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Steuten K, Kim H, Widen JC, Babin BM, Onguka O, Lovell S, Bolgi O, Cerikan B, Neufeldt CJ, Cortese M, Muir RK, Bennett JM, Geiss-Friedlander R, Peters C, Bartenschlager R, Bogyo M. Challenges for Targeting SARS-CoV-2 Proteases as a Therapeutic Strategy for COVID-19. ACS Infect Dis 2021; 7:1457-1468. [PMID: 33570381 PMCID: PMC7901237 DOI: 10.1021/acsinfecdis.0c00815] [Citation(s) in RCA: 64] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2020] [Indexed: 12/31/2022]
Abstract
Two proteases produced by the SARS-CoV-2 virus, the main protease and papain-like protease, are essential for viral replication and have become the focus of drug development programs for treatment of COVID-19. We screened a highly focused library of compounds containing covalent warheads designed to target cysteine proteases to identify new lead scaffolds for both Mpro and PLpro proteases. These efforts identified a small number of hits for the Mpro protease and no viable hits for the PLpro protease. Of the Mpro hits identified as inhibitors of the purified recombinant protease, only two compounds inhibited viral infectivity in cellular infection assays. However, we observed a substantial drop in antiviral potency upon expression of TMPRSS2, a transmembrane serine protease that acts in an alternative viral entry pathway to the lysosomal cathepsins. This loss of potency is explained by the fact that our lead Mpro inhibitors are also potent inhibitors of host cell cysteine cathepsins. To determine if this is a general property of Mpro inhibitors, we evaluated several recently reported compounds and found that they are also effective inhibitors of purified human cathepsins L and B and showed similar loss in activity in cells expressing TMPRSS2. Our results highlight the challenges of targeting Mpro and PLpro proteases and demonstrate the need to carefully assess selectivity of SARS-CoV-2 protease inhibitors to prevent clinical advancement of compounds that function through inhibition of a redundant viral entry pathway.
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Affiliation(s)
- Kas Steuten
- Department of Pathology, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, California 94305, United States
| | - Heeyoung Kim
- Department of Infectious Diseases, Molecular Virology, University Hospital Heidelberg, Heidelberg, Germany
- German Center for Infection Research (DZIF), Heidelberg partner site, Heidelberg, Germany
| | - John C. Widen
- Department of Pathology, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, California 94305, United States
| | - Brett M. Babin
- Department of Pathology, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, California 94305, United States
| | - Ouma Onguka
- Department of Pathology, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, California 94305, United States
| | - Scott Lovell
- Department of Pathology, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, California 94305, United States
| | - Oguz Bolgi
- Institute of Molecular Medicine and Cell Research, University of Freiburg, Freiburg, Germany
| | - Berati Cerikan
- Department of Infectious Diseases, Molecular Virology, University Hospital Heidelberg, Heidelberg, Germany
| | - Christopher J. Neufeldt
- Department of Infectious Diseases, Molecular Virology, University Hospital Heidelberg, Heidelberg, Germany
| | - Mirko Cortese
- Department of Infectious Diseases, Molecular Virology, University Hospital Heidelberg, Heidelberg, Germany
| | - Ryan K. Muir
- Department of Pathology, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, California 94305, United States
| | - John M. Bennett
- Department of Pathology, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, California 94305, United States
| | - Ruth Geiss-Friedlander
- Institute of Molecular Medicine and Cell Research, University of Freiburg, Freiburg, Germany
| | - Christoph Peters
- Institute of Molecular Medicine and Cell Research, University of Freiburg, Freiburg, Germany
| | - Ralf Bartenschlager
- Department of Infectious Diseases, Molecular Virology, University Hospital Heidelberg, Heidelberg, Germany
- Division Virus-Associated Carcinogenesis, German Cancer Research Center (DKFZ), Heidelberg, German
- German Center for Infection Research (DZIF), Heidelberg partner site, Heidelberg, Germany
| | - Matthew Bogyo
- Department of Pathology, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, California 94305, United States
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Neelakantan H, Vance V, Wang HYL, McHardy SF, Watowich SJ. Noncoupled Fluorescent Assay for Direct Real-Time Monitoring of Nicotinamide N-Methyltransferase Activity. Biochemistry 2017; 56:824-832. [DOI: 10.1021/acs.biochem.6b01215] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Harshini Neelakantan
- Department
of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, Texas 77555, United States
| | - Virginia Vance
- Department
of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, Texas 77555, United States
| | - Hua-Yu Leo Wang
- Center
for Innovative Drug Discovery, Department of Chemistry, University of Texas at San Antonio, San Antonio, Texas 78249, United States
| | - Stanton F. McHardy
- Center
for Innovative Drug Discovery, Department of Chemistry, University of Texas at San Antonio, San Antonio, Texas 78249, United States
| | - Stanley J. Watowich
- Department
of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, Texas 77555, United States
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Ulanday GEL, Okamoto K, Morita K. Development and utility of an in vitro, fluorescence-based assay for the discovery of novel compounds against dengue 2 viral protease. Trop Med Health 2016; 44:22. [PMID: 27551237 PMCID: PMC4979183 DOI: 10.1186/s41182-016-0025-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 07/18/2016] [Indexed: 11/27/2022] Open
Abstract
Background Dengue disease is one of the most significant vector-borne illnesses in the world. The emergence and re-emergence of dengue infections in many parts of the world affect millions annually and continue to burden public health systems especially in low-income populations. Advances in dengue vaccine development showed promising results; however, protection seems to be suboptimal. There is no licensed chemotherapeutic agent against dengue to date. An ideal scenario of combinatorial vaccination of high-risk individuals and chemotherapy of the diseased during outbreaks may compensate for the meager protection offered by the vaccine. The dengue virus protease is important to viral replication and, as such, has been identified as a potential target for antivirals. It is, therefore, our objective to establish and optimize an appropriate screening method for use during the early stages of drug development for dengue. Methods In this study, we developed and optimized a biochemical assay system for use in screening compound libraries against dengue virus protease. We tested the selected protease inhibitors with a cell-based assay to determine inhibition of viral replication. Results We have presented direct plots of substrate kinetics data showing an apparent inhibition of the protease at excessive substrate concentrations. The most common sources of interference that may have affected the said observation were elucidated. Finally, a screen was done on an existing compound library using the developed method. The compounds selected in this study showed inhibitory activity against both the recombinant dengue protease and cell-based infectivity assays. Conclusions Our study shows the practicality of a customized biochemical assay to find possible inhibitors of dengue viral protease during the initial stages of drug discovery. Electronic supplementary material The online version of this article (doi:10.1186/s41182-016-0025-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Gianne Eduard L Ulanday
- Department of Virology, Institute of Tropical Medicine, Nagasaki University, 1-12-4 Sakamoto, Nagasaki, 852-8523 Japan ; Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
| | - Kenta Okamoto
- Department of Virology, Institute of Tropical Medicine, Nagasaki University, 1-12-4 Sakamoto, Nagasaki, 852-8523 Japan
| | - Kouichi Morita
- Department of Virology, Institute of Tropical Medicine, Nagasaki University, 1-12-4 Sakamoto, Nagasaki, 852-8523 Japan ; Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan ; Leading Graduate School Program, Nagasaki University, Nagasaki, Japan
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Viswanathan U, Tomlinson SM, Fonner JM, Mock SA, Watowich SJ. Identification of a novel inhibitor of dengue virus protease through use of a virtual screening drug discovery Web portal. J Chem Inf Model 2014; 54:2816-25. [PMID: 25263519 DOI: 10.1021/ci500531r] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We report the discovery of a novel small-molecule inhibitor of the dengue virus (DENV) protease (NS2B-NS3pro) using a newly constructed Web-based portal (DrugDiscovery@TACC) for structure-based virtual screening. Our drug discovery portal, an extension of virtual screening studies performed using IBM's World Community Grid, facilitated access to supercomputer resources managed by the Texas Advanced Computing Center (TACC) and enabled druglike commercially available small-molecule libraries to be rapidly screened against several high-resolution DENV NS2B-NS3pro crystallographic structures. Detailed analysis of virtual screening docking scores and hydrogen-bonding interactions between each docked ligand and the NS2B-NS3pro Ser135 side chain were used to select molecules for experimental validation. Compounds were ordered from established chemical companies, and compounds with established aqueous solubility were tested for their ability to inhibit DENV NS2B-NS3pro cleavage of a model substrate in kinetic studies. As a proof-of-concept, we validated a small-molecule dihydronaphthalenone hit as a single-digit-micromolar mixed noncompetitive inhibitor of the DENV protease. Since the dihydronaphthalenone was predicted to interact with NS2B-NS3pro residues that are largely conserved between DENV and the related West Nile virus (WNV), we tested this inhibitor against WNV NS2B-NS3pro and observed a similar mixed noncompetitive inhibition mechanism. However, the inhibition constants were ∼10-fold larger against the WNV protease relative to the DENV protease. This novel validated lead had no chemical features or pharmacophores associated with adverse toxicity, carcinogenicity, or mutagenicity risks and thus is attractive for additional characterization and optimization.
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Affiliation(s)
- Usha Viswanathan
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch , Galveston, Texas 77555, United States
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Recent Advances in Targeting Dengue and West Nile Virus Proteases Using Small Molecule Inhibitors. TOPICS IN MEDICINAL CHEMISTRY 2014. [DOI: 10.1007/7355_2014_46] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Garces AP, Watowich SJ. Intrinsic Flexibility of West Nile Virus Protease in Solution Characterized Using Small-Angle X-ray Scattering. Biochemistry 2013; 52:6856-65. [DOI: 10.1021/bi400782w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andrea P. Garces
- Department of Biochemistry
and Molecular Biology, University of Texas Medical Branch, Galveston, Texas 77555, United States
| | - Stanley J. Watowich
- Department of Biochemistry
and Molecular Biology, University of Texas Medical Branch, Galveston, Texas 77555, United States
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Heh CH, Othman R, Buckle MJC, Sharifuddin Y, Yusof R, Rahman NA. Rational Discovery of Dengue Type 2 Non-Competitive Inhibitors. Chem Biol Drug Des 2013; 82:1-11. [DOI: 10.1111/cbdd.12122] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Revised: 01/16/2013] [Accepted: 02/12/2013] [Indexed: 12/14/2022]
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8
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Samanta S, Cui T, Lam Y. Discovery, synthesis, and in vitro evaluation of West Nile virus protease inhibitors based on the 9,10-dihydro-3H,4aH-1,3,9,10a-tetraazaphenanthren-4-one scaffold. ChemMedChem 2012; 7:1210-6. [PMID: 22550001 DOI: 10.1002/cmdc.201200136] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2012] [Revised: 04/05/2012] [Indexed: 11/07/2022]
Abstract
West Nile virus (WNV), a member of the Flaviviridae family, is a mosquito-borne pathogen that causes a great number of human infections each year. Neither vaccines nor antiviral therapies are currently available for human use. In this study, a WNV NS2B-NS3 protease inhibitor with a 9,10-dihydro-3H,4aH-1,3,9,10a-tetraazaphenanthren-4-one scaffold was identified by screening a small library of non-peptidic compounds. This initial hit was optimized by solution-phase synthesis and screening of a focused library of compounds bearing this scaffold. This led to the identification of a novel, uncompetitive inhibitor (1a40, IC(50) = 5.41±0.45 μM) of WNV NS2B-NS3 protease. Molecular docking of this chiral compound onto the WNV protease indicates that the S enantiomer of 1a40 appears to interfere with the productive interactions between the NS2B cofactor and the NS3 protease domain; (S)-1a40 is a preferred isomer for inhibition of WNV NS3 protease.
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Affiliation(s)
- Sanjay Samanta
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore
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Tomlinson SM, Watowich SJ. Use of parallel validation high-throughput screens to reduce false positives and identify novel dengue NS2B-NS3 protease inhibitors. Antiviral Res 2012; 93:245-252. [PMID: 22193283 PMCID: PMC3266433 DOI: 10.1016/j.antiviral.2011.12.003] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2011] [Revised: 12/05/2011] [Accepted: 12/06/2011] [Indexed: 01/10/2023]
Abstract
Dengue virus (DENV), a mosquito-borne member of the family Flaviviridae, is a significant global pathogen affecting primarily tropical and subtropical regions of the world and placing tremendous burden on the limited medical infrastructure that exists in many of the developing countries located within these regions. Recent outbreaks in developed countries, including Australia (Hanna et al., 2009), France (La Ruche et al., 2010), Taiwan (Kuan et al., 2010), and the USA (CDC, 2010), lead many researchers to believe that continued emergence into more temperate latitudes is likely. A primary concern is that there are no approved vaccines or antiviral therapies to treat DENV infections. Since the viral NS2B-NS3 protease (DENV NS2B-NS3pro) is required for virus replication, it provides a strategic target for the development of antiviral drugs. In this study, proof-of-concept high-throughput screenings (HTSs) were performed to unambiguously identify dengue 2 virus (DEN2V) NS2B-NS3pro inhibitors from a library of 2000 compounds. Validation screens were performed in parallel to concurrently eliminate insoluble, auto-fluorescing, and/or nonspecific inhibitors. Kinetic analyses of the hits revealed that parallel substrate fluorophore (AMC) interference controls and trypsin inhibition controls were able to reduce false positive rates due to solubility and fluorophore interference while the trypsin inhibition control additionally eliminated non-specific inhibitors. We identified five DEN2V NS2B-NS3pro inhibitors that also inhibited the related West Nile virus (WNV) protease (NS2B-NS3pro), but did not inhibit the trypsin protease. Biochemical analyses revealed various mechanisms of inhibition including competitive and mixed noncompetitive inhibition, with the lowest K(i) values being 12±1.5 μM for DEN2V NS2B-NS3pro and 2±0.2 μM for WNV NS2B-NS3pro.
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Affiliation(s)
- Suzanne M Tomlinson
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, TX 77555, United States
| | - Stanley J Watowich
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, TX 77555, United States.
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Knehans T, Schüller A, Doan DN, Nacro K, Hill J, Güntert P, Madhusudhan MS, Weil T, Vasudevan SG. Structure-guided fragment-based in silico drug design of dengue protease inhibitors. J Comput Aided Mol Des 2011; 25:263-74. [DOI: 10.1007/s10822-011-9418-0] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2010] [Accepted: 02/07/2011] [Indexed: 11/24/2022]
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Tomlinson SM, Watowich SJ. Anthracene-based inhibitors of dengue virus NS2B-NS3 protease. Antiviral Res 2010; 89:127-35. [PMID: 21185332 DOI: 10.1016/j.antiviral.2010.12.006] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2010] [Revised: 12/14/2010] [Accepted: 12/15/2010] [Indexed: 11/18/2022]
Abstract
Dengue virus (DENV) is a mosquito-borne flavivirus that has strained global healthcare systems throughout tropical and subtropical regions of the world. In addition to plaguing developing nations, it has re-emerged in several developed countries with recent outbreaks in the USA (CDC, 2010), Australia (Hanna et al., 2009), Taiwan (Kuan et al., 2010) and France (La Ruche et al., 2010). DENV infection can cause significant disease, including dengue fever, dengue hemorrhagic fever, dengue shock syndrome, and death. There are no approved vaccines or antiviral therapies to prevent or treat dengue-related illnesses. However, the viral NS2B-NS3 protease complex provides a strategic target for antiviral drug development since NS3 protease activity is required for virus replication. Recently, we reported two compounds with inhibitory activity against the DENV protease in vitro and antiviral activity against dengue 2 (DEN2V) in cell culture (Tomlinson et al., 2009a). Analogs of one of the lead compounds were purchased, tested in protease inhibition assays, and the data evaluated with detailed kinetic analyses. A structure activity relationship (SAR) identified key atomic determinants (i.e. functional groups) important for inhibitory activity. Four "second series" analogs were selected and tested to validate our SAR and structural models. Here, we report improvements to inhibitory activity ranging between ∼2- and 60-fold, resulting in selective low micromolar dengue protease inhibitors.
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Affiliation(s)
- Suzanne M Tomlinson
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, TX 77555, United States
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Ugwumba IN, Ozawa K, de la Cruz L, Xu ZQ, Herlt AJ, Hadler KS, Coppin C, Brown SE, Schenk G, Oakeshott JG, Otting G. Using a genetically encoded fluorescent amino acid as a site-specific probe to detect binding of low-molecular-weight compounds. Assay Drug Dev Technol 2010; 9:50-7. [PMID: 21050031 DOI: 10.1089/adt.2010.0306] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Development of enzyme inhibitors requires an activity assay for the identification of hits and lead compounds. To determine dissociation constants in a straightforward manner, we explored the use of a genetically encoded fluorescent amino acid for site-specific tagging of the target protein. The unnatural amino acid 7-(hydroxy-coumarin-4-yl) ethylglycine (Hco) was site-specifically incorporated in the target protein by cell-free protein synthesis using an orthogonal amber suppressor tRNA/aminoacyl-tRNA synthetase pair. Using the West Nile virus nonstructural protein 2B-nonstructural protein 3 protease as the target protein, the fluorescence of Hco-tagged samples proved to be exquisitely sensitive to the presence of inhibitors and small ligand molecules if they bind in the vicinity of the Hco residue. No significant change in fluorescence was observed when the ligand-binding site was far from the Hco residue. Hco-tagged proteins thus combine outstanding sensitivity with accurate information on the site of binding, making Hco labeling an attractive tool in drug discovery.
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Affiliation(s)
- Isaac N Ugwumba
- Commonwealth Scientific and Industrial Research Organization, Black Mountain Laboratories, Canberra, ACT 0200, Australia
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Shiryaev SA, Cheltsov AV, Gawlik K, Ratnikov BI, Strongin AY. Virtual ligand screening of the National Cancer Institute (NCI) compound library leads to the allosteric inhibitory scaffolds of the West Nile Virus NS3 proteinase. Assay Drug Dev Technol 2010; 9:69-78. [PMID: 21050032 DOI: 10.1089/adt.2010.0309] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Viruses of the genus Flavivirus are responsible for significant human disease and mortality. The N-terminal domain of the flaviviral nonstructural (NS)3 protein codes for the serine, chymotrypsin-fold proteinase (NS3pro). The presence of the nonstructural (NS)2B cofactor, which is encoded by the upstream gene in the flaviviral genome, is necessary for NS3pro to exhibit its proteolytic activity. The two-component NS2B-NS3pro functional activity is essential for the viral polyprotein processing and replication. Both the structure and the function of NS2B-NS3pro are conserved in the Flavivirus family. Because of its essential function in the posttranslational processing of the viral polyprotein precursor, NS2B-NS3pro is a promising target for anti-flavivirus drugs. To identify selective inhibitors with the reduced cross-reactivity and off-target effects, we focused our strategy on the allosteric inhibitors capable of targeting the NS2B-NS3pro interface rather than the NS3pro active site. Using virtual ligand screening of the diverse, ∼275,000-compound library and the catalytic domain of the two-component West Nile virus (WNV) NS2B-NS3pro as a receptor, we identified a limited subset of the novel inhibitory scaffolds. Several of the discovered compounds performed as allosteric inhibitors and exhibited a nanomolar range potency in the in vitro cleavage assays. The inhibitors were also potent in cell-based assays employing the sub-genomic, luciferase-tagged WNV and Dengue viral replicons. The selectivity of the inhibitors was confirmed using the in vitro cleavage assays with furin, a human serine proteinase, the substrate preferences of which are similar to those of WNV NS2B-NS3pro. Conceptually, the similar in silico drug discovery strategy may be readily employed for the identification of inhibitors of other flaviviruses.
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Affiliation(s)
- Sergey A Shiryaev
- Inflammatory and Infectious Disease Center, Sanford-Burnham Medical Research Institute, 10901 N. Torrey Pines Road, La Jolla, CA 92037, USA
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Ekonomiuk D, Su XC, Ozawa K, Bodenreider C, Lim SP, Otting G, Huang D, Caflisch A. Flaviviral protease inhibitors identified by fragment-based library docking into a structure generated by molecular dynamics. J Med Chem 2009; 52:4860-8. [PMID: 19572550 DOI: 10.1021/jm900448m] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Fragment-based docking was used to select a conformation for virtual screening from a molecular dynamics trajectory of the West Nile virus nonstructural 3 protease. This conformation was chosen from an ensemble of 100 molecular dynamics snapshots because it optimally accommodates benzene, the most common ring in known drugs, and two positively charged fragments (methylguanidinium and 2-phenylimidazoline). The latter fragments were used as probes because of the large number of hydrogen bond acceptors in the substrate binding site of the protease. Upon high-throughput docking of a diversity set of 18,694 molecules and pose filtering, only five compounds were chosen for experimental validation, and two of them are active in the low micromolar range in an enzymatic assay and a tryptophan fluorescence quenching assay. Evidence for specific binding to the protease active site is provided by nuclear magnetic resonance spectroscopy. The two inhibitors have different scaffolds (diphenylurea and diphenyl ester) and are promising lead candidates because they have a molecular weight of about 300 Da.
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Affiliation(s)
- Dariusz Ekonomiuk
- Department of Biochemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
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Sidique S, Shiryaev SA, Ratnikov BI, Herath A, Su Y, Strongin AY, Cosford NDP. Structure-activity relationship and improved hydrolytic stability of pyrazole derivatives that are allosteric inhibitors of West Nile Virus NS2B-NS3 proteinase. Bioorg Med Chem Lett 2009; 19:5773-7. [PMID: 19703770 DOI: 10.1016/j.bmcl.2009.07.150] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2009] [Revised: 07/28/2009] [Accepted: 07/30/2009] [Indexed: 10/20/2022]
Abstract
West Nile Virus (WNV) is a potentially deadly mosquito-borne flavivirus which has spread rapidly throughout the world. Currently there is no effective vaccine against flaviviral infections. We previously reported the identification of pyrazole ester derivatives as allosteric inhibitors of WNV NS2B-NS3 proteinase. These compounds degrade rapidly in pH 8 buffer with a half life of 1-2h. We now report the design, synthesis and in vitro evaluation of pyrazole derivatives that are inhibitors of WNV NS2B-NS3 proteinase with greatly improved stability in the assay medium.
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Affiliation(s)
- Shyama Sidique
- Conrad Prebys Center for Chemical Genomics, 10901 N. Torrey Pines Road, La Jolla, CA 92037, USA
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Discovery of a non-peptidic inhibitor of west nile virus NS3 protease by high-throughput docking. PLoS Negl Trop Dis 2009; 3:e356. [PMID: 19159012 PMCID: PMC2613028 DOI: 10.1371/journal.pntd.0000356] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2008] [Accepted: 12/14/2008] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND The non-structural 3 protease (NS3pro) is an essential flaviviral enzyme and therefore one of the most promising targets for drug development against West Nile virus (WNV) and dengue infections. METHODOLOGY In this work, a small-molecule inhibitor of the WNV NS3pro has been identified by automatic fragment-based docking of about 12000 compounds and testing by nuclear magnetic resonance (NMR) spectroscopy of only 22 molecules. Specific binding of the inhibitor into the active site of NS3pro and its binding mode are confirmed by 15N-HSQC NMR spectra. The inhibitory activity is further validated by an enzymatic assay and a tryptophan fluorescence quenching assay. CONCLUSION The inhibitor [4-(carbamimidoylsulfanylmethyl)-2,5-dimethylphenyl]-methylsulfanylmethanimidamide has a good ratio of binding affinity versus molecular weight (ligand efficiency of 0.33 kcal/mol per non-hydrogen atom), and thus has good potential as lead compound for further development to combat West Nile virus infections.
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