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Chianese A, Zannella C, Monti A, Doti N, Sanna G, Manzin A, De Filippis A, Galdiero M. Hylin-a1: A Pan-Inhibitor against Emerging and Re-Emerging Respiratory Viruses. Int J Mol Sci 2023; 24:13888. [PMID: 37762191 PMCID: PMC10531407 DOI: 10.3390/ijms241813888] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 09/04/2023] [Accepted: 09/08/2023] [Indexed: 09/29/2023] Open
Abstract
Pandemic and epidemic outbreaks of respiratory viruses are a challenge for public health and social care system worldwide, leading to high mortality and morbidity among the human populations. In light of the limited efficacy of current vaccines and antiviral drugs against respiratory viral infections and the emergence and re-emergence of new viruses, novel broad-spectrum antiviral drugs are needed for the prevention and treatment of these infections. Antimicrobial peptides with an antiviral effect, also known as AVPs, have already been reported as potent inhibitors of viral infections by affecting different stages of the virus lifecycle. In the present study, we analyzed the activity of the AVP Hylin-a1, secreted by the frog Hypsiboas albopunctatus, against a wide range of respiratory viruses, including the coronaviruses HCoV-229E and SARS-CoV-2, measles virus, human parainfluenza virus type 3, and influenza virus H1N1. We report a significant inhibitory effect on infectivity in all the enveloped viruses, whereas there was a lack of activity against the naked coxsackievirus B3. Considering the enormous therapeutic potential of Hylin-a1, further experiments are required to elucidate its mechanism of action and to increase its stability by modifying the native sequence.
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Affiliation(s)
- Annalisa Chianese
- Department of Experimental Medicine, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy; (A.C.); (C.Z.); (A.D.F.)
| | - Carla Zannella
- Department of Experimental Medicine, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy; (A.C.); (C.Z.); (A.D.F.)
| | - Alessandra Monti
- Institute of Biostructures and Bioimaging (IBB), National Research Council (CNR), 80131 Naples, Italy; (A.M.); (N.D.)
| | - Nunzianna Doti
- Institute of Biostructures and Bioimaging (IBB), National Research Council (CNR), 80131 Naples, Italy; (A.M.); (N.D.)
| | - Giuseppina Sanna
- Department of Biomedical Sciences, University of Cagliari, Cittadella Universitaria, 09042 Monserrato, Italy; (G.S.); (A.M.)
| | - Aldo Manzin
- Department of Biomedical Sciences, University of Cagliari, Cittadella Universitaria, 09042 Monserrato, Italy; (G.S.); (A.M.)
| | - Anna De Filippis
- Department of Experimental Medicine, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy; (A.C.); (C.Z.); (A.D.F.)
| | - Massimiliano Galdiero
- Department of Experimental Medicine, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy; (A.C.); (C.Z.); (A.D.F.)
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Bhat EA, Ali T, Sajjad N, Kumar R, Bron P. Insights into the structure, functional perspective, and pathogenesis of ZIKV: an updated review. Biomed Pharmacother 2023; 165:115175. [PMID: 37473686 DOI: 10.1016/j.biopha.2023.115175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Revised: 07/04/2023] [Accepted: 07/12/2023] [Indexed: 07/22/2023] Open
Abstract
Zika virus (ZIKV) poses a serious threat to the entire world. The rapid spread of ZIKV and recent outbreaks since 2007 have caused worldwide concern about the virus. Diagnosis is complicated because of the cross-reactivity of the virus with other viral antibodies. Currently, the virus is diagnosed by molecular techniques such as RT-PCR and IgM-linked enzyme immunoassays (MAC-ELISA). Recently, outbreaks and epidemics have been caused by ZIKV, and severe clinical symptoms and congenital malformations have also been associated with the virus. Although most ZIKV infections present with a subclinical or moderate flu-like course of illness, severe symptoms such as Guillain-Barre syndrome in adults and microcephaly in children of infected mothers have also been reported. Because there is no reliable cure for ZIKV and no vaccine is available, the public health response has focused primarily on preventing infection, particularly in pregnant women. A comprehensive approach is urgently needed to combat this infection and stop its spread and imminent threat. In view of this, this review aims to present the current structural and functional viewpoints, structure, etiology, clinical prognosis, and measures to prevent this transmission based on the literature and current knowledge. Moreover, we provide thorough description of the current understanding about ZIKV interaction with receptors, and a comparative examination of its similarities and differences with other viruses.
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Affiliation(s)
- Eijaz Ahmed Bhat
- CBS (Centre de Biologie Structurale), Univ. Montpellier, CNRS, INSERM, 29 rue de Navacelles, 34090 Montpellier, France.
| | - Tufail Ali
- Department of Biosciences, Jamia Millia Islamia, Jamia Nagar, New Delhi 110025, India
| | - Nasreena Sajjad
- Department of Biochemistry, University of Kashmir, Hazratbal, Jammu and Kashmir 190006, India
| | - Rohit Kumar
- Department of Plant Molecular Biology, University of Delhi South Campus, New Delhi 110021, India
| | - Patrick Bron
- CBS (Centre de Biologie Structurale), Univ. Montpellier, CNRS, INSERM, 29 rue de Navacelles, 34090 Montpellier, France.
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3
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Parra-Acevedo V, Ocazionez RE, Stashenko EE, Silva-Trujillo L, Rondón-Villarreal P. Comparative Virucidal Activities of Essential Oils and Alcohol-Based Solutions against Enveloped Virus Surrogates: In Vitro and In Silico Analyses. Molecules 2023; 28:molecules28104156. [PMID: 37241897 DOI: 10.3390/molecules28104156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 05/10/2023] [Accepted: 05/15/2023] [Indexed: 05/28/2023] Open
Abstract
The large-scale use of alcohol (OH)-based disinfectants to control pathogenic viruses is of great concern because of their side effects on humans and harmful impact on the environment. There is an urgent need to develop safe and environmentally friendly disinfectants. Essential oils (EOs) are generally recognized as safe (GRAS) by the FDA, and many exhibit strong antiviral efficacy against pathogenic human enveloped viruses. The present study investigated the virucidal disinfectant activity of solutions containing EO and OH against DENV-2 and CHIKV, which were used as surrogate viruses for human pathogenic enveloped viruses. The quantitative suspension test was used. A solution containing 12% EO + 10% OH reduced > 4.0 log10 TCID50 (100% reduction) of both viruses within 1 min of exposure. In addition, solutions containing 12% EO and 3% EO without OH reduced > 4.0 log10 TCID50 of both viruses after 10 min and 30 min of exposure, respectively. The binding affinities of 42 EO compounds and viral envelope proteins were investigated through docking analyses. Sesquiterpene showed the highest binding affinities (from -6.7 to -8.0 kcal/mol) with DENV-2 E and CHIKV E1-E2-E3 proteins. The data provide a first step toward defining the potential of EOs as disinfectants.
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Affiliation(s)
- Valentina Parra-Acevedo
- Centro de Cromatografía y Espectrometría de Masas-CROM-MASS, Universidad Industrial de Santander, Bucaramanga 680002, Colombia
| | - Raquel E Ocazionez
- Centro de Cromatografía y Espectrometría de Masas-CROM-MASS, Universidad Industrial de Santander, Bucaramanga 680002, Colombia
| | - Elena E Stashenko
- Centro de Cromatografía y Espectrometría de Masas-CROM-MASS, Universidad Industrial de Santander, Bucaramanga 680002, Colombia
| | - Lina Silva-Trujillo
- Centro de Cromatografía y Espectrometría de Masas-CROM-MASS, Universidad Industrial de Santander, Bucaramanga 680002, Colombia
| | - Paola Rondón-Villarreal
- Facultad de Ciencias Médicas y de la Salud, Instituto de Investigación Masira, Universidad de Santander, Bucaramanga 680003, Colombia
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Verma J, Hasan A, Sunil S, Subbarao N. In silico identification and in vitro antiviral validation of potential inhibitors against Chikungunya virus. J Comput Aided Mol Des 2022; 36:521-536. [PMID: 35789450 DOI: 10.1007/s10822-022-00463-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 06/21/2022] [Indexed: 11/29/2022]
Abstract
The Chikungunya virus (CHIKV) has become endemic in the Africa, Asia and Indian subcontinent, with its continuous re-emergence causing a significant public health crisis. The unavailability of specific antivirals and vaccines against the virus has highlighted an urgent need for novel therapeutics. In the present study, we have identified small molecule inhibitors targeting the envelope proteins of the CHIKV to interfere with the fusion process, eventually inhibiting the cell entry of the virus particles. We employed high throughput computational screening of large datasets against two different binding sites in the E1-E2 dimer to identify potential candidate inhibitors. Among them, four high affinity inhibitors were selected to confirm their anti-CHIKV activity in the in vitro assay. Quercetin derivatives, Taxifolin and Rutin, binds to the E1-E2 dimer at different sites and display inhibition of CHIKV infection with EC50 values 3.6 μM and 87.67 μM, respectively. Another potential inhibitor with ID ChemDiv 8015-3006 binds at both the target sites and shows anti-CHIKV activity at EC50 = 41 μM. The results show dose-dependent inhibitory effects of Taxifolin, Rutin and ChemDiv 8015-3006 against the CHIKV with minimal cytotoxicity. In addition, molecular dynamics studies revealed the structural stability of these inhibitors at their respective binding sites in the E1-E2 protein. In conclusion, our study reports Taxifolin, Rutin and ChemDiv 8015-3006 as potential inhibitors of the CHIKV entry. Also, this study suggests a few potential candidate inhibitors which could serve as a template to design envelope protein specific CHIKV entry inhibitors.
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Affiliation(s)
- Jyoti Verma
- School of Computational and Integrative Sciences, Jawaharlal Nehru University, New Delhi, India
| | - Abdul Hasan
- Vector Borne Diseases Group, International Centre for Genetic Engineering and Biotechnology, New Delhi, India
| | - Sujatha Sunil
- Vector Borne Diseases Group, International Centre for Genetic Engineering and Biotechnology, New Delhi, India.
| | - Naidu Subbarao
- School of Computational and Integrative Sciences, Jawaharlal Nehru University, New Delhi, India.
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Nabi-Afjadi M, Heydari M, Zalpoor H, Arman I, Sadoughi A, Sahami P, Aghazadeh S. Lectins and lectibodies: potential promising antiviral agents. Cell Mol Biol Lett 2022; 27:37. [PMID: 35562647 PMCID: PMC9100318 DOI: 10.1186/s11658-022-00338-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 04/21/2022] [Indexed: 12/30/2022] Open
Abstract
In nature, lectins are widely dispersed proteins that selectively recognize and bind to carbohydrates and glycoconjugates via reversible bonds at specific binding sites. Many viral diseases have been treated with lectins due to their wide range of structures, specificity for carbohydrates, and ability to bind carbohydrates. Through hemagglutination assays, these proteins can be detected interacting with various carbohydrates on the surface of cells and viral envelopes. This review discusses the most robust lectins and their rationally engineered versions, such as lectibodies, as antiviral proteins. Fusion of lectin and antibody’s crystallizable fragment (Fc) of immunoglobulin G (IgG) produces a molecule called a “lectibody” that can act as a carbohydrate-targeting antibody. Lectibodies can not only bind to the surface glycoproteins via their lectins and neutralize and clear viruses or infected cells by viruses but also perform Fc-mediated antibody effector functions. These functions include complement-dependent cytotoxicity (CDC), antibody-dependent cell-mediated cytotoxicity (ADCC), and antibody-dependent cell-mediated phagocytosis (ADCP). In addition to entering host cells, the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike protein S1 binds to angiotensin-converting enzyme 2 (ACE2) and downregulates it and type I interferons in a way that may lead to lung disease. The SARS-CoV-2 spike protein S1 and human immunodeficiency virus (HIV) envelope are heavily glycosylated, which could make them a major target for developing vaccines, diagnostic tests, and therapeutic drugs. Lectibodies can lead to neutralization and clearance of viruses and cells infected by viruses by binding to glycans located on the envelope surface (e.g., the heavily glycosylated SARS-CoV-2 spike protein).
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Affiliation(s)
- Mohsen Nabi-Afjadi
- Department of Biochemistry, Faculty of Biological Science, Tarbiat Modares University, Tehran, Iran
| | - Morteza Heydari
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, 13145-1384, Iran
| | - Hamidreza Zalpoor
- Shiraz Neuroscience Research Center, Shiraz University of Medical Sciences, Shiraz, Iran.,Network of Immunity in Infection, Malignancy and Autoimmunity (NIIMA), Universal Scientific Education and Research Network (USERN), Tehran, Iran.,American Association of Kidney Patients, Tampa, FL, USA
| | - Ibrahim Arman
- Department of Molecular Biology and Genetics, Faculty of Sciences and Arts, Zonguldak Bulent Ecevit University, Zonguldak, Turkey
| | - Arezoo Sadoughi
- Department of Immunology, International Campus, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Parisa Sahami
- Medical Biology Research Center, Health Technologies Institute, Kermanshah University of Medical Sciences (KUMS), Kermanshah, Iran
| | - Safiyeh Aghazadeh
- Division of Biochemistry, Department of Basic Sciences, Faculty of Veterinary Medicine, Urmia University, Urmia, 5756151818, Iran.
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Verma J, Subbarao N. In silico identification of small molecule protein-protein interaction inhibitors: targeting hotspot regions at the interface of MXRA8 and CHIKV envelope protein. J Biomol Struct Dyn 2022; 41:3349-3367. [PMID: 35272566 DOI: 10.1080/07391102.2022.2048080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Chikungunya virus (CHIKV) is an arthritogenic arbovirus responsible for re-emerging epidemics of Chikungunya fever around the world for centuries. Chikungunya has become endemic in Africa, Southeast Asia, the Indian subcontinent, and subtropical regions of the Americas. The unavailability of antiviral therapy or vaccine against the CHIKV and its continuous re-emergence demands an urgent need to develop potential candidate therapeutics. CHIKV entry into the host cell is mediated by its envelope proteins engaging the cellular receptor MXRA8 to invade the susceptible cells. We report here two essential target binding sites at the CHIKV E1-E2 proteins by identifying hotspot regions at the E1-E2-MXRA8 binding interface. Further, we employed high throughput computational screening to identify potential small molecule protein-protein interaction (PPI) modulators which could effectively bind at the identified target sites. Molecular dynamics simulations and binding free energy calculations confirmed the stability of three compounds, viz., ZINC299817498, ZINC584908978, and LAS52155651, at both the predicted interface binding sites. The polar and charged residues at the interface were responsible for energetically holding the ligands at the binding sites. Altogether, our findings suggest that the predicted target binding sites at the E1-E2 dimer could be essential to block the receptor interaction as well as the fusion process of the CHIKV particles. Thus, we identified a few small molecule PPI inhibitors with great potential to block the E1-E2-MXRA8 interaction and act as promising templates to design anti-CHIKV drugs.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Jyoti Verma
- School of Computational and Integrative Sciences, Jawaharlal Nehru University, New Delhi, India
| | - Naidu Subbarao
- School of Computational and Integrative Sciences, Jawaharlal Nehru University, New Delhi, India
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Yan R, Zhang X. Analysis of Cyclocarya paliurus flavonoids modulation on the physiology and gene expression in Enterococcus faecalis under bile salt stress. Lett Appl Microbiol 2021; 74:555-563. [PMID: 34951708 DOI: 10.1111/lam.13639] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 12/16/2021] [Accepted: 12/17/2021] [Indexed: 11/30/2022]
Abstract
Enterococcus faecalis (E. faecalis) is one of the probiotic groups in the intestinal tract which has varieties of functional effects in the host, such as a protective barrier, nutritional efficacy and antibacterial effects. Stress conditions such as low pH, bile salts, and hypertonicity are inevitable negative factors for the normal survival of E. faecalis in the gastrointestinal tract. Under the stress and inhibition of bile salt, E. faecalis needs specific adaptation and coping style if it wants to successfully colonize the intestine stably. The appropriate concentration of flavonoids can assist probiotics to serve a beneficial role and help them resist the stress of external irresistible environmental factors. In the present research, RNA-sequence (RNA-seq) technology was employed to investigate the influence of Cyclocarya paliurus flavonoids (CPF) on Enterococcus faecalis 131-2 (E. faecalis 131-2) exposed to bile salt stress. Analysis results revealed that under bile salt stress, many genes related to cellular process, catalytic activity, and transport activity were significantly differentially expressed (P < 0.05), and some not expected variations of which could be partly alleviated by supplementation of CPF, indicating its capacity to improve the bile salt tolerances of E. faecalis 131-2. Additionally, CPF alleviated the obvious inhibitory effects of bile salt stress on the exponential growth of E. faecalis 131-2. An overall view of the physiological and transcriptomic changes of E. faecalis 131-2 under bile salt stresses with or without CPF will further deepen our understanding of the mechanism by which CPF assists E. faecalis 131-2 to perform beneficial functions in the gastrointestinal environment.
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Affiliation(s)
- Ruonan Yan
- Department of Food Science and Engineering, Ningbo University, Ningbo, 315211, P.R. China
| | - Xin Zhang
- Department of Food Science and Engineering, Ningbo University, Ningbo, 315211, P.R. China
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Abstract
Lectins are widely distributed proteins having ability of binding selectively and reversibly with carbohydrates moieties and glycoconjugates. Although lectins have been reported from different biological sources, the legume lectins are the best-characterized family of plant lectins. Legume lectins are a large family of homologous proteins with considerable similarity in amino acid sequence and their tertiary structures. Despite having strong sequence conservation, these lectins show remarkable variability in carbohydrate specificity and quaternary structures. The ability of legume lectins in recognizing glycans and glycoconjugates on cells and other intracellular structures make them a valuable research tool in glycomic research. Due to variability in binding with glycans, glycoconjugates and multiple biological functions, legume lectins are the subject of intense research for their diverse application in different fields such as glycobiology, biomedical research and crop improvement. The present review specially focuses on structural and functional characteristics of legume lectins along with their potential areas of application.
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Affiliation(s)
- Rajan Katoch
- Biochemistry Laboratory, Department of Genetics and Plant Breeding, CSKHPKV, Palampur, 176 062 India
| | - Ankur Tripathi
- Biochemistry Laboratory, Department of Genetics and Plant Breeding, CSKHPKV, Palampur, 176 062 India
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Gómara MJ, Pons R, Herrera C, Ziprin P, Haro I. Peptide Amphiphilic-Based Supramolecular Structures with Anti-HIV-1 Activity. Bioconjug Chem 2021; 32:1999-2013. [PMID: 34254794 PMCID: PMC8447191 DOI: 10.1021/acs.bioconjchem.1c00292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
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In a previous work,
we defined a novel HIV-1 fusion inhibitor peptide
(E1P47) with a broad spectrum of activity against viruses from different
clades, subtypes, and tropisms. With the aim to enhance its efficacy,
in the present work we address the design and synthesis of several
peptide amphiphiles (PAs) based on the E1P47 peptide sequence to target
the lipid rafts of the cell membrane where the cell–cell fusion
process takes place. We report the synthesis of novel PAs having a
hydrophobic moiety covalently attached to the peptide sequence through
a hydrophilic spacer of polyethylene glycol. Characterization of self-assembly
in condensed phase and aqueous solution as well as their interaction
with model membranes was analyzed by several biophysical methods.
Our results demonstrated that the length of the spacer of polyethylene
glycol, the position of the peptide conjugation as well as the type
of the hydrophobic residue determine the antiviral activity of the
construct. Peptide amphiphiles with one alkyl tail either in C-terminus
(C-PAmonoalkyl) or in N-terminus (N-PAmonoalkyl) showed the highest anti-HIV-1
activities in the cellular model of TZM-bl cells or in a preclinical
model of the human mucosal tissue explants.
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Affiliation(s)
- Maria J Gómara
- Unit of Synthesis and Biomedical Applications of Peptides, Institute of Advanced Chemistry of Catalonia (IQAC-CSIC), Jordi Girona, 18-26 08034 Barcelona, Spain
| | - Ramon Pons
- Physical Chemistry of Surfactant Systems, Institute of Advanced Chemistry of Catalonia (IQAC-CSIC), Jordi Girona, 18-26 08034 Barcelona, Spain
| | - Carolina Herrera
- Department of Medicine, Imperial College London, London W2 1PG, United Kingdom
| | - Paul Ziprin
- Department of Surgery and Cancer, St. Mary's Hospital, Imperial College London, London W2 1PG, United Kingdom
| | - Isabel Haro
- Unit of Synthesis and Biomedical Applications of Peptides, Institute of Advanced Chemistry of Catalonia (IQAC-CSIC), Jordi Girona, 18-26 08034 Barcelona, Spain
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Tripp RA, Stambas J. Intervention Strategies for Seasonal and Emerging Respiratory Viruses with Drugs and Vaccines Targeting Viral Surface Glycoproteins. Viruses 2021; 13:v13040625. [PMID: 33917411 PMCID: PMC8067509 DOI: 10.3390/v13040625] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 03/31/2021] [Accepted: 04/03/2021] [Indexed: 12/12/2022] Open
Abstract
Vaccines and therapeutics targeting viral surface glycoproteins are a major component of disease prevention for respiratory viral diseases. Over the years, vaccines have proven to be the most successful intervention for preventing disease. Technological advances in vaccine platforms that focus on viral surface glycoproteins have provided solutions for current and emerging pathogens like SARS-CoV-2, and our understanding of the structural basis for antibody neutralization is guiding the selection of other vaccine targets for respiratory viruses like RSV. This review discusses the role of viral surface glycoproteins in disease intervention approaches.
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Affiliation(s)
- Ralph A. Tripp
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA 30605, USA
- Correspondence:
| | - John Stambas
- School of Medicine, Geelong Waurn Ponds, Deakin University, Melbourne, VIC 3125, Australia;
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