MF, Hamilton KE, Jonker PB, Kuiper SR, Louters LL, Looyenga BD. NMS-873 functions as a dual inhibitor of mitochondrial oxidative phosphorylation. Biochimie 2021; 185:33-42. [PMID: 33727138 DOI: 10.1016/j.biochi.2021.03.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 03/02/2021] [Accepted: 03/06/2021] [Indexed: 11/18/2022]
Abstract
Small-molecule inhibitors of enzyme function are critical tools for the study of cell biological processes and for treatment of human disease. Identifying inhibitors with suitable specificity and selectivity for single enzymes, however, remains a challenge. In this study we describe our serendipitous discovery that NMS-873, a compound that was previously identified as a highly selective allosteric inhibitor of the ATPase valosin-containing protein (VCP/p97), rapidly induces aerobic fermentation in cultured human and mouse cells. Our further investigation uncovered an unexpected off-target effect of NMS-873 on mitochondrial oxidative phosphorylation, specifically as a dual inhibitor of Complex I and ATP synthase. This work points to the need for caution regarding the interpretation of cell survival data associated with NMS-873 treatment and indicates that cellular toxicity associated with its use may be caused by both VCP/p97-dependent and VCP/p97-independent mechanisms.
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Affiliation(s)
- Miranda F Bouwer
- Calvin University, Department of Chemistry & Biochemistry, 1726 Knollcrest Circle SE, Grand Rapids, MI, 49546, USA
| | - Kathryn E Hamilton
- Calvin University, Department of Chemistry & Biochemistry, 1726 Knollcrest Circle SE, Grand Rapids, MI, 49546, USA
| | - Patrick B Jonker
- Calvin University, Department of Chemistry & Biochemistry, 1726 Knollcrest Circle SE, Grand Rapids, MI, 49546, USA
| | - Sam R Kuiper
- Calvin University, Department of Chemistry & Biochemistry, 1726 Knollcrest Circle SE, Grand Rapids, MI, 49546, USA
| | - Larry L Louters
- Calvin University, Department of Chemistry & Biochemistry, 1726 Knollcrest Circle SE, Grand Rapids, MI, 49546, USA
| | - Brendan D Looyenga
- Calvin University, Department of Chemistry & Biochemistry, 1726 Knollcrest Circle SE, Grand Rapids, MI, 49546, USA.
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19
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Zhang S, Springer LE, Rao HZ, Espinosa Trethewy RG, Bishop LM, Hancock MH, Grey F, Snyder CM. Hematopoietic cell-mediated dissemination of murine cytomegalovirus is regulated by NK cells and immune evasion. PLoS Pathog 2021; 17:e1009255. [PMID: 33508041 PMCID: PMC7872266 DOI: 10.1371/journal.ppat.1009255] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 02/09/2021] [Accepted: 12/21/2020] [Indexed: 02/06/2023] Open
Abstract
Cytomegalovirus (CMV) causes clinically important diseases in immune compromised and immune immature individuals. Based largely on work in the mouse model of murine (M)CMV, there is a consensus that myeloid cells are important for disseminating CMV from the site of infection. In theory, such dissemination should expose CMV to cell-mediated immunity and thus necessitate evasion of T cells and NK cells. However, this hypothesis remains untested. We constructed a recombinant MCMV encoding target sites for the hematopoietic specific miRNA miR-142-3p in the essential viral gene IE3. This virus disseminated poorly to the salivary gland following intranasal or footpad infections but not following intraperitoneal infection in C57BL/6 mice, demonstrating that dissemination by hematopoietic cells is essential for specific routes of infection. Remarkably, depletion of NK cells or T cells restored dissemination of this virus in C57BL/6 mice after intranasal infection, while dissemination occurred normally in BALB/c mice, which lack strong NK cell control of MCMV. These data show that cell-mediated immunity is responsible for restricting MCMV to hematopoietic cell-mediated dissemination. Infected hematopoietic cells avoided cell-mediated immunity via three immune evasion genes that modulate class I MHC and NKG2D ligands (m04, m06 and m152). MCMV lacking these 3 genes spread poorly to the salivary gland unless NK cells were depleted, but also failed to replicate persistently in either the nasal mucosa or salivary gland unless CD8+ T cells were depleted. Surprisingly, CD8+ T cells primed after intranasal infection required CD4+ T cell help to expand and become functional. Together, our data suggest that MCMV can use both hematopoietic cell-dependent and -independent means of dissemination after intranasal infection and that cell mediated immune responses restrict dissemination to infected hematopoietic cells, which are protected from NK cells during dissemination by viral immune evasion. In contrast, viral replication within mucosal tissues depends on evasion of T cells. Cytomegalovirus (CMV) is a common cause of disease in immune compromised individuals as well as a common cause of congenital infections leading to disease in newborns. The virus is thought to enter primarily via mucosal barrier tissues, such as the oral and nasal mucosa. However, it is not clear how the virus escapes these barrier tissues to reach distant sites. In this study, we used a mouse model of CMV infection. Our data illustrate a complex balance between the immune system and viral infection of “myeloid cells”, which are most commonly thought to carry the virus around the body after infection. In particular, our data suggest that robust immune responses at the site of infection force the virus to rely on myeloid cells to escape the site of infection. Moreover, viral genes designed to evade these immune responses were needed to protect the virus during and after its spread to distant sites. Together, this work sheds light on the mechanisms of immune control and viral survival during CMV infection of mucosal tissues and spread to distant sites of the body.
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Affiliation(s)
- Shunchuan Zhang
- Department of Microbiology and Immunology, Sidney Kimmel Medical College, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America
| | - Lauren E. Springer
- Department of Microbiology and Immunology, Sidney Kimmel Medical College, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America
| | - Han-Zhi Rao
- Department of Microbiology and Immunology, Sidney Kimmel Medical College, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America
| | - Renee G. Espinosa Trethewy
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, Oregon, United States of America
| | - Lindsey M. Bishop
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, Oregon, United States of America
| | - Meaghan H. Hancock
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, Oregon, United States of America
| | - Finn Grey
- Division of Infection and Immunity, The Roslin Institute, University of Edinburgh, Easter Bush, Midlothian, United Kingdom
- * E-mail: (FG); (CMS)
| | - Christopher M. Snyder
- Department of Microbiology and Immunology, Sidney Kimmel Medical College, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America
- * E-mail: (FG); (CMS)
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20
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Abstract
The AAA+ (ATPase associated with various cellular activities) protein p97, also called valosin-containing protein, is a hexameric ring ATPase and uses ATP hydrolysis to unfold or extract proteins from biological complexes. Many cellular processes are affected by p97 including ER-associated degradation, DNA damage response, cell signaling (NF-κB), cell cycle progression, autophagy, and others. Not surprisingly, with its role in many fundamental cellular processes, p97 function is important for the replication of many viruses. We tested irreversible p97-targeting compounds for their ability to inhibit the replication of multiple viruses compared to the known p97 inhibitors NMS-873 and CB-5083. Our results indicate that overall cellular toxicity for p97 compounds provides a challenge for antivirals targeting p97. However, we identified one compound with sub-micromolar activity against human cytomegalovirus and improved cell viability to provide evidence for the potential of irreversible p97 inhibitors as antivirals. ![]()
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Affiliation(s)
- Yan Wang
- Center for Drug Design, College of Pharmacy, University of Minnesota, Minneapolis, MN 55455 USA
- Present Address: Translational Medicine R&D Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055 China
| | - Ruben Soto-Acosta
- Center for Drug Design, College of Pharmacy, University of Minnesota, Minneapolis, MN 55455 USA
| | - Rui Ding
- Center for Drug Design, College of Pharmacy, University of Minnesota, Minneapolis, MN 55455 USA
| | - Liqiang Chen
- Center for Drug Design, College of Pharmacy, University of Minnesota, Minneapolis, MN 55455 USA
| | - Robert J. Geraghty
- Center for Drug Design, College of Pharmacy, University of Minnesota, Minneapolis, MN 55455 USA
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21
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Meng C, Liu LK, Li DL, Gao RL, Fan WW, Wang KJ, Wang HC, Liu HP. White Spot Syndrome Virus Benefits from Endosomal Trafficking, Substantially Facilitated by a Valosin-Containing Protein, To Escape Autophagic Elimination and Propagate in the Crustacean Cherax quadricarinatus. J Virol 2020; 94:e01570-20. [PMID: 32967962 DOI: 10.1128/JVI.01570-20] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 09/15/2020] [Indexed: 12/19/2022] Open
Abstract
As the most severely lethal viral pathogen for crustaceans in both brackish water and freshwater, white spot syndrome virus (WSSV) has a mechanism of infection that remains largely unknown, which profoundly limits the control of WSSV disease. By using a hematopoietic tissue (Hpt) stem cell culture from the red claw crayfish Cherax quadricarinatus suitable for WSSV propagation in vitro, the intracellular trafficking of live WSSV, in which the acidic-pH-dependent endosomal environment was a prerequisite for WSSV fusion, was determined for the first time via live-cell imaging. When the acidic pH within the endosome was alkalized by chemicals, the intracellular WSSV virions were detained in dysfunctional endosomes, resulting in appreciable blocking of the viral infection. Furthermore, disrupted valosin-containing protein (C. quadricarinatus VCP [CqVCP]) activity resulted in considerable aggregation of endocytic WSSV virions in the disordered endosomes, which subsequently recruited autophagosomes, likely by binding to CqGABARAP via CqVCP, to eliminate the aggregated virions within the dysfunctional endosomes. Importantly, both autophagic sorting and the degradation of intracellular WSSV virions were clearly enhanced in Hpt cells with increased autophagic activity, demonstrating that autophagy played a defensive role against WSSV infection. Intriguingly, most of the endocytic WSSV virions were directed to the endosomal delivery system facilitated by CqVCP activity so that they avoided autophagy degradation and successfully delivered the viral genome into Hpt cell nuclei, which was followed by the propagation of progeny virions. These findings will benefit anti-WSSV target design against the most severe viral disease currently affecting farmed crustaceans.IMPORTANCE White spot disease is currently the most devastating viral disease in farmed crustaceans, such as shrimp and crayfish, and has resulted in a severe ecological problem for both brackish water and freshwater aquaculture areas worldwide. Efficient antiviral control of WSSV disease is still lacking due to our limited knowledge of its pathogenesis. Importantly, research on the WSSV infection mechanism is also quite meaningful for the elucidation of viral pathogenesis and virus-host coevolution, as WSSV is one of the largest animal viruses, in terms of genome size, that infects only crustaceans. Here, we found that most of the endocytic WSSV virions were directed to the endosomal delivery system, strongly facilitated by CqVCP, so that they avoided autophagic degradation and successfully delivered the viral genome into the Hpt cell nucleus for propagation. Our data point to a virus-sorting model that might also explain the escape of other enveloped DNA viruses.
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Collins-McMillen D, Kamil J, Moorman N, Goodrum F. Control of Immediate Early Gene Expression for Human Cytomegalovirus Reactivation. Front Cell Infect Microbiol 2020; 10:476. [PMID: 33072616 PMCID: PMC7533536 DOI: 10.3389/fcimb.2020.00476] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Accepted: 08/03/2020] [Indexed: 12/16/2022] Open
Abstract
Human cytomegalovirus (HCMV) is a beta herpesvirus that persists for life in the majority of the world's population. The persistence of HCMV in the human population is due to the exquisite ability of herpesviruses to establish a latent infection that evades elimination by the host immune response. How the virus moves into and out of the latent state has been an intense area of research focus and debate. The prevailing paradigm is that the major immediate early promoter (MIEP), which drives robust expression of the major immediate early (MIE) transactivators, is epigenetically silenced during the establishment of latency, and must be reactivated for the virus to exit latency and re-enter productive replication. While it is clear that the MIEP is silenced by the association of repressive chromatin remodeling factors and histone marks, the mechanisms by which HCMV de-represses MIE gene expression for reactivation are less well understood. We have identified alternative promoter elements within the MIE locus that drive a second or delayed phase of MIE gene expression during productive infection. In the context of reactivation in THP-1 macrophages and primary CD34+ human progenitor cells, MIE transcripts are predominantly derived from initiation at these alternative promoters. Here we review the mechanisms by which alternative viral promoters might tailor the control of viral gene expression and the corresponding pattern of infection to specific cell types. Alternative promoter control of the HCMV MIE locus increases versatility in the system and allows the virus to tightly repress viral gene expression for latency but retain the ability to sense and respond to cell type-specific host cues for reactivation of replication.
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Affiliation(s)
- Donna Collins-McMillen
- Department of Immunobiology and BIO5 Institute, University of Arizona, Tucson, AZ, United States
| | - Jeremy Kamil
- Department of Microbiology and Immunology, Louisiana State University Health Sciences Center - Shreveport, Shreveport, LA, United States
| | - Nathaniel Moorman
- Department of Microbiology and Immunology, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Felicia Goodrum
- Department of Immunobiology and BIO5 Institute, University of Arizona, Tucson, AZ, United States
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Lee MK, Hyeon S, Ahn JH. The Human Cytomegalovirus Transmembrane Protein pUL50 Induces Loss of VCP/p97 and Is Regulated by a Small Isoform of pUL50. J Virol 2020; 94:e00110-20. [PMID: 32321808 DOI: 10.1128/JVI.00110-20] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Accepted: 04/10/2020] [Indexed: 11/20/2022] Open
Abstract
The human cytomegalovirus (HCMV) UL50 gene encodes a transmembrane protein, pUL50, which acts as a core component of the nuclear egress complex (NEC) for nucleocapsids. Recently, pUL50 has been shown to have NEC-independent activities: downregulation of IRE1 to repress the unfolded protein response and degradation of UBE1L to inhibit the protein ISG15 modification pathway. Here, we demonstrate that a 26-kDa N-terminal truncated isoform of pUL50 (UL50-p26) is expressed from an internal methionine at amino acid position 199 and regulates the activity of pUL50 to induce the loss of valosin-containing protein (VCP/p97). A UL50(M199V) mutant virus expressing pUL50(M199V) but not UL50-p26 showed delayed growth at a low multiplicity of infection. There was also delayed accumulation of the viral immediate early 2 (IE2) protein in the mutant virus, and this correlated with the reduced expression of VCP/p97, which promotes IE2 expression. Infection with mutant virus did not significantly alter ISGylation levels. In transient expression assays, pUL50 induced VCP/p97 loss posttranscriptionally, and this was dependent on the presence of its transmembrane domain. In contrast, UL50-p26 did not destabilize VCP/p97 but, rather, inhibited pUL50-mediated VCP/p97 loss and the associated major IE gene suppression. Both pUL50 and UL50-p26 interacted with VCP/p97, although UL50-p26 did so more weakly than pUL50. UL50-p26 interacted with pUL50, and this interaction was much stronger than the pUL50 self-interaction. Furthermore, UL50-p26 was able to interfere with the pUL50-VCP/p97 interaction. Our study newly identifies UL50-p26 expression during HCMV infection and suggests a regulatory role for UL50-p26 in blocking pUL50-mediated VCP/p97 loss by associating with pUL50.IMPORTANCE Targeting the endoplasmic reticulum (ER) by viral proteins may affect ER-associated protein homeostasis. During human cytomegalovirus (HCMV) infection, pUL50 targets the ER through its transmembrane domain and moves to the inner nuclear membrane (INM) to form the nuclear egress complex (NEC), which facilitates capsid transport from the nucleus to the cytoplasm. Here, we demonstrate that pUL50 induces the loss of valosin-containing protein (VCP/p97), which promotes the expression of viral major immediate early gene products, in a manner dependent on its membrane targeting but that a small isoform of pUL50 is expressed to negatively regulate this pUL50 activity. This study reports a new NEC-independent function of pUL50 and highlights the fine regulation of pUL50 activity by a smaller isoform for efficient viral growth.
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Lee CH, Grey F. Systems Virology and Human Cytomegalovirus: Using High Throughput Approaches to Identify Novel Host-Virus Interactions During Lytic Infection. Front Cell Infect Microbiol 2020; 10:280. [PMID: 32587832 PMCID: PMC7298070 DOI: 10.3389/fcimb.2020.00280] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Accepted: 05/12/2020] [Indexed: 12/16/2022] Open
Abstract
Human Cytomegalovirus (HCMV) is a highly prevalent herpesvirus, persistently infecting between 30 and 100% of the population, depending on socio-economic status (Fields et al., 2013). HCMV remains an important clinical pathogen accounting for more than 60% of complications associated with solid organ transplant patients (Kotton, 2013; Kowalsky et al., 2013; Bruminhent and Razonable, 2014). It is also the leading cause of infectious congenital birth defects and has been linked to chronic inflammation and immune aging (Ballard et al., 1979; Griffith et al., 2016; Jergovic et al., 2019). There is currently no effective vaccine and HCMV antivirals have significant side effects. As current antivirals target viral genes, the virus can develop resistance, reducing drug efficacy. There is therefore an urgent need for new antiviral agents that are effective against HCMV, have better toxicity profiles and are less vulnerable to the emergence of resistant strains. Targeting of host factors that are critical to virus replication is a potential strategy for the development of novel antivirals that circumvent the development of viral resistance. Systematic high throughput approaches provide powerful methods for the identification of novel host-virus interactions. As well as contributing to our basic understanding of virus and cell biology, such studies provide potential targets for the development of novel antiviral agents. High-throughput studies, such as RNA sequencing, proteomics, and RNA interference screens, are useful tools to identify HCMV-induced global changes in host mRNA and protein expression levels and host factors important for virus replication. Here, we summarize new findings on HCMV lytic infection from high-throughput studies since 2014 and how screening approaches have evolved.
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Affiliation(s)
- Chen-Hsuin Lee
- Division of Infection and Immunity, Roslin Institute, The University of Edinburgh, Edinburgh, United Kingdom
| | - Finn Grey
- Division of Infection and Immunity, Roslin Institute, The University of Edinburgh, Edinburgh, United Kingdom
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25
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Li Y, Hu L, Chen T, Chang M, Deng F, Hu Z, Wang H, Wang M. Host AAA+ ATPase TER94 Plays Critical Roles in Building the Baculovirus Viral Replication Factory and Virion Morphogenesis. J Virol 2020; 94:e01674-19. [PMID: 31896597 DOI: 10.1128/JVI.01674-19] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2019] [Accepted: 12/19/2019] [Indexed: 12/21/2022] Open
Abstract
TER94 is a multifunctional AAA+ ATPase crucial for diverse cellular processes, especially protein quality control and chromatin dynamics in eukaryotic organisms. Many viruses, including coronavirus, herpesvirus, and retrovirus, coopt host cellular TER94 for optimal viral invasion and replication. Previous proteomics analysis identified the association of TER94 with the budded virions (BVs) of baculovirus, an enveloped insect large DNA virus. Here, the role of TER94 in the prototypic baculovirus Autographa californica multiple nucleopolyhedrovirus (AcMNPV) life cycle was investigated. In virus-infected cells, TER94 accumulated in virogenic stroma (VS) at the early stage of infection and subsequently partially rearranged in the ring zone region. In the virions, TER94 was associated with the nucleocapsids of both BV and occlusion-derived virus (ODV). Inhibition of TER94 ATPase activity significantly reduced viral DNA replication and BV production. Electron/immunoelectron microscopy revealed that inhibition of TER94 resulted in the trapping of nucleocapsids within cytoplasmic vacuoles at the nuclear periphery for BV formation and blockage of ODV envelopment at a premature stage within infected nuclei, which appeared highly consistent with its pivotal function in membrane biogenesis. Further analyses showed that TER94 was recruited to the VS or subnuclear structures through interaction with viral early proteins LEF3 and helicase, whereas inhibition of TER94 activity blocked the proper localization of replication-related viral proteins and morphogenesis of VS, providing an explanation for its role in viral DNA replication. Taken together, these data indicated the crucial functions of TER94 at multiple steps of the baculovirus life cycle, including genome replication, BV formation, and ODV morphogenesis.IMPORTANCE TER94 constitutes an important AAA+ ATPase that associates with diverse cellular processes, including protein quality control, membrane fusion of the Golgi apparatus and endoplasmic reticulum network, nuclear envelope reformation, and DNA replication. To date, little is known regarding the role(s) of TER94 in the baculovirus life cycle. In this study, TER94 was found to play a crucial role in multiple steps of baculovirus infection, including viral DNA replication and BV and ODV formation. Further evidence showed that the membrane fission/fusion function of TER94 is likely to be exploited by baculovirus for virion morphogenesis. Moreover, TER94 could interact with the viral early proteins LEF3 and helicase to transport and further recruit viral replication-related proteins to establish viral replication factories. This study highlights the critical roles of TER94 as an energy-supplying chaperon in the baculovirus life cycle and enriches our knowledge regarding the biological function of this important host factor.
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Hashimoto Y, Sheng X, Murray-Nerger LA, Cristea IM. Temporal dynamics of protein complex formation and dissociation during human cytomegalovirus infection. Nat Commun 2020; 11:806. [PMID: 32041945 DOI: 10.1038/s41467-020-14586-5] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Accepted: 01/10/2020] [Indexed: 12/23/2022] Open
Abstract
The co-evolution and co-existence of viral pathogens with their hosts for millions of years is reflected in dynamic virus-host protein-protein interactions (PPIs) that are intrinsic to the spread of infections. Here, we investigate the system-wide dynamics of protein complexes throughout infection with the herpesvirus, human cytomegalovirus (HCMV). Integrating thermal shift assays and mass spectrometry quantification with virology and microscopy, we monitor the temporal formation and dissociation of hundreds of functional protein complexes and the dynamics of host-host, virus-host, and virus-virus PPIs. We establish pro-viral roles for cellular protein complexes and translocating proteins. We show the HCMV receptor integrin beta 1 dissociates from extracellular matrix proteins, becoming internalized with CD63, which is necessary for virus production. Moreover, this approach facilitates characterization of essential viral proteins, such as pUL52. This study of temporal protein complex dynamics provides insights into mechanisms of HCMV infection and a resource for biological and therapeutic studies. Here, Hashimoto et al. apply mass spectrometry-based thermal proximity coaggregation to characterize the temporal dynamics of virus-host protein-protein interactions during human cytomegalovirus (HCMV) infection, uncovering proviral functions including the internalization of the HCMV receptor integrin beta 1 with CD63.
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Adamson CS, Nevels MM. Bright and Early: Inhibiting Human Cytomegalovirus by Targeting Major Immediate-Early Gene Expression or Protein Function. Viruses 2020; 12:v12010110. [PMID: 31963209 PMCID: PMC7019229 DOI: 10.3390/v12010110] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 01/07/2020] [Accepted: 01/08/2020] [Indexed: 12/11/2022] Open
Abstract
The human cytomegalovirus (HCMV), one of eight human herpesviruses, establishes lifelong latent infections in most people worldwide. Primary or reactivated HCMV infections cause severe disease in immunosuppressed patients and congenital defects in children. There is no vaccine for HCMV, and the currently approved antivirals come with major limitations. Most approved HCMV antivirals target late molecular processes in the viral replication cycle including DNA replication and packaging. “Bright and early” events in HCMV infection have not been exploited for systemic prevention or treatment of disease. Initiation of HCMV replication depends on transcription from the viral major immediate-early (IE) gene. Alternative transcripts produced from this gene give rise to the IE1 and IE2 families of viral proteins, which localize to the host cell nucleus. The IE1 and IE2 proteins are believed to control all subsequent early and late events in HCMV replication, including reactivation from latency, in part by antagonizing intrinsic and innate immune responses. Here we provide an update on the regulation of major IE gene expression and the functions of IE1 and IE2 proteins. We will relate this insight to experimental approaches that target IE gene expression or protein function via molecular gene silencing and editing or small chemical inhibitors.
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Abstract
The AAA+ ATPase, p97, also referred to as VCP, plays an essential role in cellular homeostasis by regulating endoplasmic reticulum-associated degradation (ERAD), mitochondrial-associated degradation (MAD), chromatin-associated degradation, autophagy, and endosomal trafficking. Mutations in p97 have been linked to a number of neurodegenerative diseases, and overexpression of wild type p97 is observed in numerous cancers. Furthermore, p97 activity has been shown to be essential for the replication of certain viruses, including poliovirus, herpes simplex virus (HSV), cytomegalovirus (CMV), and influenza. Taken together, these observations highlight the potential for targeting p97 as a therapeutic approach in neurodegeneration, cancer, and certain infectious diseases. This Perspective reviews recent advances in the discovery of small molecule inhibitors of p97, their optimization and characterization, and therapeutic potential.
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Lee CH, Griffiths S, Digard P, Pham N, Auer M, Haas J, Grey F. Asparagine Deprivation Causes a Reversible Inhibition of Human Cytomegalovirus Acute Virus Replication. mBio 2019; 10:e01651-19. [PMID: 31594813 PMCID: PMC6786868 DOI: 10.1128/mbio.01651-19] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Accepted: 09/12/2019] [Indexed: 01/03/2023] Open
Abstract
As obligate intracellular pathogens, viruses rely on the host cell machinery to replicate efficiently, with the host metabolism extensively manipulated for this purpose. High-throughput small interfering RNA (siRNA) screens provide a systematic approach for the identification of novel host-virus interactions. Here, we report a large-scale screen for host factors important for human cytomegalovirus (HCMV), consisting of 6,881 siRNAs. We identified 47 proviral factors and 68 antiviral factors involved in a wide range of cellular processes, including the mediator complex, proteasome function, and mRNA splicing. Focused characterization of one of the hits, asparagine synthetase (ASNS), demonstrated a strict requirement for asparagine for HCMV replication which leads to an early block in virus replication before the onset of DNA amplification. This effect is specific to HCMV, as knockdown of ASNS had little effect on herpes simplex virus 1 or influenza A virus replication, suggesting that the restriction is not simply due to a failure in protein production. Remarkably, virus replication could be completely rescued 7 days postinfection with the addition of exogenous asparagine, indicating that while virus replication is restricted at an early stage, it maintains the capacity for full replication days after initial infection. This study represents the most comprehensive siRNA screen for the identification of host factors involved in HCMV replication and identifies the nonessential amino acid asparagine as a critical factor in regulating HCMV virus replication. These results have implications for control of viral latency and the clinical treatment of HCMV in patients.IMPORTANCE HCMV accounts for more than 60% of complications associated with solid organ transplant patients. Prophylactic or preventative treatment with antivirals, such as ganciclovir, reduces the occurrence of early onset HCMV disease. However, late onset disease remains a significant problem, and prolonged treatment, especially in patients with suppressed immune systems, greatly increases the risk of antiviral resistance. Very few antivirals have been developed for use against HCMV since the licensing of ganciclovir, and of these, the same viral genes are often targeted, reducing the usefulness of these drugs against resistant strains. An alternative approach is to target host genes essential for virus replication. Here we demonstrate that HCMV replication is highly dependent on levels of the amino acid asparagine and that knockdown of a critical enzyme involved in asparagine synthesis results in severe attenuation of virus replication. These results suggest that reducing asparagine levels through dietary restriction or chemotherapeutic treatment could limit HCMV replication in patients.
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Affiliation(s)
- Chen-Hsuin Lee
- Division of Infection and Immunity, The Roslin Institute, University of Edinburgh, Easter Bush, Midlothian, United Kingdom
| | - Samantha Griffiths
- Division of Infection and Pathway Medicine, University of Edinburgh, Edinburgh, United Kingdom
| | - Paul Digard
- Division of Infection and Immunity, The Roslin Institute, University of Edinburgh, Easter Bush, Midlothian, United Kingdom
| | - Nhan Pham
- MRC Centre for Regenerative Medicine, Institute for Stem Cell Research, School of Biological Sciences, University of Edinburgh, Edinburgh, United Kingdom
| | - Manfred Auer
- MRC Centre for Regenerative Medicine, Institute for Stem Cell Research, School of Biological Sciences, University of Edinburgh, Edinburgh, United Kingdom
| | - Juergen Haas
- Division of Infection and Pathway Medicine, University of Edinburgh, Edinburgh, United Kingdom
| | - Finn Grey
- Division of Infection and Immunity, The Roslin Institute, University of Edinburgh, Easter Bush, Midlothian, United Kingdom
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30
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Carissimo G, Chan YH, Utt A, Chua TK, Bakar FA, Merits A, Ng LFP. VCP/p97 Is a Proviral Host Factor for Replication of Chikungunya Virus and Other Alphaviruses. Front Microbiol 2019; 10:2236. [PMID: 31636613 PMCID: PMC6787436 DOI: 10.3389/fmicb.2019.02236] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Accepted: 09/11/2019] [Indexed: 12/15/2022] Open
Abstract
The evolutionarily conserved AAA+ ATPase valosin-containing protein (VCP) was previously shown to be a proviral host factor for several viruses from different viral families such as Flaviviridae, Picornaviridae, and Herpesviridae. VCP was shown to affect trafficking of Sindbis virus receptor and functions as a component of Semliki Forest virus (SFV) replicase compartment. However, the role of this cellular protein was not evaluated during replication of alphaviruses including chikungunya virus (CHIKV). Using siRNA, chemical inhibitors, and trans-replication assays, we show here that VCP is a proviral factor involved in the replication of CHIKV. Immunofluorescence assays confirmed that VCP co-localized with non-structural replicase proteins but not with dsRNA foci possibly due to VCP epitope unavailability. VCP pro-viral role is also observed with other alphaviruses such as o’nyong’nyong virus (ONNV) and SFV in different human cell lines. VCP proviral roles on several viral families now extend to replication of alphaviruses CHIKV and ONNV, emphasizing the pivotal role of VCP in virus–host interaction biology.
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Affiliation(s)
- Guillaume Carissimo
- Singapore Immunology Network, Agency for Science, Technology and Research (A∗STAR), Singapore, Singapore
| | - Yi-Hao Chan
- Singapore Immunology Network, Agency for Science, Technology and Research (A∗STAR), Singapore, Singapore.,NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore, Singapore
| | - Age Utt
- Institute of Technology, Faculty of Science and Technology, University of Tartu, Tartu, Estonia
| | - Tze-Kwang Chua
- Singapore Immunology Network, Agency for Science, Technology and Research (A∗STAR), Singapore, Singapore
| | - Farhana Abu Bakar
- Singapore Immunology Network, Agency for Science, Technology and Research (A∗STAR), Singapore, Singapore.,School of Biological Sciences, College of Science, Nanyang Technological University, Singapore, Singapore
| | - Andres Merits
- Institute of Technology, Faculty of Science and Technology, University of Tartu, Tartu, Estonia
| | - Lisa F P Ng
- Singapore Immunology Network, Agency for Science, Technology and Research (A∗STAR), Singapore, Singapore.,Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.,Institute of Infection and Global Health, University of Liverpool, Liverpool, United Kingdom
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31
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Bègue H, Mounier A, Rosnoblet C, Wendehenne D. Toward the understanding of the role of CDC48, a major component of the protein quality control, in plant immunity. Plant Sci 2019; 279:34-44. [PMID: 30709491 DOI: 10.1016/j.plantsci.2018.10.029] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 10/29/2018] [Accepted: 10/31/2018] [Indexed: 06/09/2023]
Abstract
The evolutionally conserved chaperone-like protein CDC48 (cell division cycle 48) is a major component of ubiquitin-dependent protein degradation pathways in animal and yeast and, more generally, of the protein quality control machinery. In plants, CDC48 plays essential regulatory functions in development and the possibly that it contributes to protein degradation through the ubiquitin-proteasome system (UPS) and the endoplasmic reticulum-associated protein degradation (ERAD) system has been reported. In this review we described recent findings highlighting a role for CDC48 in plant immunity. First data indicated that CDC48 is S-nitrosylated in plant cells undergoing an immune response, regulates the turnover of immune receptors and mediates the degradation of viral proteins. Furthermore its overexpression was associated to an exacerbated hypersensitive-like cell death. We also designed and reported here the first CDC48 interactome. The corresponding data confirm the closed interaction of CDC48 with components of the UPS and shed light on its putative regulatory function of S-adenosyl-methionine synthesis and metabolism. More generally, these investigations further support the concept that plant cells facing pathogen attack finely regulate the protein quality control machinery.
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Affiliation(s)
- Hervé Bègue
- Agroécologie, AgroSup Dijon, CNRS, INRA, Univ. Bourgogne, Univ. Bourgogne Franche-Comté, F-21000, Dijon, France.
| | - Arnaud Mounier
- Agroécologie, AgroSup Dijon, CNRS, INRA, Univ. Bourgogne, Univ. Bourgogne Franche-Comté, F-21000, Dijon, France
| | - Claire Rosnoblet
- Agroécologie, AgroSup Dijon, CNRS, INRA, Univ. Bourgogne, Univ. Bourgogne Franche-Comté, F-21000, Dijon, France
| | - David Wendehenne
- Agroécologie, AgroSup Dijon, CNRS, INRA, Univ. Bourgogne, Univ. Bourgogne Franche-Comté, F-21000, Dijon, France.
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32
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Strang BL, Asquith CRM, Moshrif HF, Ho CMK, Zuercher WJ, Al-Ali H. Identification of lead anti-human cytomegalovirus compounds targeting MAP4K4 via machine learning analysis of kinase inhibitor screening data. PLoS One 2018; 13:e0201321. [PMID: 30048526 PMCID: PMC6062112 DOI: 10.1371/journal.pone.0201321] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 07/12/2018] [Indexed: 01/29/2023] Open
Abstract
Chemogenomic approaches involving highly annotated compound sets and cell based high throughput screening are emerging as a means to identify novel drug targets. We have previously screened a collection of highly characterized kinase inhibitors (Khan et al., Journal of General Virology, 2016) to identify compounds that increase or decrease expression of a human cytomegalovirus (HCMV) protein in infected cells. To identify potential novel anti-HCMV drug targets we used a machine learning approach to relate our phenotypic data from the aforementioned screen to kinase inhibition profiling of compounds used in this screen. Several of the potential targets had no previously reported role in HCMV replication. We focused on one potential anti-HCMV target, MAPK4K, and identified lead compounds inhibiting MAP4K4 that have anti-HCMV activity with little cellular cytotoxicity. We found that treatment of HCMV infected cells with inhibitors of MAP4K4, or an siRNA that inhibited MAP4K4 production, reduced HCMV replication and impaired detection of IE2-60, a viral protein necessary for efficient HCMV replication. Our findings demonstrate the potential of this machine learning approach to identify novel anti-viral drug targets, which can inform the discovery of novel anti-viral lead compounds.
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Affiliation(s)
- Blair L. Strang
- Institute for Infection & Immunity, St George’s, University of London, London, United Kingdom
| | - Christopher R. M. Asquith
- Structural Genomics Consortium, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Hanan F. Moshrif
- Institute for Infection & Immunity, St George’s, University of London, London, United Kingdom
| | - Catherine M-K Ho
- Institute for Infection & Immunity, St George’s, University of London, London, United Kingdom
| | - William J. Zuercher
- Structural Genomics Consortium, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Hassan Al-Ali
- Miami Project to Cure Paralysis, University of Miami, Miami, Florida, United States of America
- Department of Neurological Surgery, University of Miami, Miami, Florida, United States of America
- Sylvester Comprehensive Cancer Center, University of Miami, Miami, Florida, United States of America
- Katz Drug Discovery Center, University of Miami, Miami, Florida, United States of America
- Department of Medicine, University of Miami, Miami, Florida, United States of America
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33
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Lyupina YV, Erokhov PA, Kravchuk OI, Finoshin AD, Abaturova SB, Orlova OV, Beljelarskaya SN, Kostyuchenko MV, Mikhailov VS. Essential function of VCP/p97 in infection cycle of the nucleopolyhedrovirus AcMNPV in Spodoptera frugiperda Sf9 cells. Virus Res 2018; 253:68-76. [PMID: 29890203 DOI: 10.1016/j.virusres.2018.06.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2018] [Revised: 06/04/2018] [Accepted: 06/07/2018] [Indexed: 02/06/2023]
Abstract
The protein VCP/p97 (also named CDC48 and TER94) belongs to a type II subfamily of the AAA+ATPases and controls cellular proteostasis by acting upstream of proteasomes in the ubiquitin-proteasome protein degradation pathway. The function of VCP/p97 in the baculovirus infection cycle in insect cells remains unknown. Here, we identified VCP/p97 in the fall armyworm Spodoptera frugiperda (Sf9) cells and analyzed the replication of the Autographa californica multiple nucleopolyhedrovirus, AcMNPV, in Sf9 cells in which the VCP/p97 function was inhibited. The specific allosteric inhibitor of the VCP/p97 ATPase activity, NMS-873, did not deplete VCP/p97 in infected cells but caused a dose-dependent inhibition of viral DNA synthesis and efficiently suppressed expression of viral proteins and production of budded virions. NMS-873 caused accumulation of ubiquitinated proteins in a manner similar to the inhibitor of proteasome activity, Bortezomib. This suggests the essential function of VCP/p97 in the baculovirus infection cycle might be associated, at least in part, with the ubiquitin-proteasome system.
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Affiliation(s)
- Yulia V Lyupina
- N.K. Koltzov Institute of Developmental Biology, Russian Academy of Sciences, 26 Vavilova Str., Moscow, 119334, Russia
| | - Pavel A Erokhov
- N.K. Koltzov Institute of Developmental Biology, Russian Academy of Sciences, 26 Vavilova Str., Moscow, 119334, Russia
| | - Oksana I Kravchuk
- N.K. Koltzov Institute of Developmental Biology, Russian Academy of Sciences, 26 Vavilova Str., Moscow, 119334, Russia
| | - Alexander D Finoshin
- N.K. Koltzov Institute of Developmental Biology, Russian Academy of Sciences, 26 Vavilova Str., Moscow, 119334, Russia
| | - Svetlana B Abaturova
- N.K. Koltzov Institute of Developmental Biology, Russian Academy of Sciences, 26 Vavilova Str., Moscow, 119334, Russia
| | - Olga V Orlova
- V.A. Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, 32 Vavilova Str., Moscow, 119334, Russia
| | - Svetlana N Beljelarskaya
- V.A. Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, 32 Vavilova Str., Moscow, 119334, Russia
| | - Margarita V Kostyuchenko
- Institute of Gene Biology, Russian Academy of Sciences, 34/5 Vavilova Str., Moscow, 119334, Russia
| | - Victor S Mikhailov
- N.K. Koltzov Institute of Developmental Biology, Russian Academy of Sciences, 26 Vavilova Str., Moscow, 119334, Russia.
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Møller R, Schwarz TM, Noriega VM, Panis M, Sachs D, Tortorella D, tenOever BR. miRNA-mediated targeting of human cytomegalovirus reveals biological host and viral targets of IE2. Proc Natl Acad Sci U S A 2018; 115:1069-74. [PMID: 29339472 DOI: 10.1073/pnas.1719036115] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Human cytomegalovirus (HCMV) impacts more than one-half of the human population owing to its capacity to manipulate the cell and create latent reservoirs in the host. Despite an extensive understanding of HCMV biology during acute infection in fibroblasts, the molecular basis for latency in myeloid cells remains incomplete. This knowledge gap is due largely to the fact that the existing genetic systems require virus rescue in fibroblasts, precluding the study of genes that are essential during acute infection, yet likely play unique roles in myeloid cells or the establishment of latency. Here we present a solution to address this restriction. Through the exploitation of a hematopoietic-specific microRNA, we demonstrate a one-step recombineering approach that enables gene silencing only in cells associated with latency. As a proof of concept, here we describe a TB40/E variant that undergoes hematopoietic targeting of the Immediate Early-2 (IE2) gene to explore its function during infection of myeloid cells. While virus replication of the hematopoietic-targeted IE2 variant was unimpaired in fibroblasts, we observed a >100-fold increase in virus titers in myeloid cells. Virus replication in myeloid cells demonstrated that IE2 has a significant transcriptional footprint on both viral and host genes. These data implicate IE2 as an essential mediator of virus biology in myeloid cells and illustrate the utility of cell-specific microRNA-based targeting.
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