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Visalli MA, Nale Lovett DJ, Kornfeind EM, Herrington H, Xiao YT, Lee D, Plair P, Wilder SG, Garza BK, Young A, Visalli RJ. Mutagenesis and functional analysis of the varicella-zoster virus portal protein. J Virol 2024; 98:e0060323. [PMID: 38517165 PMCID: PMC11019927 DOI: 10.1128/jvi.00603-23] [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: 04/21/2023] [Accepted: 03/01/2024] [Indexed: 03/23/2024] Open
Abstract
Herpesviruses replicate by cleaving concatemeric dsDNA into single genomic units that are packaged through an oligomeric portal present in preformed procapsids. In contrast to what is known about phage portal proteins, details concerning herpesvirus portal structure and function are not as well understood. A panel of 65 Varicella-Zoster virus (VZV) recombinant portal proteins with five amino acid in-frame insertions were generated by random transposon mutagenesis of the VZV portal gene, ORF54. Subsequently, 65 VZVLUC recombinant viruses (TNs) were generated via recombineering. Insertions were mapped to predicted portal domains (clip, wing, stem, wall, crown, and β-hairpin tunnel-loop) and recombinant viruses were characterized for plaque morphology, replication kinetics, pORF54 expression, and classified based on replication in non-complementing (ARPE19) or complementing (ARPE54C50) cell lines. The N- and C-termini were tolerant to insertion mutagenesis, as were certain clip sub-domains. The majority of mutants mapping to the wing, wall, β-hairpin tunnel loop, and stem domains were lethal. Elimination of the predicted ORF54 start codon revealed that the first 40 amino acids of the N-terminus were not required for viral replication. Stop codon insertions in the C-terminus showed that the last 100 amino acids were not required for viral replication. Lastly, a putative protease cleavage site was identified in the C-terminus of pORF54. Cleavage was likely orchestrated by a viral protease; however, processing was not required for DNA encapsidation and viral replication. The panel of recombinants should prove valuable in future studies to dissect mammalian portal structure and function.IMPORTANCEThough nucleoside analogs and a live-attenuated vaccine are currently available to treat some human herpesvirus family members, alternate methods of combating herpesvirus infection could include blocking viral replication at the DNA encapsidation stage. The approval of Letermovir provided proof of concept regarding the use of encapsidation inhibitors to treat herpesvirus infections in the clinic. We propose that small-molecule compounds could be employed to interrupt portal oligomerization, assembly into the capsid vertex, or affect portal function/dynamics. Targeting portal at any of these steps would result in disruption of viral DNA packaging and a decrease or absence of mature infectious herpesvirus particles. The oligomeric portals of herpesviruses are structurally conserved, and therefore, it may be possible to find a single compound capable of targeting portals from one or more of the herpesvirus subfamilies. Drug candidates from such a series would be effective against viruses resistant to the currently available antivirals.
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Affiliation(s)
- Melissa A. Visalli
- Department of Biomedical Sciences, Mercer University School of Medicine, Savannah, Georgia, USA
| | - Dakota J. Nale Lovett
- Department of Biomedical Sciences, Mercer University School of Medicine, Savannah, Georgia, USA
| | - Ellyn M. Kornfeind
- Department of Biomedical Sciences, Mercer University School of Medicine, Savannah, Georgia, USA
| | - Haley Herrington
- Department of Biomedical Sciences, Mercer University School of Medicine, Savannah, Georgia, USA
| | - Yi Tian Xiao
- Department of Biomedical Sciences, Mercer University School of Medicine, Savannah, Georgia, USA
| | - Daniel Lee
- Department of Biomedical Sciences, Mercer University School of Medicine, Savannah, Georgia, USA
| | - Patience Plair
- Department of Biomedical Sciences, Mercer University School of Medicine, Savannah, Georgia, USA
| | - S. Garrett Wilder
- Department of Biomedical Sciences, Mercer University School of Medicine, Savannah, Georgia, USA
| | - Bret K. Garza
- Department of Biomedical Sciences, Mercer University School of Medicine, Savannah, Georgia, USA
| | - Ashton Young
- Department of Biomedical Sciences, Mercer University School of Medicine, Savannah, Georgia, USA
| | - Robert J. Visalli
- Department of Biomedical Sciences, Mercer University School of Medicine, Savannah, Georgia, USA
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Shahid M, Alaofi AL, Ahmad Ansari M, Fayaz Ahmad S, Alsuwayeh S, Taha E, Raish M. Utilizing sinapic acid as an inhibitory antiviral agent against MERS-CoV PLpro. Saudi Pharm J 2024; 32:101986. [PMID: 38487020 PMCID: PMC10937238 DOI: 10.1016/j.jsps.2024.101986] [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: 10/05/2023] [Accepted: 02/05/2024] [Indexed: 03/17/2024] Open
Abstract
Concerns about the social and economic collapse, high mortality rates, and stress on the healthcare system are developing due to the coronavirus onslaught in the form of various species and their variants. In the recent past, infections brought on by coronaviruses severe acute respiratory syndrome coronaviruses (SARS-CoV and SARS-CoV-2) as well as middle east respiratory syndrome coronavirus (MERS-CoV) have been reported. There is a severe lack of medications to treat various coronavirus types including MERS-CoV which is hazard to public health due to its ability for pandemic spread by human-to-human transmission. Here, we utilized sinapic acid (SA) against papain-like protease (PLpro), a crucial enzyme involved in MERS-CoV replication, because phytomedicine derived from nature has less well-known negative effects. The thermal shift assay (TSA) was used in the current study to determine whether the drug interact with the recombinant MERS-CoV PLpro. Also, inhibition assay was conducted as the hydrolysis of fluorogenic peptide from the Z-RLRGG-AMC-peptide bond in the presence of SA to determine the level of inhibition of the MERS-CoV PLpro. To study the structural binding efficiency Autodock Vina was used to dock SA to the MERS-CoV PLpro and results were analyzed using PyMOL and Maestro Schrödinger programs. Our results show a convincing interaction between SA and the MERS protease, as SA reduced MERS-CoV PLpro in a dose-dependent way IC50 values of 68.58 μM (of SA). The TSA showed SA raised temperature of melting to 54.61 °C near IC50 and at approximately 2X IC50 concentration (111.5 μM) the Tm for SA + MERS-CoV PLpro was 59.72 °C. SA was docked to MERS-CoV PLpro to identify the binding site. SA bound to the blocking loop (BL2) region of MERS-CoV PLpro interacts with F268, E272, V275, and P249 residues of MERS-CoV PLpro. The effectiveness of protease inhibitors against MERS-CoV has been established and SA is already known for broad range biological activity including antiviral properties; it can be a suitable candidate for anti-MERS-CoV treatment.
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Affiliation(s)
- Mudassar Shahid
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Ahmed L. Alaofi
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Mushtaq Ahmad Ansari
- Department of Phamacology and Toxicology, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia
| | - Sheikh Fayaz Ahmad
- Department of Phamacology and Toxicology, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia
| | - Saleh Alsuwayeh
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Ehab Taha
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Mohammad Raish
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
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Hulce KR, Jaishankar P, Lee GM, Bohn MF, Connelly EJ, Wucherer K, Ongpipattanakul C, Volk RF, Chuo SW, Arkin MR, Renslo AR, Craik CS. Inhibiting a dynamic viral protease by targeting a non-catalytic cysteine. Cell Chem Biol 2022; 29:785-798.e19. [PMID: 35364007 PMCID: PMC9133232 DOI: 10.1016/j.chembiol.2022.03.007] [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: 07/07/2021] [Revised: 01/07/2022] [Accepted: 03/10/2022] [Indexed: 11/03/2022]
Abstract
Viruses are responsible for some of the most deadly human diseases, yet available vaccines and antivirals address only a fraction of the potential viral human pathogens. Here, we provide a methodology for managing human herpesvirus (HHV) infection by covalently inactivating the HHV maturational protease via a conserved, non-catalytic cysteine (C161). Using human cytomegalovirus protease (HCMV Pr) as a model, we screened a library of disulfides to identify molecules that tether to C161 and inhibit proteolysis, then elaborated hits into irreversible HCMV Pr inhibitors that exhibit broad-spectrum inhibition of other HHV Pr homologs. We further developed an optimized tool compound targeted toward HCMV Pr and used an integrative structural biology and biochemical approach to demonstrate inhibitor stabilization of HCMV Pr homodimerization, exploiting a conformational equilibrium to block proteolysis. Irreversible HCMV Pr inhibition disrupts HCMV infectivity in cells, providing proof of principle for targeting proteolysis via a non-catalytic cysteine to manage viral infection.
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Affiliation(s)
- Kaitlin R Hulce
- Department of Pharmaceutical Chemistry, University of California, San Francisco, 600 16th Street, Genentech Hall, San Francisco, CA 94143-2280, USA
| | - Priyadarshini Jaishankar
- Department of Pharmaceutical Chemistry, University of California, San Francisco, 600 16th Street, Genentech Hall, San Francisco, CA 94143-2280, USA; Small Molecule Discovery Center, University of California, San Francisco, 600 16th Street, Genentech Hall, San Francisco, CA 94143-2280, USA
| | - Gregory M Lee
- Department of Pharmaceutical Chemistry, University of California, San Francisco, 600 16th Street, Genentech Hall, San Francisco, CA 94143-2280, USA; Small Molecule Discovery Center, University of California, San Francisco, 600 16th Street, Genentech Hall, San Francisco, CA 94143-2280, USA
| | - Markus-Frederik Bohn
- Department of Pharmaceutical Chemistry, University of California, San Francisco, 600 16th Street, Genentech Hall, San Francisco, CA 94143-2280, USA
| | - Emily J Connelly
- Department of Pharmaceutical Chemistry, University of California, San Francisco, 600 16th Street, Genentech Hall, San Francisco, CA 94143-2280, USA
| | - Kristin Wucherer
- Department of Pharmaceutical Chemistry, University of California, San Francisco, 600 16th Street, Genentech Hall, San Francisco, CA 94143-2280, USA
| | - Chayanid Ongpipattanakul
- Department of Pharmaceutical Chemistry, University of California, San Francisco, 600 16th Street, Genentech Hall, San Francisco, CA 94143-2280, USA
| | - Regan F Volk
- Department of Pharmaceutical Chemistry, University of California, San Francisco, 600 16th Street, Genentech Hall, San Francisco, CA 94143-2280, USA
| | - Shih-Wei Chuo
- Department of Pharmaceutical Chemistry, University of California, San Francisco, 600 16th Street, Genentech Hall, San Francisco, CA 94143-2280, USA
| | - Michelle R Arkin
- Department of Pharmaceutical Chemistry, University of California, San Francisco, 600 16th Street, Genentech Hall, San Francisco, CA 94143-2280, USA; Small Molecule Discovery Center, University of California, San Francisco, 600 16th Street, Genentech Hall, San Francisco, CA 94143-2280, USA
| | - Adam R Renslo
- Department of Pharmaceutical Chemistry, University of California, San Francisco, 600 16th Street, Genentech Hall, San Francisco, CA 94143-2280, USA; Small Molecule Discovery Center, University of California, San Francisco, 600 16th Street, Genentech Hall, San Francisco, CA 94143-2280, USA
| | - Charles S Craik
- Department of Pharmaceutical Chemistry, University of California, San Francisco, 600 16th Street, Genentech Hall, San Francisco, CA 94143-2280, USA.
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Botta L, Cesarini S, Zippilli C, Bizzarri BM, Fanelli A, Saladino R. Multicomponent reactions in the synthesis of antiviral compounds. Curr Med Chem 2021; 29:2013-2050. [PMID: 34620058 DOI: 10.2174/0929867328666211007121837] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 07/16/2021] [Accepted: 08/18/2021] [Indexed: 11/22/2022]
Abstract
BACKGROUND Multicomponent reactions are one-pot processes for the synthesis of highly functionalized hetero-cyclic and hetero-acyclic compounds, often endowed with biological activity. OBJECTIVE Multicomponent reactions are considered green processes with high atom economy. In addition, they present advantages compared to the classic synthetic methods such as high efficiency and low wastes production. METHOD In these reactions two or more reagents are combined together in the same flask to yield a product containing almost all the atoms of the starting materials. RESULTS The scope of this review is to present an overview of the application of multicomponent reactions in the synthesis of compounds endowed with antiviral activity. The syntheses are classified depending on the viral target. CONCLUSION Multicomponent reactions can be applied to all the stages of the drug discovery and development process making them very useful in the search for new agents active against emerging (viral) pathogens.
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Affiliation(s)
- Lorenzo Botta
- Department Biological and Ecological Sciences, University of Tuscia, Viterbo. Italy
| | - Silvia Cesarini
- Department Biological and Ecological Sciences, University of Tuscia, Viterbo. Italy
| | - Claudio Zippilli
- Department Biological and Ecological Sciences, University of Tuscia, Viterbo. Italy
| | | | - Angelica Fanelli
- Department Biological and Ecological Sciences, University of Tuscia, Viterbo. Italy
| | - Raffaele Saladino
- Department Biological and Ecological Sciences, University of Tuscia, Viterbo. Italy
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Could Probiotics and Postbiotics Function as "Silver Bullet" in the Post-COVID-19 Era? Probiotics Antimicrob Proteins 2021; 13:1499-1507. [PMID: 34386940 PMCID: PMC8360758 DOI: 10.1007/s12602-021-09833-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/04/2021] [Indexed: 12/14/2022]
Abstract
We are currently experiencing the realities of the most severe pandemic within living memory, with major impacts on the health and economic well-being of our planet. The scientific community has demonstrated an unprecedented mobilization capability, with the rapid development of vaccines and drugs targeting the protection of human life and palliative measures for infected individuals. However, are we adequately prepared for ongoing defense against COVID-19 and its variants in the post-pandemic world? Moreover, are we equipped to provide a satisfactory quality of life for individuals who are recovering from COVID-19 disease? What are the possibilities for the acceleration of the recovery process? Here, we give special consideration to the potential and already-demonstrated role of probiotics and traditional medical approaches to the management of current and potential future encounters with our major virus adversaries.
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Kazakova O, Tret’yakova E, Baev D. Evaluation of A-azepano-triterpenoids and related derivatives as antimicrobial and antiviral agents. J Antibiot (Tokyo) 2021; 74:559-573. [PMID: 34253887 PMCID: PMC8273037 DOI: 10.1038/s41429-021-00448-9] [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: 04/08/2021] [Revised: 06/17/2021] [Accepted: 06/24/2021] [Indexed: 02/06/2023]
Abstract
A series of semisynthetic triterpenoids with A-ring azepano- and A-seco-fragments as well as hydrazido/hydrazono-substituents at C3 and C28 has been synthesized and evaluated for antimicrobial activity against key ESKAPE pathogens and DNA viruses (HSV-1, HCMV, HPV-11). It was found that azepanouvaol 8, 3-amino-3,4-seco-4(23)-en derivatives of uvaol 21 and glycyrrhetol-dien 22 as well as azepano-glycyrrhetol-tosylate 32 showed strong antimicrobial activities against MRSA with MIC ≤ 0.15 μM that exceeds the effect of antibiotic vancomycin. Azepanobetulinic acid cyclohexyl amide 4 exhibited significant bacteriostatic effect against MRSA (MIC ≤ 0.15 μM) with low cytotoxicity to HEK-293 even at a maximum tested concentration of >20 μM (selectivity index SI 133) and may be considered a noncytotoxic anti-MRSA agent. Azepanobetulin 1, azepanouvaol 8, and azepano-glycyrrhetol 15 showed high potency towards HCMV (EC50 0.15; 0.11; 0.11 µM) with selectivity indexes SI50 115; 136; 172, respectively. The docking studies suggest the possible interactions of the leading compounds with the molecular targets.
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Affiliation(s)
- Oxana Kazakova
- Ufa Institute of Chemistry of the Ufa Federal Research Centre of the Russian Academy of Sciences, 71 Prospect Oktyabrya, 450054, Ufa, Russian Federation.
| | - Elena Tret’yakova
- grid.465349.9Ufa Institute of Chemistry of the Ufa Federal Research Centre of the Russian Academy of Sciences, 71 Prospect Oktyabrya, 450054 Ufa, Russian Federation
| | - Dmitry Baev
- grid.419817.2N.N. Vorozhtzov Novosibirsk Institute of Organic Chemistry SB RAS, 9, Lavrent’ev Ave., Novosibirsk, 630090 Russian Federation
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7
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Čulenová M, Sychrová A, Hassan STS, Berchová-Bímová K, Svobodová P, Helclová A, Michnová H, Hošek J, Vasilev H, Suchý P, Kuzminová G, Švajdlenka E, Gajdziok J, Čížek A, Suchý V, Šmejkal K. Multiple In vitro biological effects of phenolic compounds from Morus alba root bark. JOURNAL OF ETHNOPHARMACOLOGY 2020; 248:112296. [PMID: 31610262 DOI: 10.1016/j.jep.2019.112296] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Accepted: 10/09/2019] [Indexed: 05/18/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Morus alba L. is used in traditional Chinese medicine for the treatment of various diseases, including bacterial infections and inflammation. As a rich source of phenolic compounds, the plant is an object of many phytochemical and pharmacological studies. AIM OF THE STUDY The aim of the study was to isolate and evaluate possible parallel antiviral, antibacterial, and anti-inflammatory activities of phenolic mulberry compounds. MATERIALS AND METHODS Extensive chromatographic separation of mulberry root bark extract and in vitro biological screening of 26 constituents identified promising candidates for further pharmacological research. Selected compounds were screened for anti-infective and anti-inflammatory activities. Antiviral activity was determined by the plaque number reduction assay and by the titer reduction assay, antibacterial using broth microdilution method, and anti-inflammatory activity using COX Colorimetric inhibitor screening assay kit. One compound was evaluated in vivo in carrageenan-induced paw-edema in mice. RESULTS Five prenylated compounds 1, 2, 8, 9, and 11, together with a simple phenolic ester 13, exhibited inhibitory activity against the replication of herpes simplex virus 1 (HSV-1) or herpes simplex virus 2 (HSV-2), with IC50 values ranging from 0.64 to 1.93 μg/mL, and EC50 values 0.93 and 1.61 μg/mL. Molecular docking studies demonstrated the effects of the active compounds by targeting HSV-1 DNA polymerase and HSV-2 protease. In antibacterial assay, compounds 1, 4, 11, and 17 diminished the growth of all of the Gram-positive strains tested, with MIC values of 1-16 μg/mL. The anti-inflammatory ability of several compounds to inhibit cyclooxygenase 2 (COX-2) was tested in vitro, and compound 16 displayed greater activity than the indomethacin, positive control. Mulberrofuran B (11) showed anti-inflammatory activity in vivo against carrageenan-induced paw-edema in mice. CONCLUSIONS Experimental investigation showed promising antiviral, antibacterial, and/or anti-inflammatory activities of the phenolic mulberry constituents, often with multiple inhibitory effects that might be used as a potential source of new medicine.
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Affiliation(s)
- Marie Čulenová
- Department of Natural Drugs, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, CZ-612 42, Brno, Czech Republic.
| | - Alice Sychrová
- Department of Natural Drugs, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, CZ-612 42, Brno, Czech Republic
| | - Sherif T S Hassan
- Department of Natural Drugs, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, CZ-612 42, Brno, Czech Republic
| | - Kateřina Berchová-Bímová
- Department of Applied Ecology, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, CZ-165 21, Praha 6-Suchdol, Czech Republic
| | - Petra Svobodová
- Department of Natural Drugs, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, CZ-612 42, Brno, Czech Republic
| | - Alexandra Helclová
- Department of Natural Drugs, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, CZ-612 42, Brno, Czech Republic
| | - Hana Michnová
- Department of Infectious Diseases and Microbiology, Faculty of Veterinary Medicine, University of Veterinary and Pharmaceutical Sciences Brno, CZ-612 42, Brno, Czech Republic
| | - Jan Hošek
- Department of Molecular Biology and Pharmaceutical Biotechnology, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, CZ-612 42, Brno, Czech Republic
| | - Hristo Vasilev
- Department of Pharmacognosy, Faculty of Pharmacy, Medical University-Sofia, 2 Dunav str., BG-1000, Sofia, Bulgaria
| | - Pavel Suchý
- Department of Human Pharmacology and Toxicology, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, CZ-612 42, Brno, Czech Republic
| | - Gabriela Kuzminová
- Department of Human Pharmacology and Toxicology, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, CZ-612 42, Brno, Czech Republic
| | - Emil Švajdlenka
- Department of Natural Drugs, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, CZ-612 42, Brno, Czech Republic
| | - Jan Gajdziok
- Department of Pharmaceutics, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, CZ-612 42, Brno, Czech Republic
| | - Alois Čížek
- Department of Infectious Diseases and Microbiology, Faculty of Veterinary Medicine, University of Veterinary and Pharmaceutical Sciences Brno, CZ-612 42, Brno, Czech Republic
| | - Václav Suchý
- Department of Natural Drugs, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, CZ-612 42, Brno, Czech Republic
| | - Karel Šmejkal
- Department of Natural Drugs, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, CZ-612 42, Brno, Czech Republic.
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Treml J, Gazdová M, Šmejkal K, Šudomová M, Kubatka P, Hassan STS. Natural Products-Derived Chemicals: Breaking Barriers to Novel Anti-HSV Drug Development. Viruses 2020; 12:E154. [PMID: 32013134 PMCID: PMC7077281 DOI: 10.3390/v12020154] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 01/20/2020] [Accepted: 01/23/2020] [Indexed: 01/06/2023] Open
Abstract
Recently, the problem of viral infection, particularly the infection with herpes simplex virus type 1 (HSV-1) and type 2 (HSV-2), has dramatically increased and caused a significant challenge to public health due to the rising problem of drug resistance. The antiherpetic drug resistance crisis has been attributed to the overuse of these medications, as well as the lack of new drug development by the pharmaceutical industry due to reduced economic inducements and challenging regulatory requirements. Therefore, the development of novel antiviral drugs against HSV infections would be a step forward in improving global combat against these infections. The incorporation of biologically active natural products into anti-HSV drug development at the clinical level has gained limited attention to date. Thus, the search for new drugs from natural products that could enter clinical practice with lessened resistance, less undesirable effects, and various mechanisms of action is greatly needed to break the barriers to novel antiherpetic drug development, which, in turn, will pave the road towards the efficient and safe treatment of HSV infections. In this review, we aim to provide an up-to-date overview of the recent advances in natural antiherpetic agents. Additionally, this paper covers a large scale of phenolic compounds, alkaloids, terpenoids, polysaccharides, peptides, and other miscellaneous compounds derived from various sources of natural origin (plants, marine organisms, microbial sources, lichen species, insects, and mushrooms) with promising activities against HSV infections; these are in vitro and in vivo studies. This work also highlights bioactive natural products that could be used as templates for the further development of anti-HSV drugs at both animal and clinical levels, along with the potential mechanisms by which these compounds induce anti-HSV properties. Future insights into the development of these molecules as safe and effective natural anti-HSV drugs are also debated.
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Affiliation(s)
- Jakub Treml
- Department of Molecular Biology and Pharmaceutical Biotechnology, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, Palackého tř. 1946/1, 612 42 Brno, Czech Republic;
| | - Markéta Gazdová
- Department of Natural Drugs, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, Palackého tř. 1946/1, 612 42 Brno, Czech Republic; (M.G.); (K.Š.)
| | - Karel Šmejkal
- Department of Natural Drugs, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, Palackého tř. 1946/1, 612 42 Brno, Czech Republic; (M.G.); (K.Š.)
| | - Miroslava Šudomová
- Museum of Literature in Moravia, Klášter 1, 664 61 Rajhrad, Czech Republic;
| | - Peter Kubatka
- Department of Medical Biology, Jessenius Faculty of Medicine, Comenius University in Bratislava, 036 01 Martin, Slovakia;
- Division of Oncology, Biomedical Center Martin, Jessenius Faculty of Medicine, Comenius University in Bratislava, 036 01 Martin, Slovakia
| | - Sherif T. S. Hassan
- Department of Applied Ecology, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, 6-Suchdol, 165 21 Prague, Czech Republic
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Tomar S, Mahajan S, Kumar R. Advances in structure-assisted antiviral discovery for animal viral diseases. GENOMICS AND BIOTECHNOLOGICAL ADVANCES IN VETERINARY, POULTRY, AND FISHERIES 2020. [PMCID: PMC7149589 DOI: 10.1016/b978-0-12-816352-8.00019-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Psoromic Acid, a Lichen-Derived Molecule, Inhibits the Replication of HSV-1 and HSV-2, and Inactivates HSV-1 DNA Polymerase: Shedding Light on Antiherpetic Properties. Molecules 2019; 24:molecules24162912. [PMID: 31405197 PMCID: PMC6720901 DOI: 10.3390/molecules24162912] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 08/07/2019] [Accepted: 08/08/2019] [Indexed: 01/26/2023] Open
Abstract
Psoromic acid (PA), a bioactive lichen-derived compound, was investigated for its inhibitory properties against herpes simplex virus type 1 (HSV-1) and type 2 (HSV-2), along with the inhibitory effect on HSV-1 DNA polymerase, which is a key enzyme that plays an essential role in HSV-1 replication cycle. PA was found to notably inhibit HSV-1 replication (50% inhibitory concentration (IC50): 1.9 μM; selectivity index (SI): 163.2) compared with the standard drug acyclovir (ACV) (IC50: 2.6 μM; SI: 119.2). The combination of PA with ACV has led to potent inhibitory activity against HSV-1 replication (IC50: 1.1 µM; SI: 281.8) compared with that of ACV. Moreover, PA displayed equivalent inhibitory action against HSV-2 replication (50% effective concentration (EC50): 2.7 μM; SI: 114.8) compared with that of ACV (EC50: 2.8 μM; SI: 110.7). The inhibition potency of PA in combination with ACV against HSV-2 replication was also detected (EC50: 1.8 µM; SI: 172.2). Further, PA was observed to effectively inhibit HSV-1 DNA polymerase (as a non-nucleoside inhibitor) with respect to dTTP incorporation in a competitive inhibition mode (half maximal inhibitory concentration (IC50): 0.7 μM; inhibition constant (Ki): 0.3 μM) compared with reference drugs aphidicolin (IC50: 0.8 μM; Ki: 0.4 μM) and ACV triphosphate (ACV-TP) (IC50: 0.9 μM; Ki: 0.5 μM). It is noteworthy that the mechanism by which PA-induced anti-HSV-1 activity was related to its inhibitory action against HSV-1 DNA polymerase. Furthermore, the outcomes of in vitro experiments were authenticated using molecular docking analyses, as the molecular interactions of PA with the active sites of HSV-1 DNA polymerase and HSV-2 protease (an essential enzyme required for HSV-2 replication) were revealed. Since this is a first report on the above-mentioned properties, we can conclude that PA might be a future drug for the treatment of HSV infections as well as a promising lead molecule for further anti-HSV drug design.
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Tang A, Caballero AR, Marquart ME, Bierdeman MA, O'Callaghan RJ. Mechanism of Pseudomonas aeruginosa Small Protease (PASP), a Corneal Virulence Factor. Invest Ophthalmol Vis Sci 2019; 59:5993-6002. [PMID: 30572344 PMCID: PMC6306078 DOI: 10.1167/iovs.18-25834] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Purpose Pseudomonas aeruginosa is the leading cause of contact lens-associated bacterial keratitis. Secreted bacterial proteases have a key role in keratitis, including the P. aeruginosa small protease (PASP), a proven corneal virulence factor. We investigated the mechanism of PASP and its importance to corneal toxicity. Methods PASP, a serine protease, was tested for activity on various substrates. The catalytic triad of PASP was sought by bioinformatic analysis and site-directed mutagenesis. All mutant constructs were expressed in a P. aeruginosa PASP-deficient strain; the resulting proteins were purified using ion-exchange, gel filtration, or affinity chromatography; and the proteolytic activity was assessed by gelatin zymography and a fluorometric assay. The purified PASP proteins with single amino acid changes were injected into rabbit corneas to determine their pathological effects. Results PASP substrates were cleaved at arginine or lysine residues. Alanine substitution of PASP residues Asp-29, His-34, or Ser-47 eliminated protease activity, whereas PASP with substitution for Ser-59 (control) retained activity. Computer modeling and Western blot analysis indicated that formation of a catalytic triad required dimer formation, and zymography demonstrated the protease activity of the homodimer, but not the monomer. PASP with the Ser-47 mutation, but not with the control mutation, lacked corneal toxicity, indicating the importance of protease activity. Conclusions PASP is a secreted serine protease that can cleave proteins at arginine or lysine residues and PASP activity requires dimer or larger aggregates to create a functional active site. Most importantly, proteolytic PASP molecules demonstrated highly significant toxicity for the rabbit cornea.
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Affiliation(s)
- Aihua Tang
- Department of Microbiology and Immunology, University of Mississippi Medical Center, Jackson, Mississippi, United States
| | - Armando R Caballero
- Department of Microbiology and Immunology, University of Mississippi Medical Center, Jackson, Mississippi, United States
| | - Mary E Marquart
- Department of Microbiology and Immunology, University of Mississippi Medical Center, Jackson, Mississippi, United States
| | - Michael A Bierdeman
- Department of Microbiology and Immunology, University of Mississippi Medical Center, Jackson, Mississippi, United States
| | - Richard J O'Callaghan
- Department of Microbiology and Immunology, University of Mississippi Medical Center, Jackson, Mississippi, United States
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12
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Ojha NK, Zyryanov GV, Majee A, Charushin VN, Chupakhin ON, Santra S. Copper nanoparticles as inexpensive and efficient catalyst: A valuable contribution in organic synthesis. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.10.004] [Citation(s) in RCA: 113] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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13
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Zühlsdorf M, Hinrichs W. Assemblins as maturational proteases in herpesviruses. J Gen Virol 2017; 98:1969-1984. [PMID: 28758622 DOI: 10.1099/jgv.0.000872] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
During assembly of herpesvirus capsids, a protein scaffold self-assembles to ring-like structures forming the scaffold of the spherical procapsids. Proteolytic activity of the herpesvirus maturational protease causes structural changes that result in angularization of the capsids. In those mature icosahedral capsids, the packaging of viral DNA into the capsids can take place. The strictly regulated protease is called assemblin. It is inactive in its monomeric state and activated by dimerization. The structures of the dimeric forms of several assemblins from all herpesvirus subfamilies have been elucidated in the last two decades. They revealed a unique serine-protease fold with a catalytic triad consisting of a serine and two histidines. Inhibitors that disturb dimerization by binding to the dimerization area were found recently. Additionally, the structure of the monomeric form of assemblin from pseudorabies virus and some monomer-like structures of Kaposi's sarcoma-associated herpesvirus assemblin were solved. These findings are the proof-of-principle for the development of new anti-herpesvirus drugs. Therefore, the most important information on this fascinating and unique class of proteases is summarized here.
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Affiliation(s)
- Martin Zühlsdorf
- Institute of Biochemistry, University of Greifswald, Felix-Hausdorff-Straße 4, 17489 Greifswald, Germany
| | - Winfried Hinrichs
- Institute of Biochemistry, University of Greifswald, Felix-Hausdorff-Straße 4, 17489 Greifswald, Germany
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14
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Hunnur R, Kamble R, Dorababu A, Sunil Kumar B, Bathula C. TiCl4: An efficient catalyst for one-pot synthesis of 1,2-dihydro-1-aryl-naphtho-[1,2-e][1,3]oxazin-3-one derivatives and their drug score analysis. ARAB J CHEM 2017. [DOI: 10.1016/j.arabjc.2013.06.028] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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15
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Chikungunya virus infectivity, RNA replication and non-structural polyprotein processing depend on the nsP2 protease's active site cysteine residue. Sci Rep 2016; 6:37124. [PMID: 27845418 PMCID: PMC5109220 DOI: 10.1038/srep37124] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Accepted: 10/24/2016] [Indexed: 11/23/2022] Open
Abstract
Chikungunya virus (CHIKV), genus Alphavirus, family Togaviridae, has a positive-stand RNA genome approximately 12 kb in length. In infected cells, the genome is translated into non-structural polyprotein P1234, an inactive precursor of the viral replicase, which is activated by cleavages carried out by the non-structural protease, nsP2. We have characterized CHIKV nsP2 using both cell-free and cell-based assays. First, we show that Cys478 residue in the active site of CHIKV nsP2 is indispensable for P1234 processing. Second, the substrate requirements of CHIKV nsP2 are quite similar to those of nsP2 of related Semliki Forest virus (SFV). Third, substitution of Ser482 residue, recently reported to contribute to the protease activity of nsP2, with Ala has almost no negative effect on the protease activity of CHIKV nsP2. Fourth, Cys478 to Ala as well as Trp479 to Ala mutations in nsP2 completely abolished RNA replication in CHIKV and SFV trans-replication systems. In contrast, trans-replicases with Ser482 to Ala mutation were similar to wild type counterparts. Fifth, Cys478 to Ala as well as Trp479 to Ala mutations in nsP2 abolished the rescue of infectious virus from CHIKV RNA transcripts while Ser482 to Ala mutation had no effect. Thus, CHIKV nsP2 is a cysteine protease.
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16
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Szilvay AM, Sarria SV, Mannelqvist M, Aasland R, Furnes C. Proteolytic activity assayed by subcellular localization switching of a substrate. Biochem Biophys Rep 2016; 8:23-28. [PMID: 28955937 PMCID: PMC5613695 DOI: 10.1016/j.bbrep.2016.07.011] [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: 02/08/2016] [Revised: 06/27/2016] [Accepted: 07/13/2016] [Indexed: 10/24/2022] Open
Abstract
An approach to assay proteolytic activity in vivo by altering the subcellular localization of a labelled substrate was demonstrated. The assay included a protein shuttling between different cellular compartments and a site-specific recombinant protease. The shuttle protein used was the human immunodeficiency virus type 1 (HIV-1) Rev protein tandemly fused to the enhanced green fluorescent protein (EGFP) and the red fluorescent protein (RFP), while the protease was the site-specific protease VP24 from the herpes simplex virus type 1 (HSV-1). The fluorescent proteins in the Rev fusion protein were separated by a cleavage site specific for the VP24 protease. When co-expressed in COS-7 cells proteolysis was observed by fluorescence microscopy as a shift from a predominantly cytoplasmic localization of the fusion protein RevEGFP to a nuclear localization while the RFP part of the fusion protein remained in the cytoplasm. The cleavage of the fusion protein by VP24 was confirmed by Western blot analysis. The activity of VP24, when tagged N-terminally by the Myc-epitope, was found to be comparable to VP24. These results demonstrates that the activity and localization of a recombinantly expressed protease can be assessed by protease-mediated cleavage of fusion proteins containing a specific protease cleavage site.
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Affiliation(s)
- Anne-Marie Szilvay
- Department of Molecular Biology, University of Bergen, HIB, Post-box 7800, N-5020 Bergen, Norway
| | | | - Monica Mannelqvist
- Department of Molecular Biology, University of Bergen, HIB, Post-box 7800, N-5020 Bergen, Norway.,Centre for Cancer Biomarkers CCBIO, Department of Clinical Medicine, University of Bergen, HIB, Post-box 7800, N-5020 Bergen, Norway
| | - Rein Aasland
- Department of Molecular Biology, University of Bergen, HIB, Post-box 7800, N-5020 Bergen, Norway
| | - Clemens Furnes
- Department of Molecular Biology, University of Bergen, HIB, Post-box 7800, N-5020 Bergen, Norway.,Centre for Organelle Research (CORE), University of Stavanger, Norway
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17
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Gable JE, Lee GM, Acker TM, Hulce KR, Gonzalez ER, Schweigler P, Melkko S, Farady CJ, Craik CS. Fragment-Based Protein-Protein Interaction Antagonists of a Viral Dimeric Protease. ChemMedChem 2016; 11:862-9. [PMID: 26822284 DOI: 10.1002/cmdc.201500526] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Indexed: 11/11/2022]
Abstract
Fragment-based drug discovery has shown promise as an approach for challenging targets such as protein-protein interfaces. We developed and applied an activity-based fragment screen against dimeric Kaposi's sarcoma-associated herpesvirus protease (KSHV Pr) using an optimized fluorogenic substrate. Dose-response determination was performed as a confirmation screen, and NMR spectroscopy was used to map fragment inhibitor binding to KSHV Pr. Kinetic assays demonstrated that several initial hits also inhibit human cytomegalovirus protease (HCMV Pr). Binding of these hits to HCMV Pr was also confirmed by NMR spectroscopy. Despite the use of a target-agnostic fragment library, more than 80 % of confirmed hits disrupted dimerization and bound to a previously reported pocket at the dimer interface of KSHV Pr, not to the active site. One class of fragments, an aminothiazole scaffold, was further explored using commercially available analogues. These compounds demonstrated greater than 100-fold improvement of inhibition. This study illustrates the power of fragment-based screening for these challenging enzymatic targets and provides an example of the potential druggability of pockets at protein-protein interfaces.
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Affiliation(s)
- Jonathan E Gable
- Department of Pharmaceutical Chemistry, University of California, San Francisco, CA, 94158-2280, USA.,Biophysics Graduate Group, University of California, San Francisco, CA, 94158-2280, USA
| | - Gregory M Lee
- Department of Pharmaceutical Chemistry, University of California, San Francisco, CA, 94158-2280, USA
| | - Timothy M Acker
- Department of Pharmaceutical Chemistry, University of California, San Francisco, CA, 94158-2280, USA
| | - Kaitlin R Hulce
- Department of Pharmaceutical Chemistry, University of California, San Francisco, CA, 94158-2280, USA.,Chemistry and Chemical Biology Graduate Group, University of California, San Francisco, CA, 94158-2280, USA
| | - Eric R Gonzalez
- Department of Pharmaceutical Chemistry, University of California, San Francisco, CA, 94158-2280, USA
| | - Patrick Schweigler
- Novartis Institutes for BioMedical Research, Forum 1, Novartis Campus, 4002, Basel, Switzerland
| | - Samu Melkko
- Novartis Institutes for BioMedical Research, Forum 1, Novartis Campus, 4002, Basel, Switzerland
| | - Christopher J Farady
- Novartis Institutes for BioMedical Research, Forum 1, Novartis Campus, 4002, Basel, Switzerland
| | - Charles S Craik
- Department of Pharmaceutical Chemistry, University of California, San Francisco, CA, 94158-2280, USA.
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18
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Ponra S, Majumdar KC. Brønsted acid-promoted synthesis of common heterocycles and related bio-active and functional molecules. RSC Adv 2016. [DOI: 10.1039/c5ra27069c] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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19
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NIKNAm KHODABAKHSH, ABOLPOUR PARISA. Synthesis of naphthoxazinone derivatives using silica-bonded S-sulfonic acid as catalyst under solvent-free conditions. J CHEM SCI 2015. [DOI: 10.1007/s12039-015-0895-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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20
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Zühlsdorf M, Werten S, Klupp BG, Palm GJ, Mettenleiter TC, Hinrichs W. Dimerization-Induced Allosteric Changes of the Oxyanion-Hole Loop Activate the Pseudorabies Virus Assemblin pUL26N, a Herpesvirus Serine Protease. PLoS Pathog 2015; 11:e1005045. [PMID: 26161660 PMCID: PMC4498786 DOI: 10.1371/journal.ppat.1005045] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Accepted: 06/24/2015] [Indexed: 01/01/2023] Open
Abstract
Herpesviruses encode a characteristic serine protease with a unique fold and an active site that comprises the unusual triad Ser-His-His. The protease is essential for viral replication and as such constitutes a promising drug target. In solution, a dynamic equilibrium exists between an inactive monomeric and an active dimeric form of the enzyme, which is believed to play a key regulatory role in the orchestration of proteolysis and capsid assembly. Currently available crystal structures of herpesvirus proteases correspond either to the dimeric state or to complexes with peptide mimetics that alter the dimerization interface. In contrast, the structure of the native monomeric state has remained elusive. Here, we present the three-dimensional structures of native monomeric, active dimeric, and diisopropyl fluorophosphate-inhibited dimeric protease derived from pseudorabies virus, an alphaherpesvirus of swine. These structures, solved by X-ray crystallography to respective resolutions of 2.05, 2.10 and 2.03 Å, allow a direct comparison of the main conformational states of the protease. In the dimeric form, a functional oxyanion hole is formed by a loop of 10 amino-acid residues encompassing two consecutive arginine residues (Arg136 and Arg137); both are strictly conserved throughout the herpesviruses. In the monomeric form, the top of the loop is shifted by approximately 11 Å, resulting in a complete disruption of the oxyanion hole and loss of activity. The dimerization-induced allosteric changes described here form the physical basis for the concentration-dependent activation of the protease, which is essential for proper virus replication. Small-angle X-ray scattering experiments confirmed a concentration-dependent equilibrium of monomeric and dimeric protease in solution. Herpesviruses encode a unique serine protease, which is essential for herpesvirus capsid maturation and is therefore an interesting target for drug development. In solution, this protease exists in an equilibrium of an inactive monomeric and an active dimeric form. All currently available crystal structures of herpesvirus proteases represent complexes, particularly dimers. Here we show the first three-dimensional structure of the native monomeric form in addition to the native and the chemically inactivated dimeric form of the protease derived from the porcine herpesvirus pseudorabies virus. Comparison of the monomeric and dimeric form allows predictions on the structural changes that occur during dimerization and shed light onto the process of protease activation. These new crystal structures provide a rational base to develop drugs preventing dimerization and therefore impeding herpesvirus capsid maturation. Furthermore, it is likely that this mechanism is conserved throughout the herpesviruses.
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Affiliation(s)
- Martin Zühlsdorf
- Institute of Biochemistry, University of Greifswald, Greifswald, Germany
| | - Sebastiaan Werten
- Institute of Biochemistry, University of Greifswald, Greifswald, Germany
| | - Barbara G. Klupp
- Institute of Molecular Virology and Cell Biology, Friedrich-Loeffler-Institut, Greifswald—Insel Riems, Germany
| | - Gottfried J. Palm
- Institute of Biochemistry, University of Greifswald, Greifswald, Germany
| | - Thomas C. Mettenleiter
- Institute of Molecular Virology and Cell Biology, Friedrich-Loeffler-Institut, Greifswald—Insel Riems, Germany
| | - Winfried Hinrichs
- Institute of Biochemistry, University of Greifswald, Greifswald, Germany
- * E-mail:
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21
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Computational Studies of Benzoxazinone Derivatives as Antiviral Agents against Herpes Virus Type 1 Protease. Molecules 2015; 20:10689-704. [PMID: 26065834 PMCID: PMC6272224 DOI: 10.3390/molecules200610689] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2015] [Revised: 05/27/2015] [Accepted: 06/01/2015] [Indexed: 11/24/2022] Open
Abstract
Herpes simplex virus infections have been described in the medical literature for centuries, yet the the drugs available nowadays for therapy are largely ineffective and low oral bioavailability plays an important role on the inefficacy of the treatments. Additionally, the details of the inhibition of Herpes Virus type 1 are still not fully understood. Studies have shown that several viruses encode one or more proteases required for the production new infectious virions. This study presents an analysis of the interactions between HSV-1 protease and benzoxazinone derivatives through a combination of structure-activity relationships, comparative modeling and molecular docking studies. The structure activity relationship results showed an important contribution of hydrophobic and polarizable groups and limitations for bulky groups in specific positions. Two Herpes Virus type 1 protease models were constructed and compared to achieve the best model which was obtained by MODELLER. Molecular docking results pointed to an important interaction between the most potent benzoxazinone derivative and Ser129, consistent with previous mechanistic data. Moreover, we also observed hydrophobic interactions that may play an important role in the stabilization of inhibitors in the active site. Finally, we performed druglikeness and drugscore studies of the most potent derivatives and the drugs currently used against Herpes virus.
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22
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Rai VK, Singh N. CeCl₃.7H2O/NaI-promoted direct synthesis of 1,3-benzoxazine-2-thione n-nucleosides under microwave irradiation. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2015; 32:247-55. [PMID: 23581717 DOI: 10.1080/15257770.2013.783702] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
A microwave-assisted efficient and direct synthetic route to 1,3-benzoxazine-2-thione N-nucleos ides via CeCl₃.7H2O/NaI catalyzed cycloisomerization of salicylaldehyde 4-(β-D-ribofuranosyl) thiosemicarbazones followed by reductive dehydrazination is reported.
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Affiliation(s)
- Vijai K Rai
- Applied Chemistry Division, Department of Basic Sciences & Humanities, Institute of Technology, Guru Ghasidas Vishwavidyalaya, Bilaspur, Chhattisgarh, India.
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23
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Long X, Gou Y, Luo M, Zhang S, Zhang H, Bai L, Wu S, He Q, Chen K, Huang A, Zhou J, Wang D. Soluble expression, purification, and characterization of active recombinant human tissue plasminogen activator by auto-induction in E. coli. BMC Biotechnol 2015; 15:13. [PMID: 25886739 PMCID: PMC4379951 DOI: 10.1186/s12896-015-0127-y] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Accepted: 02/09/2015] [Indexed: 01/03/2023] Open
Abstract
Background Human tissue plasminogen activator (tPA) belongs to the serine protease family. It converts plasminogen into plasmin and is used clinically to treat thrombosis. Human tPA is composed of 527 amino acids residues and contains 17 disulfide bonds. Escherichia coli has been used only rarely for the efficient production of recombinant tPA. However, the functional expression of full-length tPA that contains multiple disulfide bonds on an industrial scale remains challenging. Here, we describe the soluble expression and characterization of full-length tPA by auto-induction in E. coli. Results We achieved optimal levels of gene expression, minimized negative effects related to the production of heterologous proteins, and optimized cytoplasmic yields. Three different E. coli strains, BL21 (DE3), Rosetta, and Origami 2, could express tPA using an auto-induction mechanism. In addition, similar yields of recombinant protein were produced at temperatures of 33, 35, and 37°C. The E. coli strain origami 2 could increase disulfide bond formation in cytoplasmic tPA and produce purified soluble recombinant protein (~0.9 mg/l medium). The full-length tPA was monomeric in solution, and fibrin plate assays confirmed that the recombinant tPA displayed serine protease activity. Conclusions This is the first report that describes the heterologous expression of correctly folded active full-length tPA. This could provide valuable information for using prokaryotic auto-induction expression systems to produce tPA at industrial and pharmaceutical levels without in vitro refolding during the production step.
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Affiliation(s)
- Xiaobin Long
- Department of Cardiology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China. .,Key Laboratory of Molecular Biology on Infectious Disease (Ministry of Education), The Second Affiliated Hospital, Chongqing Medical University, Chongqing, 400016, China.
| | - Yeran Gou
- Department of Cardiology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China. .,Key Laboratory of Molecular Biology on Infectious Disease (Ministry of Education), The Second Affiliated Hospital, Chongqing Medical University, Chongqing, 400016, China.
| | - Miao Luo
- Key Laboratory of Molecular Biology on Infectious Disease (Ministry of Education), The Second Affiliated Hospital, Chongqing Medical University, Chongqing, 400016, China. .,Key Laboratory of Clinical Laboratory Diagnostics (Ministry of Education), College of Laboratory Medicine, Chongqing Medical University, Chongqing, 400016, PR China. .,Department of Clinical Laboratory, Yubei District People's Hospital, Chongqing, 401120, PR China.
| | - Shaocheng Zhang
- Key Laboratory of Molecular Biology on Infectious Disease (Ministry of Education), The Second Affiliated Hospital, Chongqing Medical University, Chongqing, 400016, China. .,Key Laboratory of Clinical Laboratory Diagnostics (Ministry of Education), College of Laboratory Medicine, Chongqing Medical University, Chongqing, 400016, PR China.
| | - Hongpeng Zhang
- Key Laboratory of Molecular Biology on Infectious Disease (Ministry of Education), The Second Affiliated Hospital, Chongqing Medical University, Chongqing, 400016, China. .,Key Laboratory of Clinical Laboratory Diagnostics (Ministry of Education), College of Laboratory Medicine, Chongqing Medical University, Chongqing, 400016, PR China.
| | - Lei Bai
- Department of Cardiology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China. .,Key Laboratory of Molecular Biology on Infectious Disease (Ministry of Education), The Second Affiliated Hospital, Chongqing Medical University, Chongqing, 400016, China.
| | - Shuang Wu
- Key Laboratory of Molecular Biology on Infectious Disease (Ministry of Education), The Second Affiliated Hospital, Chongqing Medical University, Chongqing, 400016, China. .,Key Laboratory of Clinical Laboratory Diagnostics (Ministry of Education), College of Laboratory Medicine, Chongqing Medical University, Chongqing, 400016, PR China.
| | - Quan He
- Department of Cardiology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China.
| | - Ke Chen
- Key Laboratory of Molecular Biology on Infectious Disease (Ministry of Education), The Second Affiliated Hospital, Chongqing Medical University, Chongqing, 400016, China.
| | - Ailong Huang
- Key Laboratory of Molecular Biology on Infectious Disease (Ministry of Education), The Second Affiliated Hospital, Chongqing Medical University, Chongqing, 400016, China.
| | - Jianzhong Zhou
- Department of Cardiology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China.
| | - Deqiang Wang
- Key Laboratory of Molecular Biology on Infectious Disease (Ministry of Education), The Second Affiliated Hospital, Chongqing Medical University, Chongqing, 400016, China. .,Key Laboratory of Clinical Laboratory Diagnostics (Ministry of Education), College of Laboratory Medicine, Chongqing Medical University, Chongqing, 400016, PR China.
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Gable J, Acker TM, Craik CS. Current and potential treatments for ubiquitous but neglected herpesvirus infections. Chem Rev 2014; 114:11382-412. [PMID: 25275644 PMCID: PMC4254030 DOI: 10.1021/cr500255e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Indexed: 02/07/2023]
Affiliation(s)
- Jonathan
E. Gable
- Department
of Pharmaceutical Chemistry, University
of California, San Francisco, 600 16th Street, San Francisco, California 94158-2280, United States
- Graduate
Group in Biophysics, University of California,
San Francisco, 600 16th
Street, San Francisco, California 94158-2280, United States
| | - Timothy M. Acker
- Department
of Pharmaceutical Chemistry, University
of California, San Francisco, 600 16th Street, San Francisco, California 94158-2280, United States
| | - Charles S. Craik
- Department
of Pharmaceutical Chemistry, University
of California, San Francisco, 600 16th Street, San Francisco, California 94158-2280, United States
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25
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James SH, Prichard MN. Current and future therapies for herpes simplex virus infections: mechanism of action and drug resistance. Curr Opin Virol 2014; 8:54-61. [PMID: 25036916 DOI: 10.1016/j.coviro.2014.06.003] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Revised: 06/18/2014] [Accepted: 06/23/2014] [Indexed: 01/09/2023]
Abstract
Forty years after the discovery of acyclovir (ACV), it remains the mainstay of therapy for herpes simplex virus (HSV) infections. Since then, other antiviral agents have also been added to the armamentarium for these infections but ACV remains the therapy of choice. As the efficacy of ACV is reassessed, however, it is apparent that a therapy with increased efficacy, reduced potential for resistance, and improved pharmacokinetics would improve clinical outcome, particularly in high risk patients. Inhibitors of viral targets other than the DNA polymerase, such as the helicase primase complex, are of particular interest and will be valuable as new therapeutic approaches are conceived. This review focuses on currently approved HSV therapies as well as new systemic therapies in development.
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Affiliation(s)
- Scott H James
- Division of Infectious Diseases, Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Mark N Prichard
- Division of Infectious Diseases, Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL, United States.
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26
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Gable JE, Lee GM, Jaishankar P, Hearn BR, Waddling CA, Renslo AR, Craik CS. Broad-spectrum allosteric inhibition of herpesvirus proteases. Biochemistry 2014; 53:4648-60. [PMID: 24977643 PMCID: PMC4108181 DOI: 10.1021/bi5003234] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
Herpesviruses
rely on a homodimeric protease for viral capsid maturation.
A small molecule, DD2, previously shown to disrupt dimerization of
Kaposi’s sarcoma-associated herpesvirus protease (KSHV Pr)
by trapping an inactive monomeric conformation and two analogues generated
through carboxylate bioisosteric replacement (compounds 2 and 3) were shown to inhibit the associated proteases
of all three human herpesvirus (HHV) subfamilies (α, β,
and γ). Inhibition data reveal that compound 2 has
potency comparable to or better than that of DD2 against the tested
proteases. Nuclear magnetic resonance spectroscopy and a new application
of the kinetic analysis developed by Zhang and Poorman [Zhang, Z.
Y., Poorman, R. A., et al. (1991) J. Biol. Chem. 266, 15591–15594] show DD2, compound 2, and compound 3 inhibit HHV proteases by dimer disruption. All three compounds
bind the dimer interface of other HHV proteases in a manner analogous
to binding of DD2 to KSHV protease. The determination and analysis
of cocrystal structures of both analogues with the KSHV Pr monomer
verify and elaborate on the mode of binding for this chemical scaffold,
explaining a newly observed critical structure–activity relationship.
These results reveal a prototypical chemical scaffold for broad-spectrum
allosteric inhibition of human herpesvirus proteases and an approach
for the identification of small molecules that allosterically regulate
protein activity by targeting protein–protein interactions.
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Affiliation(s)
- Jonathan E Gable
- Department of Pharmaceutical Chemistry, University of California , San Francisco, California 94158-2280, United States
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27
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Arya N, Jagdale AY, Patil TA, Yeramwar SS, Holikatti SS, Dwivedi J, Shishoo CJ, Jain KS. The chemistry and biological potential of azetidin-2-ones. Eur J Med Chem 2014; 74:619-56. [PMID: 24531200 DOI: 10.1016/j.ejmech.2014.01.002] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Revised: 12/30/2013] [Accepted: 01/02/2014] [Indexed: 12/12/2022]
Abstract
Azetidin-2-ones, commonly referred as β-lactams, represent a unique ring system, with interesting chemistry and great biological potential. Besides its well known antibiotic activity, this ring system exhibits a wide range of activities, attracting the attention of researchers. The biological and pharmacological profile of azetidin-2-ones is reviewed here comprehensively with several examples under fourteen different activity heads. The chemistry and methods of synthesis have also been discussed.
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Affiliation(s)
- Nikhilesh Arya
- Department of Chemistry, Banasthali University, Tonk 304022, Rajasthan, India; Department of Pharmaceutical Chemistry, Sinhgad Institute of Pharmaceutical Sciences, Lonavala, Pune 410401, Maharashtra, India
| | - Archana Y Jagdale
- Department of Pharmaceutical Chemistry, Sinhgad Institute of Pharmaceutical Sciences, Lonavala, Pune 410401, Maharashtra, India
| | - Tushar A Patil
- Department of Pharmaceutical Chemistry, Sinhgad Institute of Pharmaceutical Sciences, Lonavala, Pune 410401, Maharashtra, India
| | - Shradha S Yeramwar
- Department of Pharmaceutical Chemistry, Sinhgad Institute of Pharmaceutical Sciences, Lonavala, Pune 410401, Maharashtra, India
| | - Sidharam S Holikatti
- Department of Pharmaceutical Chemistry, Sinhgad Institute of Pharmaceutical Sciences, Lonavala, Pune 410401, Maharashtra, India
| | - Jaya Dwivedi
- Department of Chemistry, Banasthali University, Tonk 304022, Rajasthan, India
| | - Chamanlal J Shishoo
- B.V. Patel Pharmaceutical Education and Research Development (PERD) Centre, S.G. Highway, Thaltej, Ahmedabad 380 054, Gujarat, India
| | - Kishor S Jain
- Department of Pharmaceutical Chemistry, Sinhgad Institute of Pharmaceutical Sciences, Lonavala, Pune 410401, Maharashtra, India.
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28
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Olyaei A, Sadeghpour M, Zarnegar M. Guanidine Hydrochloride Catalyzed, Rapid and Efficient One-Pot Synthesis of Naphthoxazinones Under Solvent-Free Conditions. Chem Heterocycl Compd (N Y) 2013. [DOI: 10.1007/s10593-013-1387-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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29
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Aranyi A, Ilisz I, Grecsó N, Csütörtöki R, Szatmári I, Fülöp F, Péter A. Development of the high-performance liquid chromatographic method for the enantioseparation of unusual glycine ester analogs on polysaccharide-based chiral stationary phases. J Pharm Biomed Anal 2013; 76:183-91. [DOI: 10.1016/j.jpba.2012.12.030] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Revised: 12/05/2012] [Accepted: 12/27/2012] [Indexed: 11/24/2022]
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30
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Szatmári I, Fülöp F. Syntheses, transformations and applications of aminonaphthol derivatives prepared via modified Mannich reactions. Tetrahedron 2013. [DOI: 10.1016/j.tet.2012.11.055] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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31
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Zhu X, Lee YR. RuCl2(PPh3)3-Catalyzed Facile One-Pot Synthesis of 1,2-Dihydro-1-arylnaphtho[1,2-e][1,3]oxazine-3-ones and 1,2-Dihydro-1-arylnaphtho[1,2-e][1,3]oxazine-3-thiones. B KOREAN CHEM SOC 2012. [DOI: 10.5012/bkcs.2012.33.11.3831] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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32
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Identification of a varicella-zoster virus replication inhibitor that blocks capsid assembly by interacting with the floor domain of the major capsid protein. J Virol 2012; 86:12198-207. [PMID: 22933294 DOI: 10.1128/jvi.01280-12] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A novel anti-varicella-zoster virus compound, a derivative of pyrazolo[1,5-c]1,3,5-triazin-4-one (coded as 35B2), was identified from a library of 9,600 random compounds. This compound inhibited both acyclovir (ACV)-resistant and -sensitive strains. In a plaque reduction assay under conditions in which the 50% effective concentration of ACV against the vaccine Oka strain (V-Oka) in human fibroblasts was 4.25 μM, the 50% effective concentration of 35B2 was 0.75 μM. The selective index of the compound was more than 200. Treatment with 35B2 inhibited neither immediate-early gene expression nor viral DNA synthesis. Twenty-four virus clones resistant to 35B2 were isolated, all of which had a mutation(s) in the amino acid sequence of open reading frame 40 (ORF40), which encodes the major capsid protein (MCP). Most of the mutations were located in the regions corresponding to the "floor" domain of the MCP of herpes simplex virus 1. Treatment with 35B2 changed the localization of MCP in the fibroblasts infected with V-Oka but not in the fibroblasts infected with the resistant clones, although it did not affect steady-state levels of MCP. Overexpression of the scaffold proteins restored the normal MCP localization in the 35B2-treated infected cells. The compound did not inhibit the scaffold protein-mediated translocation of MCP from the cytoplasm to the nucleus. Electron microscopic analysis demonstrated the lack of capsid formation in the 35B2-treated infected cells. These data indicate the feasibility of developing a new class of antivirals that target the herpesvirus MCPs and inhibit normal capsid formation by a mechanism that differs from those of the known protease and encapsidation inhibitors. Further biochemical studies are required to clarify the precise antiviral mechanism.
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33
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A stereoselective synthesis of symmetrical and unsymmetrical bibenzo[e][1,3]oxazine-2,2′-dione derivatives induced by low-valent titanium reagent. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.03.122] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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34
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An efficient synthesis of naphtha[1,2-e]oxazinone and 14-substituted-14H-dibenzo[a,j]xanthene derivatives promoted by zinc oxide nanoparticle under thermal and solvent-free conditions. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.03.085] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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Craik CS, Shahian T. A screening strategy for trapping the inactive conformer of a dimeric enzyme with a small molecule inhibitor. Methods Mol Biol 2012; 928:119-131. [PMID: 22956137 PMCID: PMC3739972 DOI: 10.1007/978-1-62703-008-3_9] [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] [Indexed: 06/01/2023]
Abstract
Kaposi's sarcoma-associated herpesvirus (KSHV) is the etiological agent of Kaposi's sarcoma (KS), the most common cancer in AIDS patients. All herpesviruses express a conserved dimeric serine protease that is required for generating infectious virions and is therefore of pharmaceutical interest. Given the past challenges of developing drug-like active-site inhibitors to this class of proteases, small-molecules targeting allosteric sites are of great value. In light of evidence supporting a strong structural linkage between the dimer interface and the protease active site, we have focused our efforts on the dimer interface for identifying dimer disrupting inhibitors. Here, we describe a high throughput screening approach for identifying small molecule dimerization inhibitors of KSHV protease. The helical mimetic, small molecule library used, as well as general strategies for selecting compound libraries for this application will also be discussed. This methodology can be applicable to other systems where an alpha helical moiety plays a dominant role at the interaction site of interest, and in vitro assays to monitor function are in place.
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Affiliation(s)
- Charles S Craik
- Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, CA, USA
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36
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Kumar A, Gupta MK, Kumar M. Micelle promoted supramolecular carbohydrate scaffold-catalyzed multicomponent synthesis of 1,2-dihydro-1-aryl-3H-naphth[1,2-e][1,3]oxazin-3-one and amidoalkyl naphthols derivatives in aqueous medium. RSC Adv 2012. [DOI: 10.1039/c2ra20848b] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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37
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Dou G, Sun F, Zhao X, Shi D. An Efficient Synthesis of 3,3′,4,4′-Tetrahydro-4,4′-bibenzo[e][1,3]oxazine-2,2′-dione Derivatives with the Aid of Low-valent Titanium. CHINESE J CHEM 2011. [DOI: 10.1002/cjoc.201180418] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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38
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Kumar A, Saxena A, Dewan M, De A, Mozumdar S. Recyclable nanoparticulate copper mediated synthesis of naphthoxazinones in PEG-400: a green approach. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.07.016] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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39
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ARANYI ANITA, ILISZ ISTVÁN, PATAJ ZOLTÁN, SZATMÁRI ISTVÁN, FÜLÖP FERENC, ARMSTRONG DANIELW, PÉTER ANTAL. High-performance liquid chromatographic enantioseparation of Betti base analogs on a newly developed isopropyl carbamate-cyclofructan6-based chiral stationary phase. Chirality 2011; 23:549-56. [PMID: 21681820 PMCID: PMC4306418 DOI: 10.1002/chir.20968] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2011] [Accepted: 04/12/2011] [Indexed: 11/07/2022]
Abstract
The direct separation of the enantiomers of 1-(α-aminoarylmethyl)-2-naphthol, 1-(α-aminoalkyl)-2-naphthol, 2-(α-aminoarylmethyl)-1-naphthol analogs, and 2-(1-amino-2-methylpropyl)-1-naphthol) was performed on a newly developed chiral stationary phase containing isopropyl carbamate-cyclofructan6 as chiral selector, with n-heptane/alcohol/trifluoroacetic acid as mobile phase. The effects of the mobile-phase composition, the nature and concentration of the alcoholic and acidic modifiers, and the structures of the analytes on the retention and resolution were investigated. In some cases, separations were carried out at constant mobile-phase compositions in the temperature range 5-40°C. Thermodynamic parameters and T(iso) values were calculated from plots of ln k' or ln α versus 1/T. -Δ(ΔH°) ranged from 2.8 to 3.2 kJ mol(-1) , -Δ(ΔS°) from 7.7 to 10.1 J mol(-1) K(-1) , and -Δ(ΔG°) from 0.2 to 0.5 kJ mol(-1) . It was found that the enantioseparations were enthalpy driven. The sequence of elution of the stereoisomers determined in some cases was (R) < (S).
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Affiliation(s)
- ANITA ARANYI
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary
| | - ISTVÁN ILISZ
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary
| | - ZOLTÁN PATAJ
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary
| | - ISTVÁN SZATMÁRI
- Institute of Pharmaceutical Chemistry, University of Szeged, Eötvös utca 6, H-6720 Szeged, Hungary
| | - FERENC FÜLÖP
- Institute of Pharmaceutical Chemistry, University of Szeged, Eötvös utca 6, H-6720 Szeged, Hungary
| | - DANIEL W. ARMSTRONG
- Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, TX 76019-0065, USA
| | - ANTAL PÉTER
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary
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40
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Mukherjee P, Shah F, Desai P, Avery M. Inhibitors of SARS-3CLpro: virtual screening, biological evaluation, and molecular dynamics simulation studies. J Chem Inf Model 2011; 51:1376-92. [PMID: 21604711 PMCID: PMC3929308 DOI: 10.1021/ci1004916] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
SARS-CoV from the coronaviridae family has been identified as the etiological agent of Severe Acute Respiratory Syndrome (SARS), a highly contagious upper respiratory disease that reached epidemic status in 2002. SARS-3CL(pro), a cysteine protease indispensible to the viral life cycle, has been identified as one of the key therapeutic targets against SARS. A combined ligand and structure-based virtual screening was carried out against the Asinex Platinum collection. Multiple low micromolar inhibitors of the enzyme were identified through this search, one of which also showed activity against SARS-CoV in a whole cell CPE assay. Furthermore, multinanosecond explicit solvent simulations were carried out using the docking poses of the identified hits to study the overall stability of the binding site interactions as well as identify important changes in the interaction profile that were not apparent from the docking study. Cumulative analysis of the evaluated compounds and the simulation studies led to the identification of certain protein-ligand interaction patterns which would be useful in further structure based design efforts.
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Affiliation(s)
| | - Falgun Shah
- Department of Medicinal Chemistry, School of Pharmacy, University of Mississippi, University, MS 38677
| | | | - Mitchell Avery
- Department of Medicinal Chemistry, School of Pharmacy, University of Mississippi, University, MS 38677
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41
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Pérez-Faginas P, Aranda MT, García-López MT, Snoeck R, Andrei G, Balzarini J, González-Muñiz R. Synthesis and SAR studies on azetidine-containing dipeptides as HCMV inhibitors. Bioorg Med Chem 2010; 19:1155-61. [PMID: 21256035 PMCID: PMC7127091 DOI: 10.1016/j.bmc.2010.12.052] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2010] [Accepted: 12/23/2010] [Indexed: 12/02/2022]
Abstract
SAR studies on an azetidine-containing dipeptide prototype inhibitor of HCMV are described. Three series of structurally modified analogues, involving substitutions at the N- and C-terminus, and at the C-terminal side-chain were synthesized and evaluated for antiviral activity. Aliphatic or no substituents at the C-carboxamide group, an aliphatic C-terminal side-chain, as well as a benzyloxycarbonyl moiety at the N-terminus were absolute requirements for anti-HCMV activity. The conformational restriction induced by the 2-azetidine residue into the dipeptide derivatives, identified by 1H NMR as a γ-type reverse turn, seems to have influence on the activity of these molecules.
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Affiliation(s)
- Paula Pérez-Faginas
- Instituto de Química Médica (CSIC), Juna de la Cierva, 3, 28006 Madrid, Spain
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42
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Gondal HY, Bhatti M, Gohar A, Ali M, Tahir MN. 1-Phenyl-1H-naphtho-[1,2-e][1,3]oxazin-3(2H)-one. Acta Crystallogr Sect E Struct Rep Online 2010; 66:o2555. [PMID: 21587542 PMCID: PMC2983264 DOI: 10.1107/s1600536810035841] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2010] [Accepted: 09/06/2010] [Indexed: 11/10/2022]
Abstract
In the title compound, C18H13NO2, the naphthalene (r.m.s. deviation = 0.025 Å) and benzaldehyde (r.m.s. deviation = 0.006 Å) groups are oriented at a dihedral angle of 89.48 (4)°. The oxazine group is oriented at dihedral angles of 13.36 (4) and 85.08 (5)°, respectively, with respect to the naphthalene and benzaldehyde fragments. In the crystal, inversion dimers linked by pairs of C—H⋯O hydrogen bonds generate R22(8) loops. The dimers are linked into [010] chains via N—H⋯O hydrogen bonds. Weak C—H⋯π links and aromatic π–π stacking between the centroids of the naphthalene phenyl rings [centroid–centroid separation = 3.5977 (8) Å] help to consolidate the packing.
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43
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Shen A. Allosteric regulation of protease activity by small molecules. MOLECULAR BIOSYSTEMS 2010; 6:1431-43. [PMID: 20539873 DOI: 10.1039/c003913f] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Proteases regulate a plethora of biological processes. Because they irreversibly cleave peptide bonds, the activity of proteases is strictly controlled. While there are many ways to regulate protease activity, an emergent mechanism is the modulation of protease function by small molecules acting at allosteric sites. This mode of regulation holds the potential to allow for the specific and temporal control of a given biological process using small molecules. These compounds also serve as useful tools for studying protein dynamics and function. This review highlights recent advances in identifying and characterizing natural and synthetic small molecule allosteric regulators of proteases and discusses their utility in studies of protease function, drug discovery and protein engineering.
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Affiliation(s)
- Aimee Shen
- Department of Pathology, Stanford School of Medicine, Stanford, California 94305, USA.
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44
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Affiliation(s)
- Bimal K. Banik
- Dept. Chemistry, University of Texas-Pan American, W. University Drive 1201, Edinburg, 78539 USA
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45
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Jiang C, Geng X, Zhang Z, Xu H, Wang C. Chlorotrimethylsilane-Promoted Synthesis of 1,2-Dihydro-1-Arylnaphtho [1,2-e] [1,3]Oxazine-3-Ones. JOURNAL OF CHEMICAL RESEARCH 2010. [DOI: 10.3184/030823409x12615635710356] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Chlorotrimethylsilane (TMSCI) is effective as a catalyst for the preparation of 1,2-dihydro-1-arylnaphtho[1,2-e] [1,3]oxazine-3- ones using a one-pot condensation of 2-naphthol, aromatic aldehydes and urea in DMF as solvent. The reaction times, temperature, and catalyst amounts were varied.
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Affiliation(s)
- Chenggang Jiang
- College of Chemistry and Chemical Technology, Yangzhou University, Yangzhou 225002, P. R. China
| | - Xin Geng
- College of Chemistry and Chemical Technology, Yangzhou University, Yangzhou 225002, P. R. China
| | - Zonglei Zhang
- College of Chemistry and Chemical Technology, Yangzhou University, Yangzhou 225002, P. R. China
| | - Hangxian Xu
- College of Chemistry and Chemical Technology, Yangzhou University, Yangzhou 225002, P. R. China
| | - Cunde Wang
- College of Chemistry and Chemical Technology, Yangzhou University, Yangzhou 225002, P. R. China
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46
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Kantevari S, Vuppalapati SVN, Bantu R, Nagarapu L. An efficient one-pot three component synthesis of 1,2-dihydro-1-arylnaphtho[1,2-e][1,3]oxazine-3-ones using montmorillonite k10 under solvent free conditions. J Heterocycl Chem 2010. [DOI: 10.1002/jhet.312] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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47
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Yadav LDS, Rai A, Rai VK, Awasthi C. Cu(OTf)2-catalysed synthesis of structurally novel bicyclic 1,3-oxazines via condensation-dehydrazinative ring transformation cascades. JOURNAL OF CHEMICAL RESEARCH 2009. [DOI: 10.3184/030823409x466753] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The Cu(OTf)2-catalysed expeditious synthesis of 1,3-oxazin-2-ones(thiones) from unprotected D-glucose and D-xylose in excellent yields is reported. Cu(OTf)2 plays a dual role of a Lewis acid and an oxidant for dehydrazination, which is the cornerstone in the present investigation. The 1,3-oxazin-2-ones(thiones) serve as synthons for diversity oriented synthesis of structurally distinct bicyclic 1,3-oxazin-2-ones(thiones), when subjected to Malaprade reaction, followed by Cu(OTf)2-catalysed cyclisation with an appropriate traditional reagent such as phenylhydrazine, amidines, hydroxylamine, or semi(thiosemi)carbazide.
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Affiliation(s)
- Lal Dhar Singh Yadav
- Green Synthesis Laboratory, Department of Chemistry, University of Allahbad, Allahabad 211 002, India
| | - Ankita Rai
- Green Synthesis Laboratory, Department of Chemistry, University of Allahbad, Allahabad 211 002, India
| | - Vijai Kumar Rai
- Green Synthesis Laboratory, Department of Chemistry, University of Allahbad, Allahabad 211 002, India
| | - Chhama Awasthi
- Green Synthesis Laboratory, Department of Chemistry, University of Allahbad, Allahabad 211 002, India
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48
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Shahian T, Lee GM, Lazic A, Arnold LA, Velusamy P, Roels CM, Guy RK, Craik CS. Inhibition of a viral enzyme by a small-molecule dimer disruptor. Nat Chem Biol 2009; 5:640-6. [PMID: 19633659 PMCID: PMC2752665 DOI: 10.1038/nchembio.192] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2009] [Accepted: 05/18/2009] [Indexed: 11/03/2022]
Abstract
Small molecule dimer disruptors that inhibit an essential dimeric protease of human Kaposi’s sarcoma-associated herpesvirus (KSHV) were identified by screening an α-helical mimetic library. Subsequently, a second generation of low micromolar inhibitors with improved potency and solubility was synthesized. Complementary methods including size exclusion chromatography and 1H-13C HSQC titration using selectively labeled 13C-Met samples revealed that monomeric protease is enriched in the presence of inhibitor. 1H-15N-HSQC titration studies mapped the inhibitor binding-site to the dimer interface, and mutagenesis studies targeting this region were consistent with a mechanism where inhibitor binding prevents dimerization through the conformational selection of a dynamic intermediate. These results validate the interface of herpesvirus proteases and other similar oligomeric interactions as suitable targets for the development of small molecule inhibitors.
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Affiliation(s)
- Tina Shahian
- Graduate Group in Biochemistry and Molecular Biology, University of California, San Francisco, California, USA
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Larrat S, Morand P, Bas A, Vigne S, Crance JM, Boyer V, Nicod S, Grossi L, Buisson M, Burmeister WP, Seigneurin JM, Germi R. Inhibition of Epstein–Barr virus replication by small interfering RNA targeting the Epstein–Barr virus protease gene. Antivir Ther 2009. [DOI: 10.1177/135965350901400508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background The Epstein–Barr virus (EBV) protease (PR), coded by the BVRF2 gene, is essential for the maturation of the viral capsid and viral DNA packaging during the late stage of the EBV lytic cycle. Like the other herpesvirus serine PRs, EBV PR could be a target for the inhibition of EBV replication. To date, no data have been reported on the inhibition of EBV PR messenger RNA (mRNA) by small interfering RNA (siRNA). Methods In this study, siRNAs targeting EBV PR were delivered to the epithelial 293 cell line stably transfected with the complete B95-8 EBV episome. EBV DNA and PR mRNA were quantified by real-time PCR in cells and supernatant, protein expression was assessed by immunoblotting, and production of EBV infectious particles in the culture medium was measured by Raji cell superinfection. Results The EBV PR mRNA within the cells was reduced by 73%, the PR protein by 35% and the amount of virus in the cell supernatant was drastically decreased by 86% or 95%, depending on the method. Conclusions The strong effect of the siRNA targeting EBV PR on EBV replication attests to the crucial role played by EBV PR in the production of infectious particles and suggests that targeting this enzyme can be a new strategy against EBV-associated diseases where virus replication occurs.
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Affiliation(s)
- Sylvie Larrat
- UMI 3265, UJF-EMBL-CNRS, Unit of Virus Host Cell Interactions, Grenoble, France
- Département de Virologie, Centre Hospitalier Universitaire, Grenoble, France
| | - Patrice Morand
- UMI 3265, UJF-EMBL-CNRS, Unit of Virus Host Cell Interactions, Grenoble, France
- Département de Virologie, Centre Hospitalier Universitaire, Grenoble, France
| | - Ariane Bas
- UMI 3265, UJF-EMBL-CNRS, Unit of Virus Host Cell Interactions, Grenoble, France
- Département de Virologie, Centre Hospitalier Universitaire, Grenoble, France
| | - Solenne Vigne
- Unité de Virologie, Centre de Recherches du Service de Santé des Armées, Grenoble, France
| | - Jean-Marc Crance
- Unité de Virologie, Centre de Recherches du Service de Santé des Armées, Grenoble, France
| | - Véronique Boyer
- UMI 3265, UJF-EMBL-CNRS, Unit of Virus Host Cell Interactions, Grenoble, France
| | - Sandrine Nicod
- Département de Virologie, Centre Hospitalier Universitaire, Grenoble, France
| | - Laurence Grossi
- UMI 3265, UJF-EMBL-CNRS, Unit of Virus Host Cell Interactions, Grenoble, France
| | - Marlyse Buisson
- UMI 3265, UJF-EMBL-CNRS, Unit of Virus Host Cell Interactions, Grenoble, France
- Département de Virologie, Centre Hospitalier Universitaire, Grenoble, France
| | - Wim P Burmeister
- UMI 3265, UJF-EMBL-CNRS, Unit of Virus Host Cell Interactions, Grenoble, France
| | - Jean-Marie Seigneurin
- UMI 3265, UJF-EMBL-CNRS, Unit of Virus Host Cell Interactions, Grenoble, France
- Département de Virologie, Centre Hospitalier Universitaire, Grenoble, France
| | - Raphaële Germi
- UMI 3265, UJF-EMBL-CNRS, Unit of Virus Host Cell Interactions, Grenoble, France
- Département de Virologie, Centre Hospitalier Universitaire, Grenoble, France
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Yadav LDS, Rai VK. An expeditious synthesis of benzoxazine-2-thione c-nucleosides Via Cu(OTf)2-mediated dehydrazinative beta-glycosylation. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2009; 27:1227-37. [PMID: 19003568 DOI: 10.1080/15257770802458212] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
A novel expeditious synthetic protocol for 1,3-benzoxazine-2-thione C-nucleosides via Cu(OTf)2-mediated dehydrazinative beta-glycosylation of 4-hydrazino-2H-benz[e]-1,3-oxazine-2-thiones with unprotected D-ribose is reported.
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Affiliation(s)
- Lal Dhar S Yadav
- Green Synthesis Lab, Department of Chemistry, University of Allahabad, Allahabad, India.
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