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Aymoz-Bressot T, Canis M, Meurisse F, Wijkhuisen A, Favier B, Mousseau G, Dupressoir A, Heidmann T, Bacquin A. Cell-Int: a cell-cell interaction assay to identify native membrane protein interactions. Life Sci Alliance 2024; 7:e202402844. [PMID: 39237366 PMCID: PMC11377309 DOI: 10.26508/lsa.202402844] [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: 05/27/2024] [Revised: 08/29/2024] [Accepted: 08/29/2024] [Indexed: 09/07/2024] Open
Abstract
Intercellular protein-protein interactions (PPIs) have pivotal roles in biological functions and diseases. Membrane proteins are therefore a major class of drug targets. However, studying such intercellular PPIs is challenging because of the properties of membrane proteins. Current methods commonly use purified or modified proteins that are not physiologically relevant and hence might mischaracterize interactions occurring in vivo. Here, we describe Cell-Int: a cell interaction assay for studying plasma membrane PPIs. The interaction signal is measured through conjugate formation between two populations of cells each expressing either a ligand or a receptor. In these settings, membrane proteins are in their native environment thus being physiologically relevant. Cell-Int has been applied to the study of diverse protein partners, and enables to investigate the inhibitory potential of blocking antibodies, as well as the retargeting of fusion proteins for therapeutic development. The assay was also validated for screening applications and could serve as a platform for identifying new protein interactors.
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Affiliation(s)
- Thibaud Aymoz-Bressot
- CNRS UMR9196, Laboratory of Molecular Physiology and Pathology of Endogenous and Infectious Retroviruses, Gustave Roussy, Université Paris-Saclay, Villejuif, France
| | - Marie Canis
- CNRS UMR9196, Laboratory of Molecular Physiology and Pathology of Endogenous and Infectious Retroviruses, Gustave Roussy, Université Paris-Saclay, Villejuif, France
- VIROXIS, Gustave Roussy, Villejuif, France
| | - Florian Meurisse
- Université Paris-Saclay, Inserm, CEA, Center for Immunology of Viral, Auto-immune, Hematological and Bacterial Diseases (IMVA-HB/IDMIT), Paris, France
| | - Anne Wijkhuisen
- Université Paris-Saclay, CEA, INRAE, Médicaments et Technologies pour la Santé (MTS), Gif-sur-Yvette, France
| | - Benoit Favier
- Université Paris-Saclay, Inserm, CEA, Center for Immunology of Viral, Auto-immune, Hematological and Bacterial Diseases (IMVA-HB/IDMIT), Paris, France
| | | | - Anne Dupressoir
- CNRS UMR9196, Laboratory of Molecular Physiology and Pathology of Endogenous and Infectious Retroviruses, Gustave Roussy, Université Paris-Saclay, Villejuif, France
| | - Thierry Heidmann
- CNRS UMR9196, Laboratory of Molecular Physiology and Pathology of Endogenous and Infectious Retroviruses, Gustave Roussy, Université Paris-Saclay, Villejuif, France
- VIROXIS, Gustave Roussy, Villejuif, France
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2
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Tailoring Uptake Efficacy of HSV-1 gD Derived Carrier Peptides. Biomolecules 2020; 10:biom10050721. [PMID: 32384673 PMCID: PMC7277387 DOI: 10.3390/biom10050721] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 04/24/2020] [Accepted: 05/01/2020] [Indexed: 12/25/2022] Open
Abstract
Regions of the Herpes simplex virus-1 (HSV-1) glycoprotein D (gD) were chosen to design carrier peptides based on the known tertiary structure of the virus entry receptor complexes. These complexes consist of the following: HSV-1 gD–nectin-1 and HSV-1 gD–herpesvirus entry mediator (HVEM). Three sets of peptides were synthesised with sequences covering the (i) N-terminal HVEM- and nectin-1 binding region -5–42, (ii) the 181–216 medium region containing nectin-1 binding sequences and (iii) the C-terminal nectin-1 binding region 214–255. The carrier candidates were prepared with acetylated and 5(6)-carboxyfluorescein labelled N-termini. The peptides were chemically characterised and their conformational features in solution were also determined. In vitro internalisation profile and intracellular localisation were evaluated on SH-SY5Y neuroblastoma cells. Peptide originated from the C-terminal region 224–247 of the HSV-1 gD showed remarkable internalisation compared to the other peptides with low to moderate entry. Electronic circular dichroism secondary structure studies of the peptides revealed that the most effectively internalised peptides exhibit high helical propensity at increasing TFE concentrations. We proved that oligopeptides derived from the nectin-1 binding region are promising candidates—with possibility of Lys237Arg and/or Trp241Phe substitutions—for side-reaction free conjugation of bioactive compounds—drugs or gene therapy agents—as cargos.
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3
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Russell SJ, Babovic-Vuksanovic D, Bexon A, Cattaneo R, Dingli D, Dispenzieri A, Deyle DR, Federspiel MJ, Fielding A, Galanis E, Lacy MQ, Leibovich BC, Liu MC, Muñoz-Alía M, Miest TC, Molina JR, Mueller S, Okuno SH, Packiriswamy N, Peikert T, Raffel C, Van Rhee F, Ungerechts G, Young PR, Zhou Y, Peng KW. Oncolytic Measles Virotherapy and Opposition to Measles Vaccination. Mayo Clin Proc 2019; 94:1834-1839. [PMID: 31235278 PMCID: PMC6800178 DOI: 10.1016/j.mayocp.2019.05.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2019] [Revised: 05/07/2019] [Accepted: 05/08/2019] [Indexed: 12/19/2022]
Abstract
Recent measles epidemics in US and European cities where vaccination coverage has declined are providing a harsh reminder for the need to maintain protective levels of immunity across the entire population. Vaccine uptake rates have been declining in large part because of public misinformation regarding a possible association between measles vaccination and autism for which there is no scientific basis. The purpose of this article is to address a new misinformed antivaccination argument-that measles immunity is undesirable because measles virus is protective against cancer. Having worked for many years to develop engineered measles viruses as anticancer therapies, we have concluded (1) that measles is not protective against cancer and (2) that its potential utility as a cancer therapy will be enhanced, not diminished, by prior vaccination.
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Affiliation(s)
- Stephen J Russell
- Department of Molecular Medicine, Mayo Clinic, Rochester, MN; Division of Hematology, Mayo Clinic, Rochester, MN.
| | | | | | | | - David Dingli
- Department of Molecular Medicine, Mayo Clinic, Rochester, MN; Division of Hematology, Mayo Clinic, Rochester, MN
| | | | - David R Deyle
- Division of Medical Genetics, Mayo Clinic, Rochester, MN
| | | | - Adele Fielding
- Department of Hematology, UCL Cancer Institute, London, UK
| | - Eva Galanis
- Department of Molecular Medicine, Mayo Clinic, Rochester, MN; Division of Medical Oncology, Mayo Clinic, Rochester, MN
| | | | | | - Minetta C Liu
- Division of Medical Oncology, Mayo Clinic, Rochester, MN
| | | | | | | | - Sabine Mueller
- Department of Neurology, University of California, San Francisco
| | - Scott H Okuno
- Division of Medical Oncology, Mayo Clinic, Rochester, MN
| | | | - Tobias Peikert
- Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, MN
| | - Corey Raffel
- Department of Neurology, University of California, San Francisco
| | - Frits Van Rhee
- UAMS Myeloma Center, University of Arkansas for Medical Sciences, Little Rock
| | - Guy Ungerechts
- Department of Medical Oncology, University Hospital Heidelberg, Heidelberg, Germany
| | - Paul R Young
- Department of Urology, Mayo Clinic, Jacksonville, FL
| | - Yumei Zhou
- Department of Molecular Medicine, Mayo Clinic, Rochester, MN
| | - Kah-Whye Peng
- Department of Molecular Medicine, Mayo Clinic, Rochester, MN
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4
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Fernandes J. Oncogenes: The Passport for Viral Oncolysis Through PKR Inhibition. BIOMARKERS IN CANCER 2016; 8:101-10. [PMID: 27486347 PMCID: PMC4966488 DOI: 10.4137/bic.s33378] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/26/2016] [Revised: 06/28/2016] [Accepted: 07/07/2016] [Indexed: 02/07/2023]
Abstract
The transforming properties of oncogenes are derived from gain-of-function mutations, shifting cell signaling from highly regulated homeostatic to an uncontrolled oncogenic state, with the contribution of the inactivating mutations in tumor suppressor genes P53 and RB, leading to tumor resistance to conventional and target-directed therapy. On the other hand, this scenario fulfills two requirements for oncolytic virus infection in tumor cells: inactivation of tumor suppressors and presence of oncoproteins, also the requirements to engage malignancy. Several of these oncogenes have a negative impact on the main interferon antiviral defense, the double-stranded RNA-activated protein kinase (PKR), which helps viruses to spontaneously target tumor cells instead of normal cells. This review is focused on the negative impact of overexpression of oncogenes on conventional and targeted therapy and their positive impact on viral oncolysis due to their ability to inhibit PKR-induced translation blockage, allowing virion release and cell death.
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Affiliation(s)
- Janaina Fernandes
- NUMPEX-BIO, Campus Xerém, Federal University of Rio de Janeiro, Duque de Caxias, Rio de Janeiro, Brazil.; Institute for Translational Research on Health and Environment in the Amazon Region-INPeTAm, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
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5
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Ichiyama K, Yang C, Chandrasekaran L, Liu S, Rong L, Zhao Y, Gao S, Lee A, Ohba K, Suzuki Y, Yoshinaka Y, Shimotohno K, Miyakawa K, Ryo A, Hedrick J, Yamamoto N, Yang YY. Cooperative Orthogonal Macromolecular Assemblies with Broad Spectrum Antiviral Activity, High Selectivity, and Resistance Mitigation. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b00091] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Koji Ichiyama
- Translational
ID Lab, Department of Microbiology, Yong Loo Lin School of Medicine, National University of Singapore, 14 Medical Drive, #15-02 Centre for Translational
Medicine (MD6), Singapore 117599, Singapore
| | - Chuan Yang
- Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, Singapore 138669, Singapore
| | - Lakshmi Chandrasekaran
- Translational
ID Lab, Department of Microbiology, Yong Loo Lin School of Medicine, National University of Singapore, 14 Medical Drive, #15-02 Centre for Translational
Medicine (MD6), Singapore 117599, Singapore
| | - Shaoqiong Liu
- Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, Singapore 138669, Singapore
| | - Lijun Rong
- Department
of Microbiology and Immunology (M/C 790), University of Illinois at Chicago, 835 S. Wolcott, Chicago, Illinois 60612, United States
| | - Yue Zhao
- Department
of Microbiology and Immunology (M/C 790), University of Illinois at Chicago, 835 S. Wolcott, Chicago, Illinois 60612, United States
| | - Shujun Gao
- Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, Singapore 138669, Singapore
| | - Ashlynn Lee
- Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, Singapore 138669, Singapore
| | - Kenji Ohba
- Translational
ID Lab, Department of Microbiology, Yong Loo Lin School of Medicine, National University of Singapore, 14 Medical Drive, #15-02 Centre for Translational
Medicine (MD6), Singapore 117599, Singapore
| | - Youichi Suzuki
- Translational
ID Lab, Department of Microbiology, Yong Loo Lin School of Medicine, National University of Singapore, 14 Medical Drive, #15-02 Centre for Translational
Medicine (MD6), Singapore 117599, Singapore
| | - Yoshiyuki Yoshinaka
- Department
of Molecular Virology, Tokyo Medical and Dental University, Tokyo 113-8510, Japan
| | - Kunitada Shimotohno
- The
Research Center for Hepatitis and Immunology, National Center for Global Health and Medicine, 1-7-1, Kohnodai, Ichikawa,
Chiba 272-8516, Japan
| | - Kei Miyakawa
- Department
of Microbiology, Yokohama City University School of Medicine, Kanagawa 236-0004, Japan
| | - Akihide Ryo
- Department
of Microbiology, Yokohama City University School of Medicine, Kanagawa 236-0004, Japan
| | - James Hedrick
- IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, United States
| | - Naoki Yamamoto
- Translational
ID Lab, Department of Microbiology, Yong Loo Lin School of Medicine, National University of Singapore, 14 Medical Drive, #15-02 Centre for Translational
Medicine (MD6), Singapore 117599, Singapore
| | - Yi Yan Yang
- Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, Singapore 138669, Singapore
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6
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Liu D, Auguste DT. Cancer targeted therapeutics: From molecules to drug delivery vehicles. J Control Release 2015; 219:632-643. [PMID: 26342659 DOI: 10.1016/j.jconrel.2015.08.041] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 08/19/2015] [Accepted: 08/20/2015] [Indexed: 02/07/2023]
Abstract
The pitfall of all chemotherapeutics lies in drug resistance and the severe side effects experienced by patients. One way to reduce the off-target effects of chemotherapy on healthy tissues is to alter the biodistribution of drug. This can be achieved in two ways: Passive targeting utilizes shape, size, and surface chemistry to increase particle circulation and tumor accumulation. Active targeting employs either chemical moieties (e.g. peptides, sugars, aptamers, antibodies) to selectively bind to cell membranes or responsive elements (e.g. ultrasound, magnetism, light) to deliver its cargo within a local region. This article will focus on the systemic administration of anti-cancer agents and their ability to home to tumors and, if relevant, distant metastatic sites.
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Affiliation(s)
- Daxing Liu
- Department of Biomedical Engineering, The City College of New York, New York, NY 10031, United States
| | - Debra T Auguste
- Department of Biomedical Engineering, The City College of New York, New York, NY 10031, United States.
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7
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MicroRNA-mediated multi-tissue detargeting of oncolytic measles virus. Cancer Gene Ther 2014; 21:373-80. [PMID: 25145311 DOI: 10.1038/cgt.2014.40] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2014] [Revised: 07/06/2014] [Accepted: 07/07/2014] [Indexed: 02/07/2023]
Abstract
Precise oncotropism is required for successful systemic administration of next-generation oncolytic measles viruses (MVs). We have previously established a system for efficient post-entry targeting by insertion of synthetic microRNA target sites (miRTS) into the MV genome, thereby repressing replication in the presence of cognate microRNAs. Thus, differential expression of microRNAs, as frequently observed in normal compared with malignant tissues, can be exploited to increase vector specificity and safety. Here we report the combination of miRTS for different microRNAs in a single vector to detarget pivotal organs at risk during systemic administration (liver, brain, gastrointestinal tract). Accordingly, miRTS for miR-122, miR-7 and miR-148a that are enriched in these tissues were inserted to create multi-tissue-detargeted MV (MV-EGFP(mtd)). Replication of MV-EGFP(mtd) is repressed in cell lines as well as in non-transformed primary human hepatocytes and liver slices expressing cognate microRNAs. Oncolytic potency of MV-EGFP(mtd) is retained in a model of pancreatic cancer in vitro and in vivo. This work is a proof-of-concept that favorable expression profiles of multiple microRNAs can be exploited concomitantly to reshape the tropism of MV without compromising oncolytic efficacy. This strategy can be adapted to different vectors and cancer entities for safe and efficient high-dose systemic administration in clinical trials.
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8
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Abstract
The virus particles described in previous chapters are vehicles that transmit the viral genome and the infection from cell to cell. To initiate the infective cycle, the viral genome must therefore translocate from the viral particle to the cytoplasm. Via distinct proteins or motifs in their outermost shell, the particles attach initially to specific molecules on the host cell surface. These virus receptors thus mediate penetration of the viral genome inside the cell, where the intracellular infective cycle starts. The presence of these receptors on the cell surface is a principal determinant of virus host tropism. Viruses can use diverse types of molecules to attach to and enter into cells. In addition, virus-receptor recognition can evolve over the course of an infection, and virus variants with distinct receptor-binding specificities and tropism can appear. The identification of virus receptors and the characterization of virus-receptor interactions have been major research goals in virology for the last two decades. In this chapter, we will describe, from a structural perspective, several virus-receptor interactions and the active role of receptor molecules in virus entry.
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9
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Mateo M, Navaratnarajah CK, Cattaneo R. Structural basis of efficient contagion: measles variations on a theme by parainfluenza viruses. Curr Opin Virol 2014; 5:16-23. [PMID: 24492202 PMCID: PMC4028398 DOI: 10.1016/j.coviro.2014.01.004] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 11/26/2013] [Accepted: 01/08/2014] [Indexed: 11/19/2022]
Abstract
A quartet of attachment proteins and a trio of fusion protein subunits play the cell entry concert of parainfluenza viruses. While many of these viruses bind sialic acid to enter cells, wild type measles binds exclusively two tissue-specific proteins, the lymphatic receptor signaling lymphocytic activation molecule (SLAM), and the epithelial receptor nectin-4. SLAM binds near the stalk-head junction of the hemagglutinin. Nectin-4 binds a hydrophobic groove located between blades 4 and 5 of the hemagglutinin β-propeller head. The mutated vaccine strain hemagglutinin binds in addition the ubiquitous protein CD46, which explains attenuation. The measles virus entry concert has four movements. Andante misterioso: the virus takes over the immune system. Allegro con brio: it rapidly spreads in the upper airway's epithelia. 'Targeting' fugue: the versatile orchestra takes off. Presto furioso: the virus exits the host with thunder. Be careful: music is contagious.
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MESH Headings
- Animals
- Antigens, CD/chemistry
- Antigens, CD/genetics
- Antigens, CD/metabolism
- Cell Adhesion Molecules/chemistry
- Cell Adhesion Molecules/genetics
- Cell Adhesion Molecules/metabolism
- Hemagglutinins, Viral/chemistry
- Hemagglutinins, Viral/genetics
- Hemagglutinins, Viral/metabolism
- Humans
- Measles/genetics
- Measles/metabolism
- Measles/virology
- Measles virus/chemistry
- Measles virus/genetics
- Measles virus/metabolism
- Protein Binding
- Receptors, Cell Surface/chemistry
- Receptors, Cell Surface/genetics
- Receptors, Cell Surface/metabolism
- Receptors, Virus/chemistry
- Receptors, Virus/genetics
- Receptors, Virus/metabolism
- Signaling Lymphocytic Activation Molecule Family Member 1
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Affiliation(s)
- Mathieu Mateo
- Department of Molecular Medicine, Mayo Clinic, and Virology and Gene Therapy Track, Mayo Graduate School, 200 First Street SW, Rochester, MN 55905, USA
| | - Chanakha K Navaratnarajah
- Department of Molecular Medicine, Mayo Clinic, and Virology and Gene Therapy Track, Mayo Graduate School, 200 First Street SW, Rochester, MN 55905, USA
| | - Roberto Cattaneo
- Department of Molecular Medicine, Mayo Clinic, and Virology and Gene Therapy Track, Mayo Graduate School, 200 First Street SW, Rochester, MN 55905, USA.
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10
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The measles virus hemagglutinin stalk: structures and functions of the central fusion activation and membrane-proximal segments. J Virol 2014; 88:6158-67. [PMID: 24648460 DOI: 10.1128/jvi.02846-13] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
UNLABELLED The measles virus (MeV) membrane fusion apparatus consists of a fusion protein trimer and an attachment protein tetramer. To trigger membrane fusion, the heads of the MeV attachment protein, hemagglutinin (H), bind cellular receptors while the 96-residue-long H stalk transmits the triggering signal. Structural and functional studies of the triggering mechanism of other paramyxoviruses suggest that receptor binding to their hemagglutinin-neuraminidase (HN) results in signal transmission through the central segments of their stalks. To gain insight into H-stalk structure and function, we individually replaced its residues with cysteine. We then assessed how stable the mutant proteins are, how efficiently they can be cross-linked by disulfide bonds, whether cross-linking results in loss of function, and, in this case, whether disulfide bond reduction restores function. While many residues in the central segment of the stalk and in the spacer segment above it can be efficiently cross-linked by engineered disulfide bonds, we report here that residues 59 to 79 cannot, suggesting that the 20 membrane-proximal residues are not engaged in a tetrameric structure. Rescue-of-function studies by disulfide bond reduction resulted in the redefinition and extension of the central fusion-activation segment as covering residues 84 to 117. In particular, we identified four residues located between positions 92 and 99, the function of which cannot be restored by disulfide bond reduction after cysteine mutagenesis. These mutant H proteins reached the cell surface as complex oligomers but could not trigger membrane fusion. We discuss these observations in the context of the stalk exposure model of membrane fusion triggering by paramyxoviruses. IMPORTANCE Measles virus, while being targeted for eradication, still causes significant morbidity and mortality. Here, we seek to understand how it enters cells by membrane fusion. Two viral integral membrane glycoproteins (hemagglutinin tetramers and fusion protein trimers) mediate the concerted receptor recognition and membrane fusion processes. Since previous studies have suggested that the hemagglutinin stalk transmits the triggering signal to the fusion protein trimer, we completed an analysis of its structure and function by systematic Cys mutagenesis. We report that while certain residues of the central stalk segment confer specificity to the interaction with the fusion protein trimer, others are necessary to allow folding of the H-oligomer in a standard conformation conducive to fusion triggering, and still other residues sustain the conformational change that transmits the fusion-triggering signal.
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Abstract
Despite extensive research, current glioma therapies are still unsatisfactory, and novel approaches are pressingly needed. In recent years, both nonreplicative viral vectors and replicating oncolytic viruses have been developed for brain cancer treatment, and the mechanistic background of their cytotoxicity has been unveiled. A growing number of clinical trials have convincingly established viral therapies to be safe in glioma patients, and maximum tolerated doses have generally not been reached. However, evidence for therapeutic benefit has been limited: new generations of therapeutic vectors need to be developed in order to target not only tumor cells but also the complex surrounding microenvironment. Such therapies could also direct long-lasting immune responses toward the tumor while reducing early antiviral reactions. Furthermore, viral delivery methods are to be improved and viral spread within the tumor will have to be enhanced. Here, we will review the outcome of completed glioma virus therapy trials as well as highlight the ongoing clinical activities. On this basis, we will give an overview of the numerous strategies to enhance therapeutic efficacy of new-generation viruses and novel treatment regimens. Finally, we will conclude with approaches that may be crucial to the development of successful glioma therapies in the future.
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Affiliation(s)
| | - E. Antonio Chiocca
- Harvey Cushing Neuro-Oncology Laboratories, Department of Neurosurgery, Brigham and Women’s Hospital, Dana-Farber Cancer Institute and Harvard Medical School, Boston, Massachusetts
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12
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Abstract
Early-stage clinical trials of oncolytic virotherapy have reported the safety of several virus platforms, and viruses from three families have progressed to advanced efficacy trials. In addition, preclinical studies have established proof-of-principle for many new genetic engineering strategies. Thus, the virotherapy field now has available a diverse collection of viruses that are equipped to address unmet clinical needs owing to improved systemic administration, greater tumour specificity and enhanced oncolytic efficacy. The current key challenge for the field is to develop viruses that replicate with greater efficiency within tumours while achieving therapeutic synergy with currently available treatments.
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13
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Hydrophobic and charged residues in the central segment of the measles virus hemagglutinin stalk mediate transmission of the fusion-triggering signal. J Virol 2013; 87:10401-4. [PMID: 23864629 DOI: 10.1128/jvi.01547-13] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The pH-independent measles virus membrane fusion process begins when the attachment protein H binds to a receptor. Knowing that the central segment of the tetrameric H stalk transmits the signal to the fusion protein trimer, we investigated how. We document that exact conservation of most residues in the 92 through 99 segment is essential for function. In addition, hydrophobic and charged residues in the 104 through 125 segment, arranged with helical periodicity, are critical for F protein interactions and signal transmission.
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14
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Navaratnarajah CK, Negi S, Braun W, Cattaneo R. Membrane fusion triggering: three modules with different structure and function in the upper half of the measles virus attachment protein stalk. J Biol Chem 2012; 287:38543-51. [PMID: 23007387 DOI: 10.1074/jbc.m112.410563] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The measles virus (MV) fusion apparatus consists of a fusion protein and an attachment protein named hemagglutinin (H). After receptor-binding through its cuboidal head, the H-protein transmits the fusion-triggering signal through its stalk to the fusion protein. However, the structural basis of signal transmission is unclear because only structures of H-heads without their stalk have been solved. On the other hand, the entire ectodomain structure of the hemagglutinin-neuraminidase protein of another Paramyxovirus revealed a four-helix bundle stalk. To probe the structure of the 95-residue MV H-stalk we individually substituted head-proximal residues (positions 103-153) with cysteine, and biochemically and functionally characterized the resultant proteins. Our results indicate that most residues in the central segment (positions 103-117) can be cross-linked by engineered disulfide bonds, and thus may be engaged in a tetrameric structure. While covalent tetramerization disrupts fusion triggering function, disulfide bond reduction restores it in most positions except Asp-113. The next stalk segment (residues 123-138) also has high propensity to form covalent tetramers, but since these cross-links have little or no effect on function, it can conduct the fusion-triggering signal while remaining in a stabilized tetrameric configuration. This segment may act as a spacer, maintaining H-heads at an optimal height. Finally, the head-proximal segment (residues 139-154) has very limited propensity to trap tetramers, suggesting bifurcation into two flexible linkers clamped by inter-subunit covalent links formed by natural Cys-139 and Cys-154. We discuss the modular structure of the MV H-stalk in the context of membrane fusion triggering and cell entry by Paramyxoviruses.
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Affiliation(s)
- Chanakha K Navaratnarajah
- Department of Molecular Medicine, Mayo Clinic and Virology and Gene Therapy Track, Mayo Graduate School, Rochester, Minnesota 55905, USA
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15
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Herpes virus fusion and entry: a story with many characters. Viruses 2012; 4:800-32. [PMID: 22754650 PMCID: PMC3386629 DOI: 10.3390/v4050800] [Citation(s) in RCA: 254] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2012] [Revised: 05/04/2012] [Accepted: 05/09/2012] [Indexed: 12/13/2022] Open
Abstract
Herpesviridae comprise a large family of enveloped DNA viruses all of whom employ orthologs of the same three glycoproteins, gB, gH and gL. Additionally, herpesviruses often employ accessory proteins to bind receptors and/or bind the heterodimer gH/gL or even to determine cell tropism. Sorting out how these proteins function has been resolved to a large extent by structural biology coupled with supporting biochemical and biologic evidence. Together with the G protein of vesicular stomatitis virus, gB is a charter member of the Class III fusion proteins. Unlike VSV G, gB only functions when partnered with gH/gL. However, gH/gL does not resemble any known viral fusion protein and there is evidence that its function is to upregulate the fusogenic activity of gB. In the case of herpes simplex virus, gH/gL itself is upregulated into an active state by the conformational change that occurs when gD, the receptor binding protein, binds one of its receptors. In this review we focus primarily on prototypes of the three subfamilies of herpesviruses. We will present our model for how herpes simplex virus (HSV) regulates fusion in series of highly regulated steps. Our model highlights what is known and also provides a framework to address mechanistic questions about fusion by HSV and herpesviruses in general.
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16
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Viral and cellular contributions to herpes simplex virus entry into the cell. Curr Opin Virol 2012; 2:28-36. [DOI: 10.1016/j.coviro.2011.12.001] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Revised: 11/30/2011] [Accepted: 12/01/2011] [Indexed: 12/19/2022]
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