1
|
Falke S, Lieske J, Herrmann A, Loboda J, Karničar K, Günther S, Reinke PYA, Ewert W, Usenik A, Lindič N, Sekirnik A, Dretnik K, Tsuge H, Turk V, Chapman HN, Hinrichs W, Ebert G, Turk D, Meents A. Structural Elucidation and Antiviral Activity of Covalent Cathepsin L Inhibitors. J Med Chem 2024; 67:7048-7067. [PMID: 38630165 PMCID: PMC11089505 DOI: 10.1021/acs.jmedchem.3c02351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 03/22/2024] [Accepted: 03/28/2024] [Indexed: 05/15/2024]
Abstract
Emerging RNA viruses, including SARS-CoV-2, continue to be a major threat. Cell entry of SARS-CoV-2 particles via the endosomal pathway involves cysteine cathepsins. Due to ubiquitous expression, cathepsin L (CatL) is considered a promising drug target in the context of different viral and lysosome-related diseases. We characterized the anti-SARS-CoV-2 activity of a set of carbonyl- and succinyl epoxide-based inhibitors, which were previously identified as inhibitors of cathepsins or related cysteine proteases. Calpain inhibitor XII, MG-101, and CatL inhibitor IV possess antiviral activity in the very low nanomolar EC50 range in Vero E6 cells and inhibit CatL in the picomolar Ki range. We show a relevant off-target effect of CatL inhibition by the coronavirus main protease α-ketoamide inhibitor 13b. Crystal structures of CatL in complex with 14 compounds at resolutions better than 2 Å present a solid basis for structure-guided understanding and optimization of CatL inhibitors toward protease drug development.
Collapse
Affiliation(s)
- Sven Falke
- Center
for Free-Electron Laser Science CFEL, Deutsches
Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Julia Lieske
- Center
for Free-Electron Laser Science CFEL, Deutsches
Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Alexander Herrmann
- Institute
of Virology, Helmholtz Munich, Ingolstädter Landstraße 1, 85764 Neuherberg, Munich, Germany
| | - Jure Loboda
- Department
of Biochemistry and Molecular and Structural Biology, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
| | - Katarina Karničar
- Department
of Biochemistry and Molecular and Structural Biology, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
- Centre
of Excellence for Integrated Approaches in Chemistry and Biology of
Proteins, Jamova 39, 1000 Ljubljana, Slovenia
| | - Sebastian Günther
- Center
for Free-Electron Laser Science CFEL, Deutsches
Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Patrick Y. A. Reinke
- Center
for Free-Electron Laser Science CFEL, Deutsches
Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Wiebke Ewert
- Center
for Free-Electron Laser Science CFEL, Deutsches
Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Aleksandra Usenik
- Department
of Biochemistry and Molecular and Structural Biology, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
- Centre
of Excellence for Integrated Approaches in Chemistry and Biology of
Proteins, Jamova 39, 1000 Ljubljana, Slovenia
| | - Nataša Lindič
- Department
of Biochemistry and Molecular and Structural Biology, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
| | - Andreja Sekirnik
- Department
of Biochemistry and Molecular and Structural Biology, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
| | - Klemen Dretnik
- Department
of Biochemistry and Molecular and Structural Biology, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
- The
Jožef Stefan International Postgraduate School, Jamova cesta 39, 1000 Ljubljana, Slovenia
| | - Hideaki Tsuge
- Faculty of
Life Sciences, Kyoto Sangyo University, Kyoto 603-8555, Japan
| | - Vito Turk
- Department
of Biochemistry and Molecular and Structural Biology, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
| | - Henry N. Chapman
- Center
for Free-Electron Laser Science CFEL, Deutsches
Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Hamburg
Centre for Ultrafast Imaging, Universität
Hamburg, Luruper Chaussee
149, 22761 Hamburg, Germany
- Department
of Physics, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - Winfried Hinrichs
- Institute
of Biochemistry, Universität Greifswald, Felix-Hausdorff-Str. 4, 17489 Greifswald, Germany
| | - Gregor Ebert
- Institute
of Virology, Helmholtz Munich, Ingolstädter Landstraße 1, 85764 Neuherberg, Munich, Germany
- Institute
of Virology, Technical University of Munich, Trogerstraße 30, 81675 Munich, Germany
| | - Dušan Turk
- Department
of Biochemistry and Molecular and Structural Biology, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
- Centre
of Excellence for Integrated Approaches in Chemistry and Biology of
Proteins, Jamova 39, 1000 Ljubljana, Slovenia
| | - Alke Meents
- Center
for Free-Electron Laser Science CFEL, Deutsches
Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| |
Collapse
|
2
|
Wang Z, McCallum M, Yan L, Gibson CA, Sharkey W, Park YJ, Dang HV, Amaya M, Person A, Broder CC, Veesler D. Structure and design of Langya virus glycoprotein antigens. Proc Natl Acad Sci U S A 2024; 121:e2314990121. [PMID: 38593070 PMCID: PMC11032465 DOI: 10.1073/pnas.2314990121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Accepted: 03/04/2024] [Indexed: 04/11/2024] Open
Abstract
Langya virus (LayV) is a recently discovered henipavirus (HNV), isolated from febrile patients in China. HNV entry into host cells is mediated by the attachment (G) and fusion (F) glycoproteins which are the main targets of neutralizing antibodies. We show here that the LayV F and G glycoproteins promote membrane fusion with human, mouse, and hamster target cells using a different, yet unknown, receptor than Nipah virus (NiV) and Hendra virus (HeV) and that NiV- and HeV-elicited monoclonal and polyclonal antibodies do not cross-react with LayV F and G. We determined cryoelectron microscopy structures of LayV F, in the prefusion and postfusion states, and of LayV G, revealing their conformational landscape and distinct antigenicity relative to NiV and HeV. We computationally designed stabilized LayV G constructs and demonstrate the generalizability of an HNV F prefusion-stabilization strategy. Our data will support the development of vaccines and therapeutics against LayV and closely related HNVs.
Collapse
Affiliation(s)
- Zhaoqian Wang
- Department of Biochemistry, University of Washington, Seattle, WA98195
| | - Matthew McCallum
- Department of Biochemistry, University of Washington, Seattle, WA98195
| | - Lianying Yan
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD20814
| | - Cecily A. Gibson
- Department of Biochemistry, University of Washington, Seattle, WA98195
| | - William Sharkey
- Department of Biochemistry, University of Washington, Seattle, WA98195
| | - Young-Jun Park
- Department of Biochemistry, University of Washington, Seattle, WA98195
- HHMI, Seattle, WA98195
| | - Ha V. Dang
- Department of Biochemistry, University of Washington, Seattle, WA98195
| | - Moushimi Amaya
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD20814
| | - Ashley Person
- Department of Biochemistry, University of Washington, Seattle, WA98195
| | - Christopher C. Broder
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD20814
| | - David Veesler
- Department of Biochemistry, University of Washington, Seattle, WA98195
- HHMI, Seattle, WA98195
| |
Collapse
|
3
|
Zeitlin L, Cross RW, Woolsey C, West BR, Borisevich V, Agans KN, Prasad AN, Deer DJ, Stuart L, McCavitt-Malvido M, Kim DH, Pettitt J, Crowe JE, Whaley KJ, Veesler D, Dimitrov A, Abelson DM, Geisbert TW, Broder CC. Therapeutic administration of a cross-reactive mAb targeting the fusion glycoprotein of Nipah virus protects nonhuman primates. Sci Transl Med 2024; 16:eadl2055. [PMID: 38569014 DOI: 10.1126/scitranslmed.adl2055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Accepted: 03/03/2024] [Indexed: 04/05/2024]
Abstract
No licensed vaccines or therapies exist for patients infected with Nipah virus (NiV), although an experimental human monoclonal antibody (mAb) cross-reactive to the NiV and Hendra virus (HeV) G glycoprotein, m102.4, has been tested in a phase 1 trial and has been provided under compassionate use for both HeV and NiV exposures. NiV is a highly pathogenic zoonotic paramyxovirus causing regular outbreaks in humans and animals in South and Southeast Asia. The mortality rate of NiV infection in humans ranges from 40% to more than 90%, making it a substantial public health concern. The NiV G glycoprotein mediates host cell attachment, and the F glycoprotein facilitates membrane fusion and infection. We hypothesized that a mAb against the prefusion conformation of the F glycoprotein may confer better protection than m102.4. To test this, two potent neutralizing mAbs against NiV F protein, hu1F5 and hu12B2, were compared in a hamster model. Hu1F5 provided superior protection to hu12B2 and was selected for comparison with m102.4 for the ability to protect African green monkeys (AGMs) from a stringent NiV challenge. AGMs were exposed intranasally to the Bangladesh strain of NiV and treated 5 days after exposure with either mAb (25 milligrams per kilogram). Whereas only one of six AGMs treated with m102.4 survived until the study end point, all six AGMs treated with hu1F5 were protected. Furthermore, a reduced 10 milligrams per kilogram dose of hu1F5 also provided complete protection against NiV challenge, supporting the upcoming clinical advancement of this mAb for postexposure prophylaxis and therapy.
Collapse
Affiliation(s)
| | - Robert W Cross
- Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston National Laboratory, Galveston, TX 77550, USA
| | - Courtney Woolsey
- Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston National Laboratory, Galveston, TX 77550, USA
| | | | - Viktoriya Borisevich
- Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston National Laboratory, Galveston, TX 77550, USA
| | - Krystle N Agans
- Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston National Laboratory, Galveston, TX 77550, USA
| | - Abhishek N Prasad
- Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston National Laboratory, Galveston, TX 77550, USA
| | - Daniel J Deer
- Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston National Laboratory, Galveston, TX 77550, USA
| | | | | | - Do H Kim
- Mapp Biopharmaceutical, San Diego, CA 92121, USA
| | | | - James E Crowe
- Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
- Vanderbilt Vaccine Center, Vanderbilt University Medical Center, Nashville, TN 37232, USA
- Department of Pediatrics, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | | | - David Veesler
- Department of Biochemistry, University of Washington, Seattle, WA 98195, USA
- Howard Hughes Medical Institute, Seattle, WA 98195, USA
| | - Antony Dimitrov
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD 20814, USA
- Henry M. Jackson Foundation for the Advancement of Military Medicine Inc., Bethesda, MD 20814, USA
| | | | - Thomas W Geisbert
- Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston National Laboratory, Galveston, TX 77550, USA
| | - Christopher C Broder
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD 20814, USA
| |
Collapse
|
4
|
Chen Y, Zhu S, Liao T, Wang C, Han J, Yang Z, Lu X, Hu Z, Hu J, Wang X, Gu M, Gao R, Liu K, Liu X, Ding C, Hu S, Liu X. The HN protein of Newcastle disease virus induces cell apoptosis through the induction of lysosomal membrane permeabilization. PLoS Pathog 2024; 20:e1011981. [PMID: 38354122 PMCID: PMC10866534 DOI: 10.1371/journal.ppat.1011981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Accepted: 01/17/2024] [Indexed: 02/16/2024] Open
Abstract
Lysosomes are acidic organelles that mediate the degradation and recycling of cellular waste materials. Damage to lysosomes can cause lysosomal membrane permeabilization (LMP) and trigger different types of cell death, including apoptosis. Newcastle disease virus (NDV) can naturally infect most birds. Additionally, it serves as a promising oncolytic virus known for its effective infection of tumor cells and induction of intensive apoptotic responses. However, the involvement of lysosomes in NDV-induced apoptosis remains poorly understood. Here, we demonstrate that NDV infection profoundly triggers LMP, leading to the translocation of cathepsin B and D and subsequent mitochondria-dependent apoptosis in various tumor and avian cells. Notably, the released cathepsin B and D exacerbate NDV-induced LMP by inducing the generation of reactive oxygen species. Additionally, we uncover that the viral Hemagglutinin neuraminidase (HN) protein induces the deglycosylation and degradation of lysosome-associated membrane protein 1 (LAMP1) and LAMP2 dependent on its sialidase activity, which finally contributes to NDV-induced LMP and cellular apoptosis. Overall, our findings elucidate the role of LMP in NDV-induced cell apoptosis and provide novel insights into the function of HN during NDV-induced LMP, which provide innovative approaches for the development of NDV-based oncolytic agents.
Collapse
Affiliation(s)
- Yu Chen
- Animal Infectious Disease Laboratory, College of Veterinary Medicine, Yangzhou University; Yangzhou, Jiangsu, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou, China
| | - Shanshan Zhu
- Animal Infectious Disease Laboratory, College of Veterinary Medicine, Yangzhou University; Yangzhou, Jiangsu, China
| | - Tianxing Liao
- Animal Infectious Disease Laboratory, College of Veterinary Medicine, Yangzhou University; Yangzhou, Jiangsu, China
| | - Chunxuan Wang
- Animal Infectious Disease Laboratory, College of Veterinary Medicine, Yangzhou University; Yangzhou, Jiangsu, China
| | - Jiajun Han
- Animal Infectious Disease Laboratory, College of Veterinary Medicine, Yangzhou University; Yangzhou, Jiangsu, China
| | - Zhenyu Yang
- Animal Infectious Disease Laboratory, College of Veterinary Medicine, Yangzhou University; Yangzhou, Jiangsu, China
| | - Xiaolong Lu
- Animal Infectious Disease Laboratory, College of Veterinary Medicine, Yangzhou University; Yangzhou, Jiangsu, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou, China
| | - Zenglei Hu
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, China
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, China
| | - Jiao Hu
- Animal Infectious Disease Laboratory, College of Veterinary Medicine, Yangzhou University; Yangzhou, Jiangsu, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou, China
| | - Xiaoquan Wang
- Animal Infectious Disease Laboratory, College of Veterinary Medicine, Yangzhou University; Yangzhou, Jiangsu, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou, China
| | - Min Gu
- Animal Infectious Disease Laboratory, College of Veterinary Medicine, Yangzhou University; Yangzhou, Jiangsu, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou, China
| | - Ruyi Gao
- Animal Infectious Disease Laboratory, College of Veterinary Medicine, Yangzhou University; Yangzhou, Jiangsu, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou, China
| | - Kaituo Liu
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, China
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, China
| | - Xiaowen Liu
- Animal Infectious Disease Laboratory, College of Veterinary Medicine, Yangzhou University; Yangzhou, Jiangsu, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou, China
| | - Chan Ding
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, China
- Department of Avian Infectious Diseases, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China
| | - Shunlin Hu
- Animal Infectious Disease Laboratory, College of Veterinary Medicine, Yangzhou University; Yangzhou, Jiangsu, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou, China
| | - Xiufan Liu
- Animal Infectious Disease Laboratory, College of Veterinary Medicine, Yangzhou University; Yangzhou, Jiangsu, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou, China
| |
Collapse
|
5
|
Diederich S, Babiuk S, Boshra H. A Survey of Henipavirus Tropism-Our Current Understanding from a Species/Organ and Cellular Level. Viruses 2023; 15:2048. [PMID: 37896825 PMCID: PMC10611353 DOI: 10.3390/v15102048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 09/22/2023] [Accepted: 09/29/2023] [Indexed: 10/29/2023] Open
Abstract
Henipaviruses are single-stranded RNA viruses that have been shown to be virulent in several species, including humans, pigs, horses, and rodents. Isolated nearly 30 years ago, these viruses have been shown to be of particular concern to public health, as at least two members (Nipah and Hendra viruses) are highly virulent, as well as zoonotic, and are thus classified as BSL4 pathogens. Although only 5 members of this genus have been isolated and characterized, metagenomics analysis using animal fluids and tissues has demonstrated the existence of other novel henipaviruses, suggesting a far greater degree of phylogenetic diversity than is currently known. Using a variety of molecular biology techniques, it has been shown that these viruses exhibit varying degrees of tropism on a species, organ/tissue, and cellular level. This review will attempt to provide a general overview of our current understanding of henipaviruses, with a particular emphasis on viral tropism.
Collapse
Affiliation(s)
- Sandra Diederich
- Institute of Novel and Emerging Infectious Diseases, Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, 17493 Greifswald, Germany;
| | - Shawn Babiuk
- Canadian Food Inspection Agency, National Centre for Foreign Animal Disease, Winnipeg, MB R3E EM4, Canada;
| | - Hani Boshra
- Global Urgent and Advanced Research and Development (GUARD), 911 rue Principale, Batiscan, QC G0X 1A0, Canada
| |
Collapse
|
6
|
Wang Z, McCallum M, Yan L, Sharkey W, Park YJ, Dang HV, Amaya M, Person A, Broder CC, Veesler D. Structure and design of Langya virus glycoprotein antigens. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.08.20.554025. [PMID: 37645760 PMCID: PMC10462157 DOI: 10.1101/2023.08.20.554025] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/31/2023]
Abstract
Langya virus (LayV) is a recently discovered henipavirus (HNV), isolated from febrile patients in China. HNV entry into host cells is mediated by the attachment (G) and fusion (F) glycoproteins which are the main targets of neutralizing antibodies. We show here that the LayV F and G glycoproteins promote membrane fusion with human, mouse and hamster target cells using a different, yet unknown, receptor than NiV and HeV and that NiV- and HeV-elicited monoclonal and polyclonal antibodies do not cross-react with LayV F and G. We determined cryo-electron microscopy structures of LayV F, in the prefusion and postfusion states, and of LayV G, revealing previously unknown conformational landscapes and their distinct antigenicity relative to NiV and HeV. We computationally designed stabilized LayV G constructs and demonstrate the generalizability of an HNV F prefusion-stabilization strategy. Our data will support the development of vaccines and therapeutics against LayV and closely related HNVs.
Collapse
Affiliation(s)
- Zhaoqian Wang
- Department of Biochemistry, University of Washington, Seattle, Washington, USA
| | - Matthew McCallum
- Department of Biochemistry, University of Washington, Seattle, Washington, USA
| | - Lianying Yan
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, Maryland, USA
| | - William Sharkey
- Department of Biochemistry, University of Washington, Seattle, Washington, USA
| | - Young-Jun Park
- Department of Biochemistry, University of Washington, Seattle, Washington, USA
- Howard Hughes Medical Institute, Seattle, WA 98195, USA
| | - Ha V. Dang
- Department of Biochemistry, University of Washington, Seattle, Washington, USA
| | - Moushimi Amaya
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, Maryland, USA
| | - Ashley Person
- Department of Biochemistry, University of Washington, Seattle, Washington, USA
| | - Christopher C. Broder
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, Maryland, USA
| | - David Veesler
- Department of Biochemistry, University of Washington, Seattle, Washington, USA
- Howard Hughes Medical Institute, Seattle, WA 98195, USA
| |
Collapse
|
7
|
May AJ, Pothula KR, Janowska K, Acharya P. Structures of Langya Virus Fusion Protein Ectodomain in Pre- and Postfusion Conformation. J Virol 2023; 97:e0043323. [PMID: 37278642 PMCID: PMC10308951 DOI: 10.1128/jvi.00433-23] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Accepted: 05/13/2023] [Indexed: 06/07/2023] Open
Abstract
Langya virus (LayV) is a paramyxovirus in the Henipavirus genus, closely related to the deadly Nipah (NiV) and Hendra (HeV) viruses, that was identified in August 2022 through disease surveillance following animal exposure in eastern China. Paramyxoviruses present two glycoproteins on their surface, known as attachment and fusion proteins, that mediate entry into cells and constitute the primary antigenic targets for immune response. Here, we determine cryo-electron microscopy (cryo-EM) structures of the uncleaved LayV fusion protein (F) ectodomain in pre- and postfusion conformations. The LayV-F protein exhibits pre- and postfusion architectures that, despite being highly conserved across paramyxoviruses, show differences in their surface properties, in particular at the apex of the prefusion trimer, that may contribute to antigenic variability. While dramatic conformational changes were visualized between the pre- and postfusion forms of the LayV-F protein, several domains remained invariant, held together by highly conserved disulfides. The LayV-F fusion peptide (FP) is buried within a highly conserved, hydrophobic interprotomer pocket in the prefusion state and is notably less flexible than the rest of the protein, highlighting its "spring-loaded" state and suggesting that the mechanism of pre-to-post transition must involve perturbations to the pocket and release of the fusion peptide. Together, these results offer a structural basis for how the Langya virus fusion protein compares to its Henipavirus relatives and propose a mechanism for the initial step of pre- to postfusion conversion that may apply more broadly to paramyxoviruses. IMPORTANCE The Henipavirus genus is quickly expanding into new animal hosts and geographic locations. This study compares the structure and antigenicity of the Langya virus fusion protein to other henipaviruses, which have important vaccine and therapeutic development implications. Furthermore, the study proposes a new mechanism to explain the early steps of the fusion initiation process that can be more broadly applied to the Paramyxoviridae family.
Collapse
Affiliation(s)
- Aaron J. May
- Duke Human Vaccine Institute, Durham, North Carolina, USA
- Duke University, Department of Biochemistry, Durham, North Carolina, USA
| | | | | | - Priyamvada Acharya
- Duke Human Vaccine Institute, Durham, North Carolina, USA
- Duke University, Department of Biochemistry, Durham, North Carolina, USA
- Duke University, Department of Surgery, Durham, North Carolina, USA
| |
Collapse
|
8
|
Isaacs A, Low YS, Macauslane KL, Seitanidou J, Pegg CL, Cheung STM, Liang B, Scott CAP, Landsberg MJ, Schulz BL, Chappell KJ, Modhiran N, Watterson D. Structure and antigenicity of divergent Henipavirus fusion glycoproteins. Nat Commun 2023; 14:3577. [PMID: 37328468 PMCID: PMC10275869 DOI: 10.1038/s41467-023-39278-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Accepted: 06/02/2023] [Indexed: 06/18/2023] Open
Abstract
In August 2022, a novel henipavirus (HNV) named Langya virus (LayV) was isolated from patients with severe pneumonic disease in China. This virus is closely related to Mòjiāng virus (MojV), and both are divergent from the bat-borne HNV members, Nipah (NiV) and Hendra (HeV) viruses. The spillover of LayV is the first instance of a HNV zoonosis to humans outside of NiV and HeV, highlighting the continuing threat this genus poses to human health. In this work, we determine the prefusion structures of MojV and LayV F proteins via cryogenic electron microscopy to 2.66 and 3.37 Å, respectively. We show that despite sequence divergence from NiV, the F proteins adopt an overall similar structure but are antigenically distinct as they do not react to known antibodies or sera. Glycoproteomic analysis revealed that while LayV F is less glycosylated than NiV F, it contains a glycan that shields a site of vulnerability previously identified for NiV. These findings explain the distinct antigenic profile of LayV and MojV F, despite the extent to which they are otherwise structurally similar to NiV. Our results carry implications for broad-spectrum HNV vaccines and therapeutics, and indicate an antigenic, yet not structural, divergence from prototypical HNVs.
Collapse
Affiliation(s)
- Ariel Isaacs
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia
| | - Yu Shang Low
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia
| | - Kyle L Macauslane
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia
| | - Joy Seitanidou
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia
| | - Cassandra L Pegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia
| | - Stacey T M Cheung
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia
| | - Benjamin Liang
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia
| | - Connor A P Scott
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia
| | - Michael J Landsberg
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia
- Australian Infectious Disease Research Centre, The University of Queensland, Brisbane, Australia
| | - Benjamin L Schulz
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia
- Australian Infectious Disease Research Centre, The University of Queensland, Brisbane, Australia
| | - Keith J Chappell
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia
- Australian Infectious Disease Research Centre, The University of Queensland, Brisbane, Australia
- Australian Institute for Bioengineering and Nanotechnology, Brisbane, Australia
| | - Naphak Modhiran
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia.
| | - Daniel Watterson
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia.
- Australian Infectious Disease Research Centre, The University of Queensland, Brisbane, Australia.
| |
Collapse
|
9
|
Zabiegala A, Kim Y, Chang KO. Roles of host proteases in the entry of SARS-CoV-2. ANIMAL DISEASES 2023; 3:12. [PMID: 37128508 PMCID: PMC10125864 DOI: 10.1186/s44149-023-00075-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Accepted: 03/07/2023] [Indexed: 05/03/2023] Open
Abstract
The spike protein (S) of SARS-CoV-2 is responsible for viral attachment and entry, thus a major factor for host susceptibility, tissue tropism, virulence and pathogenicity. The S is divided with S1 and S2 region, and the S1 contains the receptor-binding domain (RBD), while the S2 contains the hydrophobic fusion domain for the entry into the host cell. Numerous host proteases have been implicated in the activation of SARS-CoV-2 S through various cleavage sites. In this article, we review host proteases including furin, trypsin, transmembrane protease serine 2 (TMPRSS2) and cathepsins in the activation of SARS-CoV-2 S. Many betacoronaviruses including SARS-CoV-2 have polybasic residues at the S1/S2 site which is subjected to the cleavage by furin. The S1/S2 cleavage facilitates more assessable RBD to the receptor ACE2, and the binding triggers further conformational changes and exposure of the S2' site to proteases such as type II transmembrane serine proteases (TTPRs) including TMPRSS2. In the presence of TMPRSS2 on the target cells, SARS-CoV-2 can utilize a direct entry route by fusion of the viral envelope to the cellular membrane. In the absence of TMPRSS2, SARS-CoV-2 enter target cells via endosomes where multiple cathepsins cleave the S for the successful entry. Additional host proteases involved in the cleavage of the S were discussed. This article also includes roles of 3C-like protease inhibitors which have inhibitory activity against cathepsin L in the entry of SARS-CoV-2, and discussed the dual roles of such inhibitors in virus replication.
Collapse
Affiliation(s)
- Alexandria Zabiegala
- Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State University, 1800 Denison Avenue, Manhattan, KS 66506 USA
| | - Yunjeong Kim
- Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State University, 1800 Denison Avenue, Manhattan, KS 66506 USA
| | - Kyeong-Ok Chang
- Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State University, 1800 Denison Avenue, Manhattan, KS 66506 USA
| |
Collapse
|
10
|
Heindl MR, Böttcher-Friebertshäuser E. The role of influenza-A virus and coronavirus viral glycoprotein cleavage in host adaptation. Curr Opin Virol 2023; 58:101303. [PMID: 36753938 PMCID: PMC9847222 DOI: 10.1016/j.coviro.2023.101303] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 12/15/2022] [Accepted: 12/16/2022] [Indexed: 01/19/2023]
Abstract
While receptor binding is well recognized as a factor in influenza-A virus (IAV) and coronavirus (CoV) host adaptation, the role of viral glycoprotein cleavage has not been studied in detail so far. Interestingly, recent studies suggest that host species may differ in their protease repertoire available for cleavage. Furthermore, it was shown for certain bat-derived CoVs that proteolytic activation provides a critical barrier to infect human cells. Understanding the role of glycoprotein cleavage in different species and how IAV and CoVs adapt to a new protease repertoire may allow evaluating the zoonotic potential and risk posed by these viruses. Here, we summarize the current knowledge on the emergence of a multibasic cleavage site (CS) in the glycoproteins of IAVs and CoVs in different host species. Additionally, we discuss the role of transmembrane serine protease 2 (TMPRSS2) in virus activation and entry and a role of neuropilin-1 in acquisition of a multibasic CS in different hosts.
Collapse
|
11
|
Pseudotyped Virus for Henipavirus. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2023; 1407:175-190. [PMID: 36920697 DOI: 10.1007/978-981-99-0113-5_9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
Abstract
The genus Henipavirus (HNV) includes two virulent infectious viruses, Nipah virus (NiV) and Hendra virus (HeV), which are the focus of considerable public health research efforts and have been classified as priority infectious diseases by the World Health Organization. Both viruses are high risk and should be handled in biosafety level 4 laboratories. Pseudotyped viruses containing the envelope proteins of HNV viruses have the same envelope protein structure as the authentic viruses; thus, they can mimic the receptor-binding and membrane fusion processes of authentic viruses with host cells and can be handled in biosafety level 2 laboratories. These characteristics enable pseudotyped viruses to be widely used in studies of viral infection mechanisms (packaging, budding, virus attachment, membrane fusion, viral entry, and glycosylation), inhibitory drug screening assays, and monoclonal antibody neutralization characteristics. This review will provide an overview of the progress of research concerning pseudotyped virus packaging systems for NiV and HeV.
Collapse
|
12
|
Moumbock AFA, Tran HTT, Lamy E, Günther S. BC-11 is a covalent TMPRSS2 fragment inhibitor that impedes SARS-CoV-2 host cell entry. Arch Pharm (Weinheim) 2023; 356:e2200371. [PMID: 36316225 PMCID: PMC9874818 DOI: 10.1002/ardp.202200371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 10/04/2022] [Accepted: 10/07/2022] [Indexed: 11/07/2022]
Abstract
Host cell entry of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is facilitated via priming of its spike glycoprotein by the human transmembrane protease serine 2 (TMPRSS2). Although camostat and nafamostat are two highly potent covalent TMPRSS2 inhibitors, they nevertheless did not hold promise in COVID-19 clinical trials, presumably due to their short plasma half-lives. Herein, we report an integrative chemogenomics approach based on computational modeling and in vitro enzymatic assays, for repurposing serine-targeted covalent inhibitors. This led to the identification of BC-11 as a covalent TMPRSS2 inhibitor displaying a unique selectivity profile for serine proteases, ascribable to its boronic acid warhead. BC-11 showed modest inhibition of SARS-CoV-2 (omicron variant) spike pseudotyped particles in a cell-based entry assay, and a combination of BC-11 and AHN 1-055 (a spike glycoprotein inhibitor) demonstrated better viral entry inhibition than either compound alone. Given its low molecular weight and good activity against TMPRSS2, BC-11 qualifies as a good starting point for further structural optimizations.
Collapse
Affiliation(s)
- Aurélien F. A. Moumbock
- Faculty of Chemistry and Pharmacy, Institute of Pharmaceutical SciencesAlbert‐Ludwigs‐Universität FreiburgFreiburgGermany
| | - Hoai T. T. Tran
- Molecular Preventive Medicine, Faculty of MedicineUniversity Medical Center, Albert‐Ludwigs‐Universität FreiburgFreiburgGermany
| | - Evelyn Lamy
- Molecular Preventive Medicine, Faculty of MedicineUniversity Medical Center, Albert‐Ludwigs‐Universität FreiburgFreiburgGermany
| | - Stefan Günther
- Faculty of Chemistry and Pharmacy, Institute of Pharmaceutical SciencesAlbert‐Ludwigs‐Universität FreiburgFreiburgGermany
| |
Collapse
|
13
|
Gazal S, Sharma N, Gazal S, Tikoo M, Shikha D, Badroo GA, Rashid M, Lee SJ. Nipah and Hendra Viruses: Deadly Zoonotic Paramyxoviruses with the Potential to Cause the Next Pandemic. Pathogens 2022; 11:pathogens11121419. [PMID: 36558753 PMCID: PMC9784551 DOI: 10.3390/pathogens11121419] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Revised: 11/18/2022] [Accepted: 11/22/2022] [Indexed: 11/30/2022] Open
Abstract
Nipah and Hendra viruses are deadly zoonotic paramyxoviruses with a case fatality rate of upto 75%. The viruses belong to the genus henipavirus in the family Paramyxoviridae, a family of negative-sense single-stranded RNA viruses. The natural reservoirs of NiV and HeV are bats (flying foxes) in which the virus infection is asymptomatic. The intermediate hosts for NiV and HeV are swine and equine, respectively. In humans, NiV infections result in severe and often fatal respiratory and neurological manifestations. The Nipah virus was first identified in Malaysia and Singapore following an outbreak of encephalitis in pig farmers and subsequent outbreaks have been reported in Bangladesh and India almost every year. Due to its extreme pathogenicity, pandemic potential, and lack of established antiviral therapeutics and vaccines, research on henipaviruses is highly warranted so as to develop antivirals or vaccines that could aid in the prevention and control of future outbreaks.
Collapse
Affiliation(s)
- Sabahat Gazal
- Division of Veterinary Microbiology and Immunology, Faculty of Veterinary Science and Animal Husbandry, Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu, R.S. Pura, Jammu 181102, Jammu and Kashmir, India
| | - Neelesh Sharma
- Division of Veterinary Medicine, Faculty of Veterinary Science and Animal Husbandry, Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu, R.S. Pura, Jammu 181102, Jammu and Kashmir, India
- Correspondence: (N.S.); (S.-J.L.)
| | - Sundus Gazal
- Division of Veterinary Microbiology, College of Veterinary Sciences, Guru Angad Dev Veterinary and Animal Science University, Ludhiana 141004, Punjab, India
| | - Mehak Tikoo
- Division of Veterinary Microbiology and Immunology, Faculty of Veterinary Science and Animal Husbandry, Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu, R.S. Pura, Jammu 181102, Jammu and Kashmir, India
| | - Deep Shikha
- Division of Veterinary Microbiology and Immunology, Faculty of Veterinary Science and Animal Husbandry, Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu, R.S. Pura, Jammu 181102, Jammu and Kashmir, India
| | - Gulzar Ahmed Badroo
- Division of Veterinary Microbiology and Immunology, Faculty of Veterinary Science and Animal Husbandry, Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu, R.S. Pura, Jammu 181102, Jammu and Kashmir, India
| | - Mohd Rashid
- Division of Veterinary Microbiology and Immunology, Faculty of Veterinary Science and Animal Husbandry, Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu, R.S. Pura, Jammu 181102, Jammu and Kashmir, India
| | - Sung-Jin Lee
- Department of Applied Animal Science, College of Animal Life Sciences, Kangwon National University, Chuncheon 24341, Republic of Korea
- Correspondence: (N.S.); (S.-J.L.)
| |
Collapse
|
14
|
Siewiński M, Bażanów B, Orzechowska B, Gołąb K, Gburek J, Matkowski A, Rapak A, Janocha A, Krata L, Dobrzyński M, Kilar E. Use of natural cysteine protease inhibitors in limiting SARS-Co-2 fusion into human respiratory cells. Med Hypotheses 2022; 168:110965. [PMID: 36313266 PMCID: PMC9598048 DOI: 10.1016/j.mehy.2022.110965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 10/20/2022] [Indexed: 11/18/2022]
Abstract
Specific antibodies that humans acquire as a result of disease or after vaccination are needed to effectively suppress infection with a specific variant of SARS CoV-2 virus. The S protein of the D614G variant of coronavirus is used as an antigen in known vaccines to date. It is known that COVID-19 disease resulting from infection with this coronavirus can often be very dangerous to the health and lives of patients. In contrast, vaccines produce antibodies against an older version of the protein S-D614G (January 2020) and therefore have difficulty recognizing new variants of the virus. In our project we propose to obtain specific and precise antibodies by means of so-called controlled infection against specific infectious variants of the SARS-CoV-2 virus “here and now”. Currently, several variants of this pathogen have already emerged that threaten the health and lives of patients. We propose to reduce this threat by partially, but not completely, blocking the fusion mechanism of the SARS-CoV-2 virus into human respiratory cells. According to our plan, this can be achieved by inhibiting cathepsin L activity in respiratory cells, after introducing natural and non-toxic cysteine protease inhibitors into this area. We obtain these inhibitors by our own method from natural, “human body friendly” natural resources. We hypothesize that blocking cathepsin L will reduce the number of infecting viruses in cells to such an extent that COVID-19 developing in infected individuals will not threaten their health and life. At the same time, the number of viruses will be sufficient for the body's own immune system to produce precise antibodies against a specific version of this pathogen.
Collapse
Affiliation(s)
- Maciej Siewiński
- Wroclaw Medical University, Wroclaw, Poland; TherapyRaft comp. Wroclaw, Poland
| | - Barbara Bażanów
- Wrocław University of Environmental and Life Sciences, Faculty of Veterinary Medicine, Department of Pathology, C.K.Norwida 31, 50-375 Wrocław, Poland,Corresponding author
| | - Beata Orzechowska
- Laboratory of Virology, Ludwik Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Weigla 12, 53-114 Wroclaw, Poland
| | - Krzysztof Gołąb
- Department of Pharmaceutical Biochemistry, Wroclaw Medical University, Borowska 211A, Wrocław, Poland
| | - Jakub Gburek
- Department of Pharmaceutical Biochemistry, Wroclaw Medical University, Borowska 211A, Wrocław, Poland
| | - Adam Matkowski
- Wroclaw Medical University, Dept. Pharmaceutical Biology and Biotechnology
| | - Andrzej Rapak
- Department of Experimental Oncology, Ludwik Hirszfeld Institute of Immunology and Experimental Therapy, Wroclaw, Poland
| | - Anna Janocha
- Wroclaw Medical University, Dept. Physiology, Wrocław, Poland Chałubińskiego 10
| | | | - Maciej Dobrzyński
- Wroclaw Medical University, Dept. of Conservative Dentistry and Pedodontics: Wroclaw, Poland
| | - Ewa Kilar
- Wroclaw Medical University, Dept. of Clinical Pharmacology Wroclaw, Poland
| |
Collapse
|
15
|
FeMV is a cathepsin-dependent unique morbillivirus infecting the kidneys of domestic cats. Proc Natl Acad Sci U S A 2022; 119:e2209405119. [PMID: 36251995 PMCID: PMC9618091 DOI: 10.1073/pnas.2209405119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Feline morbillivirus (FeMV) is a recently discovered pathogen of domestic cats and has been classified as a morbillivirus in the Paramyxovirus family. We determined the complete sequence of FeMVUS5 directly from an FeMV-positive urine sample without virus isolation or cell passage. Sequence analysis of the viral genome revealed potential divergence from characteristics of archetypal morbilliviruses. First, the virus lacks the canonical polybasic furin cleavage signal in the fusion (F) glycoprotein. Second, conserved amino acids in the hemagglutinin (H) glycoprotein used by all other morbilliviruses for binding and/or fusion activation with the cellular receptor CD150 (signaling lymphocyte activation molecule [SLAM]/F1) are absent. We show that, despite this sequence divergence, FeMV H glycoprotein uses feline CD150 as a receptor and cannot use human CD150. We demonstrate that the protease responsible for cleaving the FeMV F glycoprotein is a cathepsin, making FeMV a unique morbillivirus and more similar to the closely related zoonotic Nipah and Hendra viruses. We developed a reverse genetics system for FeMVUS5 and generated recombinant viruses expressing Venus fluorescent protein from an additional transcription unit located either between the phospho-protein (P) and matrix (M) genes or the H and large (L) genes of the genome. We used these recombinant FeMVs to establish a natural infection and demonstrate that FeMV causes an acute morbillivirus-like disease in the cat. Virus was shed in the urine and detectable in the kidneys at later time points. This opens the door for long-term studies to address the postulated role of this morbillivirus in the development of chronic kidney disease.
Collapse
|
16
|
Günther SC, Martínez-Romero C, Sempere Borau M, Pham CTN, García-Sastre A, Stertz S. Proteomic Identification of Potential Target Proteins of Cathepsin W for Its Development as a Drug Target for Influenza. Microbiol Spectr 2022; 10:e0092122. [PMID: 35867415 PMCID: PMC9431242 DOI: 10.1128/spectrum.00921-22] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Accepted: 07/01/2022] [Indexed: 11/24/2022] Open
Abstract
Influenza A virus (IAV) coopts numerous host factors for efficient replication. The cysteine protease cathepsin W (CTSW) has been identified as one host factor required for IAV entry, specifically for the escape of IAVs from late endosomes. However, the substrate specificity of CTSW and the proviral mechanism are thus far unknown. Here, we show that intracellular but not secreted CTSW promotes viral entry. We reveal 79 potential direct and 31 potential indirect cellular target proteins of CTSW using the high-throughput proteomic approach terminal amine isotopic labeling of substrates (TAILS) and determine the cleavage motif shared by the substrates of CTSW. Subsequent integration with data from RNA interference (RNAi) screens for IAV host factors uncovers first insights into the proviral function of CTSW. Notably, CTSW-deficient mice display a 25% increase in survival and a delay in mortality compared to wild-type mice upon IAV infection. Altogether, these findings support the development of drugs targeting CTSW as novel host-directed antiviral therapies. IMPORTANCE Influenza viruses are respiratory pathogens and pose a constant threat to human health. Although antiviral drugs are available for influenza, the emergence and spread of drug-resistant viruses is cause for concern. Therefore, the development of new antivirals with lower chances of their target viruses acquiring resistance is urgently needed to reduce the high morbidity and mortality caused by influenza. Promising alternatives to drugs targeting viral proteins are those directed against host factors required for viral replication. The cysteine protease cathepsin W (CTSW) is an important host factor for IAV replication, and its proteolytic activity is required for fusion of viral and endosomal membranes. In this work, we identify a number of hitherto unknown CTSW substrates, providing new insights into virus-host interactions, and reveal that CTSW might also play a proviral role in an in vivo model. These results support the development of CTSW as a drug target for next-generation antivirals against influenza.
Collapse
Affiliation(s)
- Sira C. Günther
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland
- Life Science Zurich Graduate School, ETH and University of Zurich, Zurich, Switzerland
| | - Carles Martínez-Romero
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, New York, USA
- Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Milagros Sempere Borau
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland
- Life Science Zurich Graduate School, ETH and University of Zurich, Zurich, Switzerland
| | - Christine T. N. Pham
- Department of Medicine, Division of Rheumatology, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Adolfo García-Sastre
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, New York, USA
- Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA
- Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA
- The Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA
- Department of Pathology, Molecular and Cell-Based Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Silke Stertz
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland
| |
Collapse
|
17
|
The Key Role of Lysosomal Protease Cathepsins in Viral Infections. Int J Mol Sci 2022; 23:ijms23169089. [PMID: 36012353 PMCID: PMC9409221 DOI: 10.3390/ijms23169089] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 08/10/2022] [Accepted: 08/12/2022] [Indexed: 11/17/2022] Open
Abstract
Cathepsins encompass a family of lysosomal proteases that mediate protein degradation and turnover. Although mainly localized in the endolysosomal compartment, cathepsins are also found in the cytoplasm, nucleus, and extracellular space, where they are involved in cell signaling, extracellular matrix assembly/disassembly, and protein processing and trafficking through the plasma and nuclear membrane and between intracellular organelles. Ubiquitously expressed in the body, cathepsins play regulatory roles in a wide range of physiological processes including coagulation, hormone secretion, immune responses, and others. A dysregulation of cathepsin expression and/or activity has been associated with many human diseases, including cancer, diabetes, obesity, cardiovascular and inflammatory diseases, kidney dysfunctions, and neurodegenerative disorders, as well as infectious diseases. In viral infections, cathepsins may promote (1) activation of the viral attachment glycoproteins and entry of the virus into target cells; (2) antigen processing and presentation, enabling the virus to replicate in infected cells; (3) up-regulation and processing of heparanase that facilitates the release of viral progeny and the spread of infection; and (4) activation of cell death that may either favor viral clearance or assist viral propagation. In this review, we report the most relevant findings on the molecular mechanisms underlying cathepsin involvement in viral infection physiopathology, and we discuss the potential of cathepsin inhibitors for therapeutical applications in viral infectious diseases.
Collapse
|
18
|
Wang Z, Dang HV, Amaya M, Xu Y, Yin R, Yan L, Hickey AC, Annand EJ, Horsburgh BA, Reid PA, Smith I, Eden JS, Xu K, Broder CC, Veesler D. Potent monoclonal antibody-mediated neutralization of a divergent Hendra virus variant. Proc Natl Acad Sci U S A 2022; 119:e2122769119. [PMID: 35617431 PMCID: PMC9295758 DOI: 10.1073/pnas.2122769119] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Accepted: 04/16/2022] [Indexed: 12/27/2022] Open
Abstract
Hendra virus (HeV) and Nipah virus (NiV) are deadly zoonotic Henipaviruses (HNVs) responsible for recurrent outbreaks in humans and domestic species of highly fatal (50 to 95%) disease. A HeV variant (HeV-g2) of unprecedented genetic divergence has been identified in two fatally diseased horses, and in two flying fox species in regions of Australia not previously considered at risk for HeV spillover. Given the HeV-g2 divergence from HeV while retaining equivalent pathogenicity and spillover potential, understanding receptor usage and antigenic properties is urgently required to guide One Health biosecurity. Here, we show that the HeV-g2 G glycoprotein shares a conserved receptor tropism with prototypic HeV and that a panel of monoclonal antibodies recognizing the G and F glycoproteins potently neutralizes HeV-g2– and HeV G/F–mediated entry into cells. We determined a crystal structure of the Fab fragment of the hAH1.3 antibody bound to the HeV G head domain, revealing an antigenic site associated with potent cross-neutralization of both HeV-g2 and HeV. Structure-guided formulation of a tetravalent monoclonal antibody (mAb) mixture, targeting four distinct G head antigenic sites, results in potent neutralization of HeV and HeV-g2 and delineates a path forward for implementing multivalent mAb combinations for postexposure treatment of HNV infections.
Collapse
Affiliation(s)
- Zhaoqian Wang
- Department of Biochemistry, University of Washington, Seattle, WA 98195
| | - Ha V. Dang
- Department of Biochemistry, University of Washington, Seattle, WA 98195
| | - Moushimi Amaya
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD 20814
- Henry M. Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD 20814
| | - Yan Xu
- Department of Veterinary Biosciences, The Ohio State University, Columbus, OH 43210
| | - Randy Yin
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD 20814
- Henry M. Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD 20814
| | - Lianying Yan
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD 20814
- Henry M. Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD 20814
| | - Andrew C. Hickey
- Henry M. Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD 20814
- US Public Health Services Commissioned Corps, Rockville, MD 20852
| | - Edward J. Annand
- Sydney School of Veterinary Science, University of Sydney, Sydney, 2570 NSW, Australia
- Sydney Institute for Infectious Diseases, University of Sydney, Sydney, 2006 NSW, Australia
- Black Mountain Laboratories, Health and Biosecurity, Commonwealth Scientific and Industrial Research Organisation, Canberra, 2601 ACT, Australia
- Equine Veterinary and One Health Epidemiology, EquiEpiVet, Aireys Inlet, Surf Coast, 3231 VIC, Australia
| | - Bethany A. Horsburgh
- University of Sydney School of Medicine, Sydney, 2006 NSW, Australia
- Westmead Institute for Medical Research, Sydney, 2145 NSW, Australia
| | - Peter A. Reid
- Private Equine Veterinary Practice, Brisbane, 4034 QLD, Australia
| | - Ina Smith
- Black Mountain Laboratories, Health and Biosecurity, Commonwealth Scientific and Industrial Research Organisation, Canberra, 2601 ACT, Australia
| | - John-Sebastian Eden
- University of Sydney School of Medicine, Sydney, 2006 NSW, Australia
- Westmead Institute for Medical Research, Sydney, 2145 NSW, Australia
| | - Kai Xu
- Department of Veterinary Biosciences, The Ohio State University, Columbus, OH 43210
| | - Christopher C. Broder
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD 20814
| | - David Veesler
- Department of Biochemistry, University of Washington, Seattle, WA 98195
- HHMI, University of Washington, Seattle, WA 98195
| |
Collapse
|
19
|
Puerta-Guardo H. Editorial: From Pathogenic Infections to Inflammation and Disease - the Tumultuous Road of the 'Cytokine Storm'. Front Cell Infect Microbiol 2022; 11:827151. [PMID: 35083169 PMCID: PMC8785243 DOI: 10.3389/fcimb.2021.827151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Accepted: 12/13/2021] [Indexed: 11/13/2022] Open
Affiliation(s)
- Henry Puerta-Guardo
- Collaborative Unit for Entomological Bioassays, Campus of Biological Sciences and Agriculture, Autonomous University of Yucatan, Merida, Mexico.,Virology Laboratory, Center for Research "Dr. Hideyo Noguchi", Autonomous University of Yucatan, Merida, Mexico
| |
Collapse
|
20
|
Analysis of Hendra Virus Fusion Protein N-Terminal Transmembrane Residues. Viruses 2021; 13:v13122353. [PMID: 34960622 PMCID: PMC8707071 DOI: 10.3390/v13122353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 11/22/2021] [Accepted: 11/23/2021] [Indexed: 11/17/2022] Open
Abstract
Hendra virus (HeV) is a zoonotic enveloped member of the family Paramyoxviridae. To successfully infect a host cell, HeV utilizes two surface glycoproteins: the attachment (G) protein to bind, and the trimeric fusion (F) protein to merge the viral envelope with the membrane of the host cell. The transmembrane (TM) region of HeV F has been shown to have roles in F protein stability and the overall trimeric association of F. Previously, alanine scanning mutagenesis has been performed on the C-terminal end of the protein, revealing the importance of β-branched residues in this region. Additionally, residues S490 and Y498 have been demonstrated to be important for F protein endocytosis, needed for the proteolytic processing of F required for fusion. To complete the analysis of the HeV F TM, we performed alanine scanning mutagenesis to explore the residues in the N-terminus of this region (residues 487-506). In addition to confirming the critical roles for S490 and Y498, we demonstrate that mutations at residues M491 and L492 alter F protein function, suggesting a role for these residues in the fusion process.
Collapse
|
21
|
Costanzi E, Kuzikov M, Esposito F, Albani S, Demitri N, Giabbai B, Camasta M, Tramontano E, Rossetti G, Zaliani A, Storici P. Structural and Biochemical Analysis of the Dual Inhibition of MG-132 against SARS-CoV-2 Main Protease (Mpro/3CLpro) and Human Cathepsin-L. Int J Mol Sci 2021; 22:11779. [PMID: 34769210 PMCID: PMC8583849 DOI: 10.3390/ijms222111779] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 10/22/2021] [Accepted: 10/26/2021] [Indexed: 12/26/2022] Open
Abstract
After almost two years from its first evidence, the COVID-19 pandemic continues to afflict people worldwide, highlighting the need for multiple antiviral strategies. SARS-CoV-2 main protease (Mpro/3CLpro) is a recognized promising target for the development of effective drugs. Because single target inhibition might not be sufficient to block SARS-CoV-2 infection and replication, multi enzymatic-based therapies may provide a better strategy. Here we present a structural and biochemical characterization of the binding mode of MG-132 to both the main protease of SARS-CoV-2, and to the human Cathepsin-L, suggesting thus an interesting scaffold for the development of double-inhibitors. X-ray diffraction data show that MG-132 well fits into the Mpro active site, forming a covalent bond with Cys145 independently from reducing agents and crystallization conditions. Docking of MG-132 into Cathepsin-L well-matches with a covalent binding to the catalytic cysteine. Accordingly, MG-132 inhibits Cathepsin-L with nanomolar potency and reversibly inhibits Mpro with micromolar potency, but with a prolonged residency time. We compared the apo and MG-132-inhibited structures of Mpro solved in different space groups and we identified a new apo structure that features several similarities with the inhibited ones, offering interesting perspectives for future drug design and in silico efforts.
Collapse
Affiliation(s)
- Elisa Costanzi
- Elettra—Sincrotrone Trieste, 34149 Trieste, Italy; (E.C.); (N.D.); (B.G.)
| | - Maria Kuzikov
- Fraunhofer Institute for Translational Medicine and Pharmacology (ITMP), 22525 Hamburg, Germany; (M.K.); (A.Z.)
- Department of Life Sciences and Chemistry, Jacobs University Bremen GmbH, 28759 Bremen, Germany
| | - Francesca Esposito
- Department of Life and Environmental Sciences, University of Cagliari, 09124 Cagliari, Italy; (F.E.); (M.C.); (E.T.)
| | - Simone Albani
- Institute for Neuroscience and Medicine (INM-9) and Institute for Advanced Simulations (IAS-5) “Computational Biomedicine”, Forschungszentrum Jülich, 52425 Jülich, Germany; (S.A.); (G.R.)
- Department of Biology, Faculty of Mathematics, Computer Science and Natural Sciences, RWTH Aachen University, 52062 Aachen, Germany
| | - Nicola Demitri
- Elettra—Sincrotrone Trieste, 34149 Trieste, Italy; (E.C.); (N.D.); (B.G.)
| | - Barbara Giabbai
- Elettra—Sincrotrone Trieste, 34149 Trieste, Italy; (E.C.); (N.D.); (B.G.)
| | - Marianna Camasta
- Department of Life and Environmental Sciences, University of Cagliari, 09124 Cagliari, Italy; (F.E.); (M.C.); (E.T.)
| | - Enzo Tramontano
- Department of Life and Environmental Sciences, University of Cagliari, 09124 Cagliari, Italy; (F.E.); (M.C.); (E.T.)
| | - Giulia Rossetti
- Institute for Neuroscience and Medicine (INM-9) and Institute for Advanced Simulations (IAS-5) “Computational Biomedicine”, Forschungszentrum Jülich, 52425 Jülich, Germany; (S.A.); (G.R.)
- Jülich Supercomputing Centre (JSC), Forschungszentrum Jülich, 52425 Jülich, Germany
- Department of Neurology, Faculty of Medicine, RWTH Aachen University, 52074 Aachen, Germany
| | - Andrea Zaliani
- Fraunhofer Institute for Translational Medicine and Pharmacology (ITMP), 22525 Hamburg, Germany; (M.K.); (A.Z.)
| | - Paola Storici
- Elettra—Sincrotrone Trieste, 34149 Trieste, Italy; (E.C.); (N.D.); (B.G.)
| |
Collapse
|
22
|
Antivirals targeting paramyxovirus membrane fusion. Curr Opin Virol 2021; 51:34-47. [PMID: 34592709 DOI: 10.1016/j.coviro.2021.09.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 09/01/2021] [Accepted: 09/02/2021] [Indexed: 01/29/2023]
Abstract
The Paramyxoviridae family includes enveloped single-stranded negative-sense RNA viruses such as measles, mumps, human parainfluenza, canine distemper, Hendra, and Nipah viruses, which cause a tremendous global health burden. The ability of paramyxoviral glycoproteins to merge viral and host membranes allows entry of the viral genome into host cells, as well as cell-cell fusion, an important contributor to disease progression. Recent molecular and structural advances in our understanding of the paramyxovirus membrane fusion machinery gave rise to various therapeutic approaches aiming at inhibiting viral infection, spread, and cytopathic effects. These therapeutic approaches include peptide mimics, antibodies, and small molecule inhibitors with various levels of success at inhibiting viral entry, increasing the potential of effective antiviral therapeutic development.
Collapse
|
23
|
Gamble A, Yeo YY, Butler AA, Tang H, Snedden CE, Mason CT, Buchholz DW, Bingham J, Aguilar HC, Lloyd-Smith JO. Drivers and Distribution of Henipavirus-Induced Syncytia: What Do We Know? Viruses 2021; 13:1755. [PMID: 34578336 PMCID: PMC8472861 DOI: 10.3390/v13091755] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 08/21/2021] [Accepted: 08/25/2021] [Indexed: 12/20/2022] Open
Abstract
Syncytium formation, i.e., cell-cell fusion resulting in the formation of multinucleated cells, is a hallmark of infection by paramyxoviruses and other pathogenic viruses. This natural mechanism has historically been a diagnostic marker for paramyxovirus infection in vivo and is now widely used for the study of virus-induced membrane fusion in vitro. However, the role of syncytium formation in within-host dissemination and pathogenicity of viruses remains poorly understood. The diversity of henipaviruses and their wide host range and tissue tropism make them particularly appropriate models with which to characterize the drivers of syncytium formation and the implications for virus fitness and pathogenicity. Based on the henipavirus literature, we summarized current knowledge on the mechanisms driving syncytium formation, mostly acquired from in vitro studies, and on the in vivo distribution of syncytia. While these data suggest that syncytium formation widely occurs across henipaviruses, hosts, and tissues, we identified important data gaps that undermined our understanding of the role of syncytium formation in virus pathogenesis. Based on these observations, we propose solutions of varying complexity to fill these data gaps, from better practices in data archiving and publication for in vivo studies, to experimental approaches in vitro.
Collapse
Affiliation(s)
- Amandine Gamble
- Department of Ecology & Evolutionary Biology, University of California Los Angeles, Los Angeles, CA 90095, USA; (A.A.B.); (H.T.); (C.E.S.); (J.O.L.-S.)
| | - Yao Yu Yeo
- Department of Microbiology & Immunology, Cornell University, Ithaca, NY 14850, USA; (Y.Y.Y.); (D.W.B.); (H.C.A.)
| | - Aubrey A. Butler
- Department of Ecology & Evolutionary Biology, University of California Los Angeles, Los Angeles, CA 90095, USA; (A.A.B.); (H.T.); (C.E.S.); (J.O.L.-S.)
| | - Hubert Tang
- Department of Ecology & Evolutionary Biology, University of California Los Angeles, Los Angeles, CA 90095, USA; (A.A.B.); (H.T.); (C.E.S.); (J.O.L.-S.)
| | - Celine E. Snedden
- Department of Ecology & Evolutionary Biology, University of California Los Angeles, Los Angeles, CA 90095, USA; (A.A.B.); (H.T.); (C.E.S.); (J.O.L.-S.)
| | - Christian T. Mason
- Department of Computational Medicine, University of California Los Angeles, Los Angeles, CA 90095, USA;
| | - David W. Buchholz
- Department of Microbiology & Immunology, Cornell University, Ithaca, NY 14850, USA; (Y.Y.Y.); (D.W.B.); (H.C.A.)
| | - John Bingham
- CSIRO Australian Centre for Disease Preparedness, Geelong, VIC 3220, Australia;
| | - Hector C. Aguilar
- Department of Microbiology & Immunology, Cornell University, Ithaca, NY 14850, USA; (Y.Y.Y.); (D.W.B.); (H.C.A.)
| | - James O. Lloyd-Smith
- Department of Ecology & Evolutionary Biology, University of California Los Angeles, Los Angeles, CA 90095, USA; (A.A.B.); (H.T.); (C.E.S.); (J.O.L.-S.)
| |
Collapse
|
24
|
Pan W, Hui N, Wang H, He H. Entry of bovine parainfluenza virus type 3 into MDBK cells occurs via clathrin-mediated endocytosis and macropinocytosis in a acid-dependent manner. Vet Microbiol 2021; 259:109148. [PMID: 34147763 DOI: 10.1016/j.vetmic.2021.109148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 06/06/2021] [Indexed: 12/27/2022]
Abstract
Bovine parainfluenza virus 3 (BPIV3) is an important respiratory pathogen of both young and adult cattle. No specific therapies are available for BPIV3. Understanding the viral internalization pathway of BPIV3 will provide new strategies for the development of antiviral treatments. Here, the entry mechanism of BPIV3 into MDBK cells was analyzed using chemical inhibitors and RNA silencing. Our data demonstrated that treatment with an inhibitor targeting the clathrin-mediated pathway or clathrin heavy chain (CHC) knockdown suppressed the entry of BPIV3 into MDBK cells. In contrast, sequestration of cellular cholesterol by nystatin or silencing of caveolin-1 had no effect on viral entry. Moreover, inhibition of critical modulators of macropinocytosis significantly reduced BPIV3 uptake. In addition, fluid-phase uptake was significantly increased in cells infected with BPIV3, which is indicative of virus-induced facilitation of macropinocytosis. These results suggest that BPIV3 enters MDBK cells via macropinocytosis and clathrin- but not caveolar-dependent endocytosis. Furthermore, inhibition of endosomal acidification and activation of cathepsin blocked BPIV3 entry, demonstrating that BPIV3 entered MDBK cells in a acid-dependent manner and required cathepsin L. Finally, we demonstrated that macropinocytosis but not clathrin-mediated endocytosis is dependent on actin dynamics during BPIV3 infection.
Collapse
Affiliation(s)
- Wei Pan
- Ruminant Diseases Research Center, College of Life Sciences, Shandong Normal University, Jinan, 250014, China; Key Laboratory of Animal Resistant Biology of Shandong, College of Life Sciences, Shandong Normal University, Jinan, 250014, China
| | - Nie Hui
- Ruminant Diseases Research Center, College of Life Sciences, Shandong Normal University, Jinan, 250014, China
| | - Hongmei Wang
- Ruminant Diseases Research Center, College of Life Sciences, Shandong Normal University, Jinan, 250014, China; Key Laboratory of Animal Resistant Biology of Shandong, College of Life Sciences, Shandong Normal University, Jinan, 250014, China
| | - Hongbin He
- Ruminant Diseases Research Center, College of Life Sciences, Shandong Normal University, Jinan, 250014, China; Key Laboratory of Animal Resistant Biology of Shandong, College of Life Sciences, Shandong Normal University, Jinan, 250014, China.
| |
Collapse
|
25
|
Bovine Parainfluenza Virus Type 3 (BPIV3) Enters HeLa Cells via Clathrin-Mediated Endocytosis in a Cholesterol- and Dynamin-Dependent Manner. Viruses 2021; 13:v13061035. [PMID: 34072688 PMCID: PMC8228847 DOI: 10.3390/v13061035] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 05/17/2021] [Accepted: 05/26/2021] [Indexed: 12/17/2022] Open
Abstract
Bovine parainfluenza virus 3 (BPIV3) is a crucial causative agent of respiratory disease in young and adult cattle. No specific therapies are available for BPIV3 infection. Understanding the internalization pathway of the virus will provide a new strategy for the development of antiviral therapy. Here, the mechanism of BPIV3 entry into HeLa cells was analyzed using RNA silencing and pharmacological inhibitors. Treatment of HeLa cells with hypertonic medium prevented BPIV3 internalization. These results indicated that BPIV3 entered HeLa cells via receptor-mediated endocytosis. Moreover, removing cell membrane cholesterol through MβCD treatment hampered viral penetration but not viral replication. In addition, BPIV3 infection was inhibited by pretreatment with dynasore or chlorpromazine (CPZ) or knockdown of dynamin II or clathrin heavy chain. However, virus entry was unaffected by nystatin, EIPA, wortmannin, or cytochalasin D treatment or caveolin-1 knockdown. These data demonstrated that the entry of BPIV3 into HeLa cells was dependent on clathrin-mediated endocytosis but not on caveolae-mediated endocytosis or the macropinocytosis pathway. Many viruses are transported to endosomes, which provide an acidic environment and release their genome upon separation from primary endocytic vesicles. However, we found that BPIV3 infection required endosomal cathepsins, but not a low pH. In summary, we show, for the first time, that BPIV3 enters HeLa cells through the clathrin-mediated endocytosis pathway, presenting novel insights into the invasion mechanism of Paramyxoviridae.
Collapse
|
26
|
Dang HV, Cross RW, Borisevich V, Bornholdt ZA, West BR, Chan YP, Mire CE, Da Silva SC, Dimitrov AS, Yan L, Amaya M, Navaratnarajah CK, Zeitlin L, Geisbert TW, Broder CC, Veesler D. Broadly neutralizing antibody cocktails targeting Nipah virus and Hendra virus fusion glycoproteins. Nat Struct Mol Biol 2021; 28:426-434. [PMID: 33927387 DOI: 10.1038/s41594-021-00584-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Accepted: 03/17/2021] [Indexed: 02/02/2023]
Abstract
Hendra virus (HeV) and Nipah virus (NiV) are henipaviruses (HNVs) causing respiratory illness and severe encephalitis in humans, with fatality rates of 50-100%. There are no licensed therapeutics or vaccines to protect humans. HeV and NiV use a receptor-binding glycoprotein (G) and a fusion glycoprotein (F) to enter host cells. HNV F and G are the main targets of the humoral immune response, and the presence of neutralizing antibodies is a correlate of protection against NiV and HeV in experimentally infected animals. We describe here two cross-reactive F-specific antibodies, 1F5 and 12B2, that neutralize NiV and HeV through inhibition of membrane fusion. Cryo-electron microscopy structures reveal that 1F5 and 12B2 recognize distinct prefusion-specific, conserved quaternary epitopes and lock F in its prefusion conformation. We provide proof-of-concept for using antibody cocktails for neutralizing NiV and HeV and define a roadmap for developing effective countermeasures against these highly pathogenic viruses.
Collapse
Affiliation(s)
- Ha V Dang
- Department of Biochemistry, University of Washington, Seattle, WA, USA
| | - Robert W Cross
- Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, TX, USA.,Galveston National Laboratory, University of Texas Medical Branch, Galveston, TX, USA
| | - Viktoriya Borisevich
- Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, TX, USA
| | | | | | - Yee-Peng Chan
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD, USA
| | - Chad E Mire
- Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, TX, USA.,Galveston National Laboratory, University of Texas Medical Branch, Galveston, TX, USA
| | | | - Antony S Dimitrov
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD, USA
| | - Lianying Yan
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD, USA
| | - Moushimi Amaya
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD, USA
| | | | | | - Thomas W Geisbert
- Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, TX, USA.,Galveston National Laboratory, University of Texas Medical Branch, Galveston, TX, USA
| | - Christopher C Broder
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD, USA
| | - David Veesler
- Department of Biochemistry, University of Washington, Seattle, WA, USA.
| |
Collapse
|
27
|
Fosse JH, Haraldsen G, Falk K, Edelmann R. Endothelial Cells in Emerging Viral Infections. Front Cardiovasc Med 2021; 8:619690. [PMID: 33718448 PMCID: PMC7943456 DOI: 10.3389/fcvm.2021.619690] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Accepted: 02/01/2021] [Indexed: 12/11/2022] Open
Abstract
There are several reasons to consider the role of endothelial cells in COVID-19 and other emerging viral infections. First, severe cases of COVID-19 show a common breakdown of central vascular functions. Second, SARS-CoV-2 replicates in endothelial cells. Third, prior deterioration of vascular function exacerbates disease, as the most common comorbidities of COVID-19 (obesity, hypertension, and diabetes) are all associated with endothelial dysfunction. Importantly, SARS-CoV-2's ability to infect endothelium is shared by many emerging viruses, including henipaviruses, hantavirus, and highly pathogenic avian influenza virus, all specifically targeting endothelial cells. The ability to infect endothelium appears to support generalised dissemination of infection and facilitate the access to certain tissues. The disturbed vascular function observed in severe COVID-19 is also a prominent feature of many other life-threatening viral diseases, underscoring the need to understand how viruses modulate endothelial function. We here review the role of vascular endothelial cells in emerging viral infections, starting with a summary of endothelial cells as key mediators and regulators of vascular and immune responses in health and infection. Next, we discuss endotheliotropism as a possible virulence factor and detail features that regulate viruses' ability to attach to and enter endothelial cells. We move on to review how endothelial cells detect invading viruses and respond to infection, with particular focus on pathways that may influence vascular function and the host immune system. Finally, we discuss how endothelial cell function can be dysregulated in viral disease, either by viral components or as bystander victims of overshooting or detrimental inflammatory and immune responses. Many aspects of how viruses interact with the endothelium remain poorly understood. Considering the diversity of such mechanisms among different emerging viruses allows us to highlight common features that may be of general validity and point out important challenges.
Collapse
Affiliation(s)
| | - Guttorm Haraldsen
- Department of Pathology, Oslo University Hospital, Oslo, Norway.,Department of Pathology, University of Oslo, Oslo, Norway
| | - Knut Falk
- Norwegian Veterinary Institute, Oslo, Norway.,AquaMed Consulting AS, Oslo, Norway
| | - Reidunn Edelmann
- Department of Clinical Medicine, Centre for Cancer Biomarkers CCBIO, University of Bergen, Bergen, Norway
| |
Collapse
|
28
|
Wong NA, Saier MH. The SARS-Coronavirus Infection Cycle: A Survey of Viral Membrane Proteins, Their Functional Interactions and Pathogenesis. Int J Mol Sci 2021; 22:1308. [PMID: 33525632 PMCID: PMC7865831 DOI: 10.3390/ijms22031308] [Citation(s) in RCA: 61] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 01/21/2021] [Accepted: 01/22/2021] [Indexed: 02/07/2023] Open
Abstract
Severe Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2) is a novel epidemic strain of Betacoronavirus that is responsible for the current viral pandemic, coronavirus disease 2019 (COVID-19), a global health crisis. Other epidemic Betacoronaviruses include the 2003 SARS-CoV-1 and the 2009 Middle East Respiratory Syndrome Coronavirus (MERS-CoV), the genomes of which, particularly that of SARS-CoV-1, are similar to that of the 2019 SARS-CoV-2. In this extensive review, we document the most recent information on Coronavirus proteins, with emphasis on the membrane proteins in the Coronaviridae family. We include information on their structures, functions, and participation in pathogenesis. While the shared proteins among the different coronaviruses may vary in structure and function, they all seem to be multifunctional, a common theme interconnecting these viruses. Many transmembrane proteins encoded within the SARS-CoV-2 genome play important roles in the infection cycle while others have functions yet to be understood. We compare the various structural and nonstructural proteins within the Coronaviridae family to elucidate potential overlaps and parallels in function, focusing primarily on the transmembrane proteins and their influences on host membrane arrangements, secretory pathways, cellular growth inhibition, cell death and immune responses during the viral replication cycle. We also offer bioinformatic analyses of potential viroporin activities of the membrane proteins and their sequence similarities to the Envelope (E) protein. In the last major part of the review, we discuss complement, stimulation of inflammation, and immune evasion/suppression that leads to CoV-derived severe disease and mortality. The overall pathogenesis and disease progression of CoVs is put into perspective by indicating several stages in the resulting infection process in which both host and antiviral therapies could be targeted to block the viral cycle. Lastly, we discuss the development of adaptive immunity against various structural proteins, indicating specific vulnerable regions in the proteins. We discuss current CoV vaccine development approaches with purified proteins, attenuated viruses and DNA vaccines.
Collapse
Affiliation(s)
- Nicholas A. Wong
- Department of Molecular Biology, Division of Biological Sciences, University of California at San Diego, La Jolla, CA 92093-0116, USA
| | - Milton H. Saier
- Department of Molecular Biology, Division of Biological Sciences, University of California at San Diego, La Jolla, CA 92093-0116, USA
| |
Collapse
|
29
|
Fischer K, Groschup MH, Diederich S. Importance of Endocytosis for the Biological Activity of Cedar Virus Fusion Protein. Cells 2020; 9:cells9092054. [PMID: 32911832 PMCID: PMC7565975 DOI: 10.3390/cells9092054] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 09/03/2020] [Accepted: 09/04/2020] [Indexed: 01/02/2023] Open
Abstract
Endocytosis plays a particular role in the proteolytic activation of highly pathogenic henipaviruses Hendra (HeV) and Nipah virus (NiV) fusion (F) protein precursors. These proteins require endocytic uptake from the cell surface to be cleaved by cellular proteases within the endosomal compartment, followed by recycling to the plasma membrane for incorporation into budding virions or mediation of cell-cell fusion. This internalization largely depends on a tyrosine-based consensus motif for endocytosis present in the cytoplasmic tail of HeV and NiV F. Given the large number of tyrosine residues present in the F protein cytoplasmic domain of Cedar virus (CedV), a closely related but low pathogenic henipavirus, we aimed to investigate whether CedV F protein undergoes signal-mediated endocytosis from the cell surface controlled by tyrosine-based motifs present in its cytoplasmic tail and whether endocytosis is relevant for its biological activity. Therefore, tyrosine-based signals were mutated, and mutations were assessed for their effect on F cell surface expression, endocytosis, and biological activity. A membrane-proximal YXXΦ motif and a C-terminal di-tyrosine motif are of particular importance for cell surface expression and endocytosis rate. Furthermore, our data strongly indicate the pivotal role of endocytosis for the biological activity of the CedV F protein.
Collapse
|
30
|
Margolin EA, Strasser R, Chapman R, Williamson AL, Rybicki EP, Meyers AE. Engineering the Plant Secretory Pathway for the Production of Next-Generation Pharmaceuticals. Trends Biotechnol 2020; 38:1034-1044. [PMID: 32818443 DOI: 10.1016/j.tibtech.2020.03.004] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Revised: 03/06/2020] [Accepted: 03/06/2020] [Indexed: 02/06/2023]
Abstract
Production of biologics in plants, or plant molecular pharming, is a promising protein expression technology that is receiving increasing attention from the pharmaceutical industry. Previously, low expression yields of recombinant proteins and the realization that certain post-translational modifications (PTMs) may not occur optimally limited the widespread acceptance of the technology. However, molecular engineering of the plant secretory pathway is now enabling the production of increasingly complex biomolecules using tailored protein-specific approaches to ensure their maturation. These involve the elimination of undesired processing events, and the introduction of heterologous biosynthetic machinery to support the production of specific target proteins. Here, we discuss recent advances in the production of pharmaceutical proteins in plants, which leverage the unique advantages of the technology.
Collapse
Affiliation(s)
- Emmanuel A Margolin
- Division of Medical Virology, Department of Pathology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa; Wellcome Trust Centre for Infectious Disease Research in Africa, University of Cape Town, Cape Town, South Africa; Institute of Infectious Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa; Biopharming Research Unit, Department of Molecular and Cell Biology, University of Cape Town, Cape Town, South Africa.
| | - Richard Strasser
- Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Ros Chapman
- Division of Medical Virology, Department of Pathology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa; Institute of Infectious Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Anna-Lise Williamson
- Division of Medical Virology, Department of Pathology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa; Wellcome Trust Centre for Infectious Disease Research in Africa, University of Cape Town, Cape Town, South Africa; Institute of Infectious Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Edward P Rybicki
- Division of Medical Virology, Department of Pathology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa; Institute of Infectious Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa; Biopharming Research Unit, Department of Molecular and Cell Biology, University of Cape Town, Cape Town, South Africa
| | - Ann E Meyers
- Biopharming Research Unit, Department of Molecular and Cell Biology, University of Cape Town, Cape Town, South Africa
| |
Collapse
|
31
|
Dash RN, Moharana AK, Subudhi BB. Sulfonamides: Antiviral Strategy for Neglected Tropical Disease Virus. CURR ORG CHEM 2020. [DOI: 10.2174/1385272824999200515094100] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The viral infections are a threat to the health system around the globe. Although
more than 60 antiviral drugs have been approved by the FDA, most of them are for the
management of few viruses like HIV, Hepatitis and Influenza. There is no antiviral for
many viruses including Dengue, Chikungunya and Japanese encephalitis. Many of these
neglected viruses are increasingly becoming global pathogens. Lack of broad spectrum of
action and the rapid rise of resistance and cross-resistance to existing antiviral have further
increased the challenge of antiviral development. Sulfonamide, as a privileged scaffold,
has been capitalized to develop several bioactive compounds and drugs. Accordingly, several
reviews have been published in recent times on bioactive sulfonamides. However,
there are not enough review reports of antiviral sulfonamides in the last five years. Sulfonamides
scaffolds have received sufficient attention for the development of non- nucleoside antivirals following
the emergence of cross-resistance to nucleoside inhibitors. Hybridization of bioactive pharmacophores
with sulfonamides has been used as a strategy to develop sulfonamide antivirals. This review is an effort to
analyze these attempts and evaluate their translational potential. Parameters including potency (IC50), toxicity
(CC50) and selectivity (CC50/IC50) have been used in this report to suggest the potential of sulfonamide derivatives
to progress further as antiviral. Since most of these antiviral properties are based on the in vitro results,
the drug-likeness of molecules has been predicted to propose in vivo potential. The structure-activity relationship
has been analyzed to encourage further optimization of antiviral properties.
Collapse
Affiliation(s)
- Rudra Narayan Dash
- Drug Development and Analysis Laboratory, School of Pharmaceutical Sciences, Siksha ‘O’ Anusandhan (Deemed to be University), Bhubaneswar-751029, Odisha, India
| | - Alok Kumar Moharana
- Drug Development and Analysis Laboratory, School of Pharmaceutical Sciences, Siksha ‘O’ Anusandhan (Deemed to be University), Bhubaneswar-751029, Odisha, India
| | - Bharat Bhusan Subudhi
- Drug Development and Analysis Laboratory, School of Pharmaceutical Sciences, Siksha ‘O’ Anusandhan (Deemed to be University), Bhubaneswar-751029, Odisha, India
| |
Collapse
|
32
|
Barrett CT, Dutch RE. Viral Membrane Fusion and the Transmembrane Domain. Viruses 2020; 12:v12070693. [PMID: 32604992 PMCID: PMC7412173 DOI: 10.3390/v12070693] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 06/24/2020] [Accepted: 06/25/2020] [Indexed: 01/05/2023] Open
Abstract
Initiation of host cell infection by an enveloped virus requires a viral-to-host cell membrane fusion event. This event is mediated by at least one viral transmembrane glycoprotein, termed the fusion protein, which is a key therapeutic target. Viral fusion proteins have been studied for decades, and numerous critical insights into their function have been elucidated. However, the transmembrane region remains one of the most poorly understood facets of these proteins. In the past ten years, the field has made significant advances in understanding the role of the membrane-spanning region of viral fusion proteins. We summarize developments made in the past decade that have contributed to the understanding of the transmembrane region of viral fusion proteins, highlighting not only their critical role in the membrane fusion process, but further demonstrating their involvement in several aspects of the viral lifecycle.
Collapse
|
33
|
Azarm KD, Lee B. Differential Features of Fusion Activation within the Paramyxoviridae. Viruses 2020; 12:v12020161. [PMID: 32019182 PMCID: PMC7077268 DOI: 10.3390/v12020161] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 01/25/2020] [Accepted: 01/29/2020] [Indexed: 12/13/2022] Open
Abstract
Paramyxovirus (PMV) entry requires the coordinated action of two envelope glycoproteins, the receptor binding protein (RBP) and fusion protein (F). The sequence of events that occurs during the PMV entry process is tightly regulated. This regulation ensures entry will only initiate when the virion is in the vicinity of a target cell membrane. Here, we review recent structural and mechanistic studies to delineate the entry features that are shared and distinct amongst the Paramyxoviridae. In general, we observe overarching distinctions between the protein-using RBPs and the sialic acid- (SA-) using RBPs, including how their stalk domains differentially trigger F. Moreover, through sequence comparisons, we identify greater structural and functional conservation amongst the PMV fusion proteins, as compared to the RBPs. When examining the relative contributions to sequence conservation of the globular head versus stalk domains of the RBP, we observe that, for the protein-using PMVs, the stalk domains exhibit higher conservation and find the opposite trend is true for SA-using PMVs. A better understanding of conserved and distinct features that govern the entry of protein-using versus SA-using PMVs will inform the rational design of broader spectrum therapeutics that impede this process.
Collapse
|
34
|
Navaratnarajah CK, Generous AR, Yousaf I, Cattaneo R. Receptor-mediated cell entry of paramyxoviruses: Mechanisms, and consequences for tropism and pathogenesis. J Biol Chem 2020; 295:2771-2786. [PMID: 31949044 DOI: 10.1074/jbc.rev119.009961] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Research in the last decade has uncovered many new paramyxoviruses, airborne agents that cause epidemic diseases in animals including humans. Most paramyxoviruses enter epithelial cells of the airway using sialic acid as a receptor and cause only mild disease. However, others cross the epithelial barrier and cause more severe disease. For some of these viruses, the host receptors have been identified, and the mechanisms of cell entry have been elucidated. The tetrameric attachment proteins of paramyxoviruses have vastly different binding affinities for their cognate receptors, which they contact through different binding surfaces. Nevertheless, all input signals are converted to the same output: conformational changes that trigger refolding of trimeric fusion proteins and membrane fusion. Experiments with selectively receptor-blinded viruses inoculated into their natural hosts have provided insights into tropism, identifying the cells and tissues that support growth and revealing the mechanisms of pathogenesis. These analyses also shed light on diabolically elegant mechanisms used by morbilliviruses, including the measles virus, to promote massive amplification within the host, followed by efficient aerosolization and rapid spread through host populations. In another paradigm of receptor-facilitated severe disease, henipaviruses, including Nipah and Hendra viruses, use different members of one protein family to cause zoonoses. Specific properties of different paramyxoviruses, like neurotoxicity and immunosuppression, are now understood in the light of receptor specificity. We propose that research on the specific receptors for several newly identified members of the Paramyxoviridae family that may not bind sialic acid is needed to anticipate their zoonotic potential and to generate effective vaccines and antiviral compounds.
Collapse
Affiliation(s)
| | - Alex R Generous
- Mayo Clinic Graduate School of Biomedical Sciences, Virology and Gene Therapy Track, Mayo Clinic, Rochester, Minnesota 55905
| | - Iris Yousaf
- Mayo Clinic Graduate School of Biomedical Sciences, Virology and Gene Therapy Track, Mayo Clinic, Rochester, Minnesota 55905
| | - Roberto Cattaneo
- Department of Molecular Medicine, Mayo Clinic, Rochester, Minnesota 55905.
| |
Collapse
|
35
|
Bhattacharya S, Dhar S, Banerjee A, Ray S. Detailed Molecular Biochemistry for Novel Therapeutic Design Against Nipah and Hendra Virus: A Systematic Review. Curr Mol Pharmacol 2019; 13:108-125. [PMID: 31657692 DOI: 10.2174/1874467212666191023123732] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2019] [Revised: 10/13/2019] [Accepted: 10/15/2019] [Indexed: 11/22/2022]
Abstract
BACKGROUND Nipah virus (NiV) and Hendra virus (HeV) of genus Henipavirus are the deadliest zoonotic viruses, which cause severe respiratory ailments and fatal encephalitis in humans and other susceptible animals. The fatality rate for these infections had been alarmingly high with no approved treatment available to date. Viral attachment and fusion with host cell membrane is essential for viral entry and is the most essential event of viral infection. Viral attachment is mediated by interaction of Henipavirus attachment glycoprotein (G) with the host cell receptor: Ephrin B2/B3, while viral fusion and endocytosis are mediated by the combined action of both viral glycoprotein (G) and fusion protein (F). CONCLUSION This review highlights the mechanism of viral attachment, fusion and also explains the basic mechanism and pathobiology of this infection in humans. The drugs and therapeutics used either experimentally or clinically against NiV and HeV infection have been documented and classified in detail. Some amino acid residues essential for the functionality of G and F proteins were also emphasized. Therapeutic designing to target and block these residues can serve as a promising approach in future drug development against NiV and HeV.
Collapse
Affiliation(s)
| | - Shreyeshi Dhar
- Amity Institute of Biotechnology, Amity University, Kolkata, India
| | - Arundhati Banerjee
- Department of Biochemistry and Biophysics, University of Kalyani, Kalyani, Nadia, India
| | - Sujay Ray
- Amity Institute of Biotechnology, Amity University, Kolkata, India
| |
Collapse
|
36
|
Transmembrane Domain Dissociation Is Required for Hendra Virus F Protein Fusogenic Activity. J Virol 2019; 93:JVI.01069-19. [PMID: 31462574 DOI: 10.1128/jvi.01069-19] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Accepted: 08/19/2019] [Indexed: 12/12/2022] Open
Abstract
Hendra virus (HeV) is a zoonotic paramyxovirus that utilizes a trimeric fusion (F) protein within its lipid bilayer to mediate membrane merger with a cell membrane for entry. Previous HeV F studies showed that transmembrane domain (TMD) interactions are important for stabilizing the prefusion conformation of the protein prior to triggering. Thus, the current model for HeV F fusion suggests that modulation of TMD interactions is critical for initiation and completion of conformational changes that drive membrane fusion. HeV F constructs (T483C/V484C, V484C/N485C, and N485C/P486C) were generated with double cysteine substitutions near the N-terminal region of the TMD to study the effect of altered flexibility in this region. Oligomeric analysis showed that the double cysteine substitutions successfully promoted intersubunit disulfide bond formation in HeV F. Subsequent fusion assays indicated that the introduction of disulfide bonds in the mutants prohibited fusion events. Further testing confirmed that T483C/V484C and V484C/N485C were expressed at the cell surface at levels that would allow for fusion. Attempts to restore fusion with a reducing agent were unsuccessful, suggesting that the introduced disulfide bonds were likely buried in the membrane. Conformational analysis showed that T483C/V484C and V484C/N485C were able to bind a prefusion conformation-specific antibody prior to cell disruption, indicating that the introduced disulfide bonds did not significantly affect protein folding. This study is the first to report that TMD dissociation is required for HeV F fusogenic activity and strengthens our model for HeV fusion.IMPORTANCE The paramyxovirus Hendra virus (HeV) causes severe respiratory illness and encephalitis in humans. To develop therapeutics for HeV and related viral infections, further studies are needed to understand the mechanisms underlying paramyxovirus fusion events. Knowledge gained in studies of the HeV fusion (F) protein may be applicable to a broad span of enveloped viruses. In this study, we demonstrate that disulfide bonds introduced between the HeV F transmembrane domains (TMDs) block fusion. Depending on the location of these disulfide bonds, HeV F can still fold properly and bind a prefusion conformation-specific antibody prior to cell disruption. These findings support our current model for HeV membrane fusion and expand our knowledge of the TMD and its role in HeV F stability and fusion promotion.
Collapse
|
37
|
Papanastasiou M, Mullahoo J, DeRuff KC, Bajrami B, Karageorgos I, Johnston SE, Peckner R, Myers SA, Carr SA, Jaffe JD. Chasing Tails: Cathepsin-L Improves Structural Analysis of Histones by HX-MS. Mol Cell Proteomics 2019; 18:2089-2098. [PMID: 31409669 PMCID: PMC6773551 DOI: 10.1074/mcp.ra119.001325] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 07/19/2019] [Indexed: 12/27/2022] Open
Abstract
The N-terminal regions (tails) of histone proteins are dynamic elements that protrude from the nucleosome and are involved in many aspects of chromatin organization. Their epigenetic role is well-established, and post-translational modifications present on these regions contribute to transcriptional regulation. Considering their biological significance, relatively few structural details have been established for histone tails, mainly because of their inherently disordered nature. Although hydrogen/deuterium exchange mass spectrometry (HX-MS) is well-suited for the analysis of dynamic structures, it has seldom been employed in this context, presumably because of the poor N-terminal coverage provided by pepsin. Inspired from histone-clipping events, we profiled the activity of cathepsin-L under HX-MS quench conditions and characterized its specificity employing the four core histones (H2A, H2B, H3 and H4). Cathepsin-L demonstrated cleavage patterns that were substrate- and pH-dependent. Cathepsin-L generated overlapping N-terminal peptides about 20 amino acids long for H2A, H3, and H4 proving its suitability for the analysis of histone tails dynamics. We developed a comprehensive HX-MS method in combination with pepsin and obtained full sequence coverage for all histones. We employed our method to analyze histones H3 and H4. We observe rapid deuterium exchange of the N-terminal tails and cooperative unfolding (EX1 kinetics) in the histone-fold domains of histone monomers in-solution. Overall, this novel strategy opens new avenues for investigating the dynamic properties of histones that are not apparent from the crystal structures, providing insights into the structural basis of the histone code.
Collapse
Affiliation(s)
| | | | | | | | - Ioannis Karageorgos
- Biomolecular Measurements Division, National Institute of Standards and Technology, Gaithersburg, MD;; Institute for Bioscience and Biotechnology Research, Rockville, MD
| | | | - Ryan Peckner
- The Broad Institute of MIT and Harvard, Cambridge, MA
| | | | - Steven A Carr
- The Broad Institute of MIT and Harvard, Cambridge, MA
| | - Jacob D Jaffe
- The Broad Institute of MIT and Harvard, Cambridge, MA
| |
Collapse
|
38
|
An antibody against the F glycoprotein inhibits Nipah and Hendra virus infections. Nat Struct Mol Biol 2019; 26:980-987. [PMID: 31570878 PMCID: PMC6858553 DOI: 10.1038/s41594-019-0308-9] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 08/21/2019] [Indexed: 12/02/2022]
Abstract
Nipah virus (NiV) and Hendra virus (HeV) are zoonotic henipaviruses (HNVs) responsible for outbreaks of encephalitis and respiratory illness with fatality rates of 50–100%. No vaccines or licensed therapeutics currently exist to protect humans against NiV or HeV. HNVs enter host cells by fusing the viral and cellular membranes via the concerted action of the attachment (G) and fusion (F) glycoproteins, the main targets of the humoral immune response. Here, we describe the isolation and humanization of a potent monoclonal antibody cross-neutralizing NiV and HeV. Cryo-electron microscopy, triggering and fusion studies show the antibody binds to a prefusion-specific quaternary epitope, conserved in NiV F and HeV F glycoproteins, and prevents membrane fusion and viral entry. This work supports the importance of the HNV prefusion F conformation for eliciting a robust immune response and paves the way for using this antibody for prophylaxis and post-exposure therapy with NiV- and HeV-infected individuals. An antibody that recognizes the F glycoproteins from Nipah and Hendra viruses can neutralize both viruses and recognizes a quaternary epitope in the prefusion F trimer, preventing conformational changes required for fusion.
Collapse
|
39
|
Izaguirre G. The Proteolytic Regulation of Virus Cell Entry by Furin and Other Proprotein Convertases. Viruses 2019; 11:v11090837. [PMID: 31505793 PMCID: PMC6784293 DOI: 10.3390/v11090837] [Citation(s) in RCA: 101] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 09/03/2019] [Accepted: 09/06/2019] [Indexed: 12/11/2022] Open
Abstract
A wide variety of viruses exploit furin and other proprotein convertases (PCs) of the constitutive protein secretion pathway in order to regulate their cell entry mechanism and infectivity. Surface proteins of enveloped, as well as non-enveloped, viruses become processed by these proteases intracellularly during morphogenesis or extracellularly after egress and during entry in order to produce mature virions activated for infection. Although viruses also take advantage of other proteases, it is when some viruses become reactive with PCs that they may develop high pathogenicity. Besides reacting with furin, some viruses may also react with the PCs of the other specificity group constituted by PC4/PC5/PACE4/PC7. The targeting of PCs for inhibition may result in a useful strategy to treat infections with some highly pathogenic viruses. A wide variety of PC inhibitors have been developed and tested for their antiviral activity in cell-based assays.
Collapse
Affiliation(s)
- Gonzalo Izaguirre
- College of Dentistry, University of Illinois at Chicago, Chicago, IL 60612, USA.
| |
Collapse
|
40
|
Voigt K, Hoffmann M, Drexler JF, Müller MA, Drosten C, Herrler G, Krüger N. Fusogenicity of the Ghana Virus ( Henipavirus: Ghanaian bat henipavirus) Fusion Protein is Controlled by the Cytoplasmic Domain of the Attachment Glycoprotein. Viruses 2019; 11:v11090800. [PMID: 31470664 PMCID: PMC6784138 DOI: 10.3390/v11090800] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2019] [Revised: 08/28/2019] [Accepted: 08/28/2019] [Indexed: 01/11/2023] Open
Abstract
The Ghana virus (GhV) is phylogenetically related to the zoonotic henipaviruses Nipah (NiV) and Hendra virus. Although GhV uses the highly conserved receptor ephrin-B2, the fusogenicity is restricted to cell lines of bat origin. Furthermore, the surface expression of the GhV attachment glycoprotein (G) is reduced compared to NiV and most of this protein is retained in the endoplasmic reticulum (ER). Here, we generated truncated as well as chimeric GhV G proteins and investigated the influence of the structural domains (cytoplasmic tail, transmembrane domain, ectodomain) of this protein on the intracellular transport and the fusogenicity following coexpression with the GhV fusion protein (F). We demonstrate that neither the cytoplasmic tail nor the transmembrane domain is responsible for the intracellular retention of GhV G. Furthermore, the cytoplasmic tail of GhV G modulates the fusogenicity of GhV F and therefore controls the species-restricted fusogenicity of the GhV surface glycoproteins.
Collapse
Affiliation(s)
- Kathleen Voigt
- Institute of Virology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany
- Research Center for Emerging Infections and Zoonoses, University of Veterinary Medicine Hannover, 30559 Hannover, Germany
| | - Markus Hoffmann
- Infection Biology Unit, German Primate Center-Leibniz Institute for Primate Research, 37077 Göttingen, Germany
| | - Jan Felix Drexler
- Institute of Virology, Charité Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, 10117 Berlin, Germany
| | - Marcel Alexander Müller
- Institute of Virology, Charité Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, 10117 Berlin, Germany
| | - Christian Drosten
- Institute of Virology, Charité Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, 10117 Berlin, Germany
| | - Georg Herrler
- Institute of Virology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany
| | - Nadine Krüger
- Institute of Virology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany.
- Research Center for Emerging Infections and Zoonoses, University of Veterinary Medicine Hannover, 30559 Hannover, Germany.
| |
Collapse
|
41
|
A Hydrophobic Target: Using the Paramyxovirus Fusion Protein Transmembrane Domain To Modulate Fusion Protein Stability. J Virol 2019; 93:JVI.00863-19. [PMID: 31217248 DOI: 10.1128/jvi.00863-19] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Accepted: 06/12/2019] [Indexed: 12/15/2022] Open
Abstract
Enveloped viruses utilize surface glycoproteins to bind and fuse with a target cell membrane. The zoonotic Hendra virus (HeV), a member of the family Paramyxoviridae, utilizes the attachment protein (G) and the fusion protein (F) to perform these critical functions. Upon triggering, the trimeric F protein undergoes a large, irreversible conformation change to drive membrane fusion. Previously, we have shown that the transmembrane (TM) domain of the F protein, separate from the rest of the protein, is present in a monomer-trimer equilibrium. This TM-TM association contributes to the stability of the prefusion form of the protein, supporting a role for TM-TM interactions in the control of F protein conformational changes. To determine the impact of disrupting TM-TM interactions, constructs expressing the HeV F TM with limited flanking sequences were synthesized. Coexpression of these constructs with HeV F resulted in dramatic reductions in the stability of F protein expression and fusion activity. In contrast, no effects were observed when the HeV F TM constructs were coexpressed with the nonhomologous parainfluenza virus 5 (PIV5) fusion protein, indicating a requirement for specific interactions. To further examine this, a TM peptide homologous to the PIV5 F TM domain was synthesized. Addition of the peptide prior to infection inhibited infection with PIV5 but did not significantly affect infection with human metapneumovirus, a related virus. These results indicate that targeted disruption of TM-TM interactions significantly impact viral fusion protein stability and function, presenting these interactions as a novel target for antiviral development.IMPORTANCE Enveloped viruses require virus-cell membrane fusion to release the viral genome and replicate. The viral fusion protein triggers from the pre- to the postfusion conformation, an essentially irreversible change, to drive membrane fusion. We found that small proteins containing the TM and a limited flanking region homologous to the fusion protein of the zoonotic Hendra virus reduced protein expression and fusion activity. The introduction of exogenous TM peptides may displace a TM domain, disrupting native TM-TM interactions and globally destabilizing the fusion protein. Supporting this hypothesis, we showed that a sequence-specific transmembrane peptide dramatically reduced viral infection in another enveloped virus model, suggesting a broader inhibitory mechanism. Viral fusion protein TM-TM interactions are important for protein function, and disruption of these interactions dramatically reduces protein stability.
Collapse
|
42
|
Henipavirus Infection: Natural History and the Virus-Host Interplay. CURRENT TREATMENT OPTIONS IN INFECTIOUS DISEASES 2018. [DOI: 10.1007/s40506-018-0155-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
43
|
Host Cell Proteases: Cathepsins. ACTIVATION OF VIRUSES BY HOST PROTEASES 2018. [PMCID: PMC7123490 DOI: 10.1007/978-3-319-75474-1_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Cathepsins are proteolytic enzymes with a broad spectrum of substrates. They are known to reside within endo-lysosomes where they acquire optimal conditions for proteolytic activity and substrate cleavage. However, cathepsins have been detected in locations other than the canonical compartments of the endocytotic pathway. They are often secreted from cells in either proteolytically inactive proform or as mature and active enzyme; this may happen in both physiological and pathological conditions. Moreover, cytosolic and nuclear forms of cathepsins have been described and are currently an emerging field of research aiming at understanding their functions in such unexpected cellular locations. This chapter summarizes the canonical pathways of biosynthesis and transport of cathepsins in healthy cells. We further describe how cathepsins can reach unexpected locations such as the extracellular space or the cytosol and the nuclear matrix. No matter where viruses and cathepsins encounter, several outcomes can be perceived. Thus, scenarios are discussed on how cathepsins may support virus entry into host cells, involve in viral fusion factor and polyprotein processing in different host cell compartments, or help in packaging of viral particles during maturation. It is of note to mention that this review is not meant to comprehensively cover the present literature on viruses encountering cathepsins but rather illustrates, on some representative examples, the possible roles of cathepsins in replication of viruses and in the course of disease.
Collapse
|
44
|
Mutations in the Transmembrane Domain and Cytoplasmic Tail of Hendra Virus Fusion Protein Disrupt Virus-Like-Particle Assembly. J Virol 2017; 91:JVI.00152-17. [PMID: 28468881 DOI: 10.1128/jvi.00152-17] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Accepted: 04/12/2017] [Indexed: 12/13/2022] Open
Abstract
Hendra virus (HeV) is a zoonotic paramyxovirus that causes deadly illness in horses and humans. An intriguing feature of HeV is the utilization of endosomal protease for activation of the viral fusion protein (F). Here we investigated how endosomal F trafficking affects HeV assembly. We found that the HeV matrix (M) and F proteins each induced particle release when they were expressed alone but that their coexpression led to coordinated assembly of virus-like particles (VLPs) that were morphologically and physically distinct from M-only or F-only VLPs. Mutations to the F protein transmembrane domain or cytoplasmic tail that disrupted endocytic trafficking led to failure of F to function with M for VLP assembly. Wild-type F functioned normally for VLP assembly even when its cleavage was prevented with a cathepsin inhibitor, indicating that it is endocytic F trafficking that is important for VLP assembly, not proteolytic F cleavage. Under specific conditions of reduced M expression, we found that M could no longer induce significant VLP release but retained the ability to be incorporated as a passenger into F-driven VLPs, provided that the F protein was competent for endocytic trafficking. The F and M proteins were both found to traffic through Rab11-positive recycling endosomes (REs), suggesting a model in which F and M trafficking pathways converge at REs, enabling these proteins to preassemble before arriving at plasma membrane budding sites.IMPORTANCE Hendra virus and Nipah virus are zoonotic paramyxoviruses that cause lethal infections in humans. Unlike that for most paramyxoviruses, activation of the henipavirus fusion protein occurs in recycling endosomal compartments. In this study, we demonstrate that the unique endocytic trafficking pathway of Hendra virus F protein is required for proper viral assembly and particle release. These results advance our basic understanding of the henipavirus assembly process and provide a novel model for the interplay between glycoprotein trafficking and paramyxovirus assembly.
Collapse
|
45
|
Kim JO, Kim JO, Kim WS, Oh MJ. Characterization of the Transcriptome and Gene Expression of Brain Tissue in Sevenband Grouper (Hyporthodus septemfasciatus) in Response to NNV Infection. Genes (Basel) 2017; 8:genes8010031. [PMID: 28098800 PMCID: PMC5295026 DOI: 10.3390/genes8010031] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Revised: 01/07/2017] [Accepted: 01/09/2017] [Indexed: 12/21/2022] Open
Abstract
Grouper is one of the favorite sea food resources in Southeast Asia. However, the outbreaks of the viral nervous necrosis (VNN) disease due to nervous necrosis virus (NNV) infection have caused mass mortality of grouper larvae. Many aqua-farms have suffered substantial financial loss due to the occurrence of VNN. To better understand the infection mechanism of NNV, we performed the transcriptome analysis of sevenband grouper brain tissue, the main target of NNV infection. After artificial NNV challenge, transcriptome of brain tissues of sevenband grouper was subjected to next generation sequencing (NGS) using an Illumina Hi-seq 2500 system. Both mRNAs from pooled samples of mock and NNV-infected sevenband grouper brains were sequenced. Clean reads of mock and NNV-infected samples were de novo assembled and obtained 104,348 unigenes. In addition, 628 differentially expressed genes (DEGs) in response to NNV infection were identified. This result could provide critical information not only for the identification of genes involved in NNV infection, but for the understanding of the response of sevenband groupers to NNV infection.
Collapse
Affiliation(s)
- Jong-Oh Kim
- Department of Aqualife Medicine, College of Fisheries and Ocean Science, Chonnam National University, Yeosu 550-749, Korea.
| | - Jae-Ok Kim
- Department of Aqualife Medicine, College of Fisheries and Ocean Science, Chonnam National University, Yeosu 550-749, Korea.
| | - Wi-Sik Kim
- Department of Aqualife Medicine, College of Fisheries and Ocean Science, Chonnam National University, Yeosu 550-749, Korea.
| | - Myung-Joo Oh
- Department of Aqualife Medicine, College of Fisheries and Ocean Science, Chonnam National University, Yeosu 550-749, Korea.
| |
Collapse
|
46
|
Xu X, Greenland JR, Gotts JE, Matthay MA, Caughey GH. Cathepsin L Helps to Defend Mice from Infection with Influenza A. PLoS One 2016; 11:e0164501. [PMID: 27716790 PMCID: PMC5055332 DOI: 10.1371/journal.pone.0164501] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Accepted: 09/26/2016] [Indexed: 02/03/2023] Open
Abstract
Host-derived proteases can augment or help to clear infections. This dichotomy is exemplified by cathepsin L (CTSL), which helps Hendra virus and SARS coronavirus to invade cells, but is essential for survival in mice with mycoplasma pneumonia. The present study tested the hypothesis that CTSL protects mice from serious consequences of infection by the orthomyxovirus influenza A, which is thought to be activated by host-supplied proteases other than CTSL. Ctsl-/- mice infected with influenza A/Puerto Rico/8/34(H1N1) had larger lung viral loads and higher mortality than infected Ctsl+/+ mice. Lung inflammation in surviving infected mice peaked 14 days after initial infection, accompanied marked focal distal airway bronchiolization and epithelial metaplasia followed by desquamation and fibrotic interstitial remodeling, and persisted for at least 6 weeks. Most deaths occurred during the second week of infection in both groups of mice. In contrast to mycoplasma pneumonia, infiltrating cells were predominantly mononuclear rather than polymorphonuclear. The histopathology of lung inflammation and remodeling in survivors was similar in Ctsl-/- and Ctsl+/+ mice, although Ctsl+/+ mice cleared immunoreactive virus sooner. Furthermore, Ctsl-/- mice had profound deficits in CD4+ lymphocytes before and after infection and weaker production of pathogen-specific IgG. Thus, CTSL appears to support innate as well as adaptive responses, which confer a survival advantage on mice infected with the orthomyxovirus influenza A.
Collapse
Affiliation(s)
- Xiang Xu
- Department of Medicine, University of California at San Francisco, San Francisco, California, United States of America
| | - John R. Greenland
- Department of Medicine, University of California at San Francisco, San Francisco, California, United States of America
- Veterans Affairs Medical Center, San Francisco, California, United States of America
| | - Jeffrey E. Gotts
- Department of Medicine, University of California at San Francisco, San Francisco, California, United States of America
- Cardiovascular Research Institute, University of California at San Francisco, San Francisco, California, United States of America
| | - Michael A. Matthay
- Department of Medicine, University of California at San Francisco, San Francisco, California, United States of America
- Cardiovascular Research Institute, University of California at San Francisco, San Francisco, California, United States of America
| | - George H. Caughey
- Department of Medicine, University of California at San Francisco, San Francisco, California, United States of America
- Veterans Affairs Medical Center, San Francisco, California, United States of America
- Cardiovascular Research Institute, University of California at San Francisco, San Francisco, California, United States of America
- * E-mail:
| |
Collapse
|
47
|
Broder CC, Weir DL, Reid PA. Hendra virus and Nipah virus animal vaccines. Vaccine 2016; 34:3525-34. [PMID: 27154393 DOI: 10.1016/j.vaccine.2016.03.075] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Revised: 12/30/2015] [Accepted: 03/11/2016] [Indexed: 01/07/2023]
Abstract
Hendra virus (HeV) and Nipah virus (NiV) are zoonotic viruses that emerged in the mid to late 1990s causing disease outbreaks in livestock and people. HeV appeared in Queensland, Australia in 1994 causing a severe respiratory disease in horses along with a human case fatality. NiV emerged a few years later in Malaysia and Singapore in 1998-1999 causing a large outbreak of encephalitis with high mortality in people and also respiratory disease in pigs which served as amplifying hosts. The key pathological elements of HeV and NiV infection in several species of mammals, and also in people, are a severe systemic and often fatal neurologic and/or respiratory disease. In people, both HeV and NiV are also capable of causing relapsed encephalitis following recovery from an acute infection. The known reservoir hosts of HeV and NiV are several species of pteropid fruit bats. Spillovers of HeV into horses continue to occur in Australia and NiV has caused outbreaks in people in Bangladesh and India nearly annually since 2001, making HeV and NiV important transboundary biological threats. NiV in particular possesses several features that underscore its potential as a pandemic threat, including its ability to infect humans directly from natural reservoirs or indirectly from other susceptible animals, along with a capacity of limited human-to-human transmission. Several HeV and NiV animal challenge models have been developed which have facilitated an understanding of pathogenesis and allowed for the successful development of both active and passive immunization countermeasures.
Collapse
Affiliation(s)
- Christopher C Broder
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD, 20814, United States.
| | - Dawn L Weir
- Navy Environmental and Preventive Medicine Unit Six, Joint Base Pearl Harbor Hickam, HI, 96860, United States
| | - Peter A Reid
- Equine Veterinary Surgeon, Brisbane, Queensland, 4034, Australia
| |
Collapse
|
48
|
White JM, Whittaker GR. Fusion of Enveloped Viruses in Endosomes. Traffic 2016; 17:593-614. [PMID: 26935856 PMCID: PMC4866878 DOI: 10.1111/tra.12389] [Citation(s) in RCA: 259] [Impact Index Per Article: 32.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2016] [Revised: 02/25/2016] [Accepted: 02/25/2016] [Indexed: 12/12/2022]
Abstract
Ari Helenius launched the field of enveloped virus fusion in endosomes with a seminal paper in the Journal of Cell Biology in 1980. In the intervening years, a great deal has been learned about the structures and mechanisms of viral membrane fusion proteins as well as about the endosomes in which different enveloped viruses fuse and the endosomal cues that trigger fusion. We now recognize three classes of viral membrane fusion proteins based on structural criteria and four mechanisms of fusion triggering. After reviewing general features of viral membrane fusion proteins and viral fusion in endosomes, we delve into three characterized mechanisms for viral fusion triggering in endosomes: by low pH, by receptor binding plus low pH and by receptor binding plus the action of a protease. We end with a discussion of viruses that may employ novel endosomal fusion‐triggering mechanisms. A key take‐home message is that enveloped viruses that enter cells by fusing in endosomes traverse the endocytic pathway until they reach an endosome that has all of the environmental conditions (pH, proteases, ions, intracellular receptors and lipid composition) to (if needed) prime and (in all cases) trigger the fusion protein and to support membrane fusion.
Collapse
Affiliation(s)
- Judith M White
- Department of Cell Biology, University of Virginia, Charlottesville, VA, USA
| | - Gary R Whittaker
- Department of Microbiology & Immunology, Cornell University, Ithaca, NY, USA
| |
Collapse
|
49
|
Stone JA, Nicola AV, Baum LG, Aguilar HC. Multiple Novel Functions of Henipavirus O-glycans: The First O-glycan Functions Identified in the Paramyxovirus Family. PLoS Pathog 2016; 12:e1005445. [PMID: 26867212 PMCID: PMC4750917 DOI: 10.1371/journal.ppat.1005445] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Accepted: 01/19/2016] [Indexed: 01/13/2023] Open
Abstract
O-linked glycosylation is a ubiquitous protein modification in organisms belonging to several kingdoms. Both microbial and host protein glycans are used by many pathogens for host invasion and immune evasion, yet little is known about the roles of O-glycans in viral pathogenesis. Reportedly, there is no single function attributed to O-glycans for the significant paramyxovirus family. The paramyxovirus family includes many important pathogens, such as measles, mumps, parainfluenza, metapneumo- and the deadly Henipaviruses Nipah (NiV) and Hendra (HeV) viruses. Paramyxoviral cell entry requires the coordinated actions of two viral membrane glycoproteins: the attachment (HN/H/G) and fusion (F) glycoproteins. O-glycan sites in HeV G were recently identified, facilitating use of the attachment protein of this deadly paramyxovirus as a model to study O-glycan functions. We mutated the identified HeV G O-glycosylation sites and found mutants with altered cell-cell fusion, G conformation, G/F association, viral entry in a pseudotyped viral system, and, quite unexpectedly, pseudotyped viral F protein incorporation and processing phenotypes. These are all important functions of viral glycoproteins. These phenotypes were broadly conserved for equivalent NiV mutants. Thus our results identify multiple novel and pathologically important functions of paramyxoviral O-glycans, paving the way to study O-glycan functions in other paramyxoviruses and enveloped viruses. Glycosylation is a protein modification process that occurs inside cells, in which specific types of sugars (glycans) are added to certain amino acids in some proteins. Glycosylation happens for many organisms, from microbes to mammals, including many pathogens. Altered glycosylation is increasingly being associated with auto-immune diseases and cancer, highlighting the need to better understand glycosylation. There are two types of sugars added during the glycosylation process: N-glycans and O-glycans. While the roles of N-glycans have been extensively reported for many organisms, the roles of O-glycans remain largely unknown, particularly for viruses. The paramyxoviruses are a medically important family of viruses that include the highly lethal Hendra (HeV) and Nipah (NiV) viruses. Viral entry into host cells and spread from cell to cell relies on two viral proteins: G and F. Here we mutated known O-glycan locations in the HeV and NiV G proteins. Loss of O-glycans affected several viral processes crucial to viral entry and spread from cell to cell. Our results are the first reported functions for paramyxoviral O-glycans, contributing to the field of viral entry and spread, and helping pave the way for future functional studies in other pathogens.
Collapse
Affiliation(s)
- Jacquelyn A. Stone
- Paul G. Allen School for Global Animal Health, Washington State University, Pullman, Washington, United States of America
| | - Anthony V. Nicola
- Paul G. Allen School for Global Animal Health, Washington State University, Pullman, Washington, United States of America
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington, United States of America
| | - Linda G. Baum
- Department of Pathology and Laboratory Medicine, University of California, Los Angeles, California, United States of America
| | - Hector C. Aguilar
- Paul G. Allen School for Global Animal Health, Washington State University, Pullman, Washington, United States of America
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington, United States of America
- * E-mail:
| |
Collapse
|
50
|
Markosyan RM, Miao C, Zheng YM, Melikyan GB, Liu SL, Cohen FS. Induction of Cell-Cell Fusion by Ebola Virus Glycoprotein: Low pH Is Not a Trigger. PLoS Pathog 2016; 12:e1005373. [PMID: 26730950 PMCID: PMC4711667 DOI: 10.1371/journal.ppat.1005373] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Accepted: 12/08/2015] [Indexed: 12/11/2022] Open
Abstract
Ebola virus (EBOV) is a highly pathogenic filovirus that causes hemorrhagic fever in humans and animals. Currently, how EBOV fuses its envelope membrane within an endosomal membrane to cause infection is poorly understood. We successfully measure cell-cell fusion mediated by the EBOV fusion protein, GP, assayed by the transfer of both cytoplasmic and membrane dyes. A small molecule fusion inhibitor, a neutralizing antibody, as well as mutations in EBOV GP known to reduce viral infection, all greatly reduce fusion. By monitoring redistribution of small aqueous dyes between cells and by electrical capacitance measurements, we discovered that EBOV GP-mediated fusion pores do not readily enlarge—a marked difference from the behavior of other viral fusion proteins. EBOV GP must be cleaved by late endosome-resident cathepsins B or L in order to become fusion-competent. Cleavage of cell surface-expressed GP appears to occur in endosomes, as evidenced by the fusion block imposed by cathepsin inhibitors, agents that raise endosomal pH, or an inhibitor of anterograde trafficking. Treating effector cells with a recombinant soluble cathepsin B or thermolysin, which cleaves GP into an active form, increases the extent of fusion, suggesting that a fraction of surface-expressed GP is not cleaved. Whereas the rate of fusion is increased by a brief exposure to acidic pH, fusion does occur at neutral pH. Importantly, the extent of fusion is independent of external pH in experiments in which cathepsin activity is blocked and EBOV GP is cleaved by thermolysin. These results imply that low pH promotes fusion through the well-known pH-dependent activity of cathepsins; fusion induced by cleaved EBOV GP is a process that is fundamentally independent of pH. The cell-cell fusion system has revealed some previously unappreciated features of EBOV entry, which could not be readily elucidated in the context of endosomal entry. The devastation and transmissibility of Ebola virus (EBOV) are well known. However, the manner in which EBOV enters host cells through endosomal membrane remains elusive. Here, we have developed a convenient experimental system to mimic EBOV fusion in endosomes: cells expressing the fusion protein of EBOV, GP, on their surface are fused to target cells. This system exhibits the known key properties of EBOV fusion. We show that the pH-dependence of EBOV fusion is caused by the pH-dependence of cathepsins, proteases known to cleave EBOV GP into a fusion-competent form. We demonstrate that the fusion activity of this cleaved form is independent of pH. We further show that the enlargement of the fusion pore created by EBOV GP is unusually slow in reaching sizes necessary to pass EBOV’s genome—this is atypical of virally created fusion pores. This cell-cell fusion system should provide a useful platform for developing drugs against EBOV infection.
Collapse
Affiliation(s)
- Ruben M. Markosyan
- Rush University Medical Center, Department of Molecular Biophysics and Physiology, Chicago, Illinois, United States of America
| | - Chunhui Miao
- University of Missouri School of Medicine, Bond Life Sciences Center, Department of Molecular Microbiology and Immunology, Columbia, Missouri, United States of America
| | - Yi-Min Zheng
- University of Missouri School of Medicine, Bond Life Sciences Center, Department of Molecular Microbiology and Immunology, Columbia, Missouri, United States of America
| | - Gregory B. Melikyan
- Emory University Medical School, Department of Pediatrics, Infectious Diseases, Atlanta, Georgia, United States of America
| | - Shan-Lu Liu
- University of Missouri School of Medicine, Bond Life Sciences Center, Department of Molecular Microbiology and Immunology, Columbia, Missouri, United States of America
- * E-mail: (SLL); (FSC)
| | - Fredric S. Cohen
- Rush University Medical Center, Department of Molecular Biophysics and Physiology, Chicago, Illinois, United States of America
- * E-mail: (SLL); (FSC)
| |
Collapse
|