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  1. Article ; Online: Structural analysis of the putative SARS-CoV-2 primase complex.

    Konkolova, Eva / Klima, Martin / Nencka, Radim / Boura, Evzen

    Journal of structural biology

    2020  Volume 211, Issue 2, Page(s) 107548

    Abstract: We report the crystal structure of the SARS-CoV-2 putative primase composed of the nsp7 and nsp8 proteins. We observed a dimer of dimers (2:2 nsp7-nsp8) in the crystallographic asymmetric unit. The structure revealed a fold with a helical core of the ... ...

    Abstract We report the crystal structure of the SARS-CoV-2 putative primase composed of the nsp7 and nsp8 proteins. We observed a dimer of dimers (2:2 nsp7-nsp8) in the crystallographic asymmetric unit. The structure revealed a fold with a helical core of the heterotetramer formed by both nsp7 and nsp8 that is flanked with two symmetry-related nsp8 β-sheet subdomains. It was also revealed that two hydrophobic interfaces one of approx. 1340 Å
    MeSH term(s) Betacoronavirus/chemistry ; Binding Sites ; Coronavirus RNA-Dependent RNA Polymerase ; Crystallography, X-Ray ; DNA Primase/chemistry ; DNA Primase/metabolism ; Models, Molecular ; Multiprotein Complexes ; Protein Conformation ; Protein Multimerization ; RNA/metabolism ; SARS-CoV-2 ; Viral Nonstructural Proteins/chemistry ; Viral Nonstructural Proteins/metabolism
    Chemical Substances Multiprotein Complexes ; NS8 protein, SARS-CoV-2 ; Viral Nonstructural Proteins ; RNA (63231-63-0) ; DNA Primase (EC 2.7.7.-) ; Coronavirus RNA-Dependent RNA Polymerase (EC 2.7.7.48) ; NSP7 protein, SARS-CoV-2 (EC 2.7.7.48)
    Keywords covid19
    Language English
    Publishing date 2020-06-11
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1032718-6
    ISSN 1095-8657 ; 1047-8477
    ISSN (online) 1095-8657
    ISSN 1047-8477
    DOI 10.1016/j.jsb.2020.107548
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Non-Nucleotide RNA-Dependent RNA Polymerase Inhibitor That Blocks SARS-CoV-2 Replication.

    Dejmek, Milan / Konkoľová, Eva / Eyer, Luděk / Straková, Petra / Svoboda, Pavel / Šála, Michal / Krejčová, Kateřina / Růžek, Daniel / Boura, Evzen / Nencka, Radim

    Viruses

    2021  Volume 13, Issue 8

    Abstract: SARS-CoV-2 has caused an extensive pandemic of COVID-19 all around the world. Key viral enzymes are suitable molecular targets for the development of new antivirals against SARS-CoV-2 which could represent potential treatments of the corresponding ... ...

    Abstract SARS-CoV-2 has caused an extensive pandemic of COVID-19 all around the world. Key viral enzymes are suitable molecular targets for the development of new antivirals against SARS-CoV-2 which could represent potential treatments of the corresponding disease. With respect to its essential role in the replication of viral RNA, RNA-dependent RNA polymerase (RdRp) is one of the prime targets. HeE1-2Tyr and related derivatives were originally discovered as inhibitors of the RdRp of flaviviruses. Here, we present that these pyridobenzothiazole derivatives also significantly inhibit SARS-CoV-2 RdRp, as demonstrated using both polymerase- and cell-based antiviral assays.
    MeSH term(s) Adenosine Monophosphate/analogs & derivatives ; Adenosine Monophosphate/pharmacology ; Alanine/analogs & derivatives ; Alanine/pharmacology ; Animals ; Antiviral Agents/pharmacology ; Benzothiazoles/pharmacology ; Cell Line ; Cell Survival/drug effects ; Coronavirus RNA-Dependent RNA Polymerase/antagonists & inhibitors ; Dose-Response Relationship, Drug ; Enzyme Inhibitors/pharmacology ; Humans ; Microbial Sensitivity Tests ; Pyridones/pharmacology ; SARS-CoV-2/drug effects ; SARS-CoV-2/enzymology ; SARS-CoV-2/physiology ; Virus Replication/drug effects
    Chemical Substances Antiviral Agents ; Benzothiazoles ; Enzyme Inhibitors ; HeE1-2Tyr ; Pyridones ; remdesivir (3QKI37EEHE) ; Adenosine Monophosphate (415SHH325A) ; Coronavirus RNA-Dependent RNA Polymerase (EC 2.7.7.48) ; NSP12 protein, SARS-CoV-2 (EC 2.7.7.48) ; Alanine (OF5P57N2ZX)
    Language English
    Publishing date 2021-08-11
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2516098-9
    ISSN 1999-4915 ; 1999-4915
    ISSN (online) 1999-4915
    ISSN 1999-4915
    DOI 10.3390/v13081585
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Tacrine-Coumarin Derivatives as Topoisomerase Inhibitors with Antitumor Effects on A549 Human Lung Carcinoma Cancer Cell Lines.

    Konkoľová, Eva / Hudáčová, Monika / Hamuľaková, Slávka / Jendželovský, Rastislav / Vargová, Jana / Ševc, Juraj / Fedoročko, Peter / Kožurková, Mária

    Molecules (Basel, Switzerland)

    2021  Volume 26, Issue 4

    Abstract: A549 human lung carcinoma cell lines were treated with a series of new drugs with both tacrine and coumarin pharmacophores ( ... ...

    Abstract A549 human lung carcinoma cell lines were treated with a series of new drugs with both tacrine and coumarin pharmacophores (derivatives
    MeSH term(s) A549 Cells ; Antineoplastic Agents/chemistry ; Antineoplastic Agents/pharmacology ; Cell Proliferation/drug effects ; Coumarins/chemistry ; Coumarins/pharmacology ; DNA Topoisomerases, Type I/metabolism ; DNA Topoisomerases, Type II/metabolism ; Drug Screening Assays, Antitumor ; Humans ; Molecular Structure ; Poly-ADP-Ribose Binding Proteins/antagonists & inhibitors ; Poly-ADP-Ribose Binding Proteins/metabolism ; Tacrine/chemistry ; Tacrine/pharmacology ; Topoisomerase I Inhibitors/chemistry ; Topoisomerase I Inhibitors/pharmacology ; Topoisomerase II Inhibitors/chemistry ; Topoisomerase II Inhibitors/pharmacology ; Tumor Cells, Cultured
    Chemical Substances Antineoplastic Agents ; Coumarins ; Poly-ADP-Ribose Binding Proteins ; Topoisomerase I Inhibitors ; Topoisomerase II Inhibitors ; Tacrine (4VX7YNB537) ; DNA Topoisomerases, Type I (EC 5.99.1.2) ; TOP1 protein, human (EC 5.99.1.2) ; DNA Topoisomerases, Type II (EC 5.99.1.3) ; TOP2A protein, human (EC 5.99.1.3)
    Language English
    Publishing date 2021-02-20
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1413402-0
    ISSN 1420-3049 ; 1431-5165 ; 1420-3049
    ISSN (online) 1420-3049
    ISSN 1431-5165 ; 1420-3049
    DOI 10.3390/molecules26041133
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Guanine quadruplexes in the RNA genome of the tick-borne encephalitis virus: their role as a new antiviral target and in virus biology.

    Holoubek, Jiří / Bednářová, Klára / Haviernik, Jan / Huvarová, Ivana / Dvořáková, Zuzana / Černý, Jiří / Outlá, Martina / Salát, Jiří / Konkol'ová, Eva / Boura, Evzen / Růžek, Daniel / Vorlíčková, Michaela / Eyer, Luděk / Renčiuk, Daniel

    Nucleic acids research

    2022  Volume 50, Issue 8, Page(s) 4574–4600

    Abstract: We have identified seven putative guanine quadruplexes (G4) in the RNA genome of tick-borne encephalitis virus (TBEV), a flavivirus causing thousands of human infections and numerous deaths every year. The formation of G4s was confirmed by biophysical ... ...

    Abstract We have identified seven putative guanine quadruplexes (G4) in the RNA genome of tick-borne encephalitis virus (TBEV), a flavivirus causing thousands of human infections and numerous deaths every year. The formation of G4s was confirmed by biophysical methods on synthetic oligonucleotides derived from the predicted TBEV sequences. TBEV-5, located at the NS4b/NS5 boundary and conserved among all known flaviviruses, was tested along with its mutated variants for interactions with a panel of known G4 ligands, for the ability to affect RNA synthesis by the flaviviral RNA-dependent RNA polymerase (RdRp) and for effects on TBEV replication fitness in cells. G4-stabilizing TBEV-5 mutations strongly inhibited RdRp RNA synthesis and exhibited substantially reduced replication fitness, different plaque morphology and increased sensitivity to G4-binding ligands in cell-based systems. In contrast, strongly destabilizing TBEV-5 G4 mutations caused rapid reversion to the wild-type genotype. Our results suggest that there is a threshold of stability for G4 sequences in the TBEV genome, with any deviation resulting in either dramatic changes in viral phenotype or a rapid return to this optimal level of G4 stability. The data indicate that G4s are critical elements for efficient TBEV replication and are suitable targets to tackle TBEV infection.
    MeSH term(s) Antiviral Agents/pharmacology ; Antiviral Agents/therapeutic use ; Encephalitis Viruses, Tick-Borne/drug effects ; Encephalitis Viruses, Tick-Borne/genetics ; Encephalitis, Tick-Borne/drug therapy ; Encephalitis, Tick-Borne/genetics ; G-Quadruplexes ; Humans ; Ligands ; RNA, Viral/genetics ; RNA-Dependent RNA Polymerase/genetics
    Chemical Substances Antiviral Agents ; Ligands ; RNA, Viral ; RNA-Dependent RNA Polymerase (EC 2.7.7.48)
    Language English
    Publishing date 2022-04-22
    Publishing country England
    Document type Journal Article
    ZDB-ID 186809-3
    ISSN 1362-4962 ; 1362-4954 ; 0301-5610 ; 0305-1048
    ISSN (online) 1362-4962 ; 1362-4954
    ISSN 0301-5610 ; 0305-1048
    DOI 10.1093/nar/gkac225
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Structural analysis of the putative SARS-CoV-2 primase complex

    Konkolova, Eva / Klima, Martin / Nencka, Radim / Boura, Evzen

    Journal of Structural Biology

    2020  Volume 211, Issue 2, Page(s) 107548

    Keywords Structural Biology ; covid19
    Language English
    Publisher Elsevier BV
    Publishing country us
    Document type Article ; Online
    ZDB-ID 1032718-6
    ISSN 1095-8657 ; 1047-8477
    ISSN (online) 1095-8657
    ISSN 1047-8477
    DOI 10.1016/j.jsb.2020.107548
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article: Structural analysis of the putative SARS-CoV-2 primase complex

    Konkolova, Eva / Klima, Martin / Nencka, Radim / Boura, Evzen

    J Struct Biol

    Abstract: We report the crystal structure of the SARS-CoV-2 putative primase composed of the nsp7 and nsp8 proteins. We observed a dimer of dimers (2:2 nsp7-nsp8) in the crystallographic asymmetric unit. The structure revealed a fold with a helical core of the ... ...

    Abstract We report the crystal structure of the SARS-CoV-2 putative primase composed of the nsp7 and nsp8 proteins. We observed a dimer of dimers (2:2 nsp7-nsp8) in the crystallographic asymmetric unit. The structure revealed a fold with a helical core of the heterotetramer formed by both nsp7 and nsp8 that is flanked with two symmetry-related nsp8 ß-sheet subdomains. It was also revealed that two hydrophobic interfaces one of approx. 1340 Å2 connects the nsp7 to nsp8 and a second one of approx. 950 Å2 connects the dimers and form the observed heterotetramer. Interestingly, analysis of the surface electrostatic potential revealed a putative RNA binding site that is formed only within the heterotetramer.
    Keywords covid19
    Publisher WHO
    Document type Article
    Note WHO #Covidence: #593332
    Database COVID19

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  7. Article ; Online: Tacrine-Coumarin Derivatives as Topoisomerase Inhibitors with Antitumor Effects on A549 Human Lung Carcinoma Cancer Cell Lines

    Eva Konkoľová / Monika Hudáčová / Slávka Hamuľaková / Rastislav Jendželovský / Jana Vargová / Juraj Ševc / Peter Fedoročko / Mária Kožurková

    Molecules, Vol 26, Iss 4, p

    2021  Volume 1133

    Abstract: A549 human lung carcinoma cell lines were treated with a series of new drugs with both tacrine and coumarin pharmacophores (derivatives 1a – 2c ) in order to test the compounds’ ability to inhibit both cancer cell growth and topoisomerase I and II ... ...

    Abstract A549 human lung carcinoma cell lines were treated with a series of new drugs with both tacrine and coumarin pharmacophores (derivatives 1a – 2c ) in order to test the compounds’ ability to inhibit both cancer cell growth and topoisomerase I and II activity. The ability of human topoisomerase I ( h TOPI) and II to relax supercoiled plasmid DNA in the presence of various concentrations of the tacrine-coumarin hybrid molecules was studied with agarose gel electrophoresis. The biological activities of the derivatives were studied using MTT assays, clonogenic assays, cell cycle analysis and quantification of cell number and viability. The content and localization of the derivatives in the cells were analysed using flow cytometry and confocal microscopy. All of the studied compounds were found to have inhibited topoisomerase I activity completely. The effect of the tacrine-coumarin hybrid compounds on cancer cells is likely to be dependent on the length of the chain between the tacrine and coumarin moieties ( 1c , 1d = tacrine-(CH 2 ) 8–9 -coumarin). The most active of the tested compounds, derivatives 1c and 1d , both display longer chains.
    Keywords tacrine-coumarin derivatives ; DNA ; topoisomerases I ; II ; cytotoxicity ; lung carcinoma cells ; A549 ; Organic chemistry ; QD241-441
    Subject code 540
    Language English
    Publishing date 2021-02-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article: Drug Discovery in Low Data Regimes: Leveraging a Computational Pipeline for the Discovery of Novel SARS-CoV-2 Nsp14-MTase Inhibitors.

    Nigam, AkshatKumar / Hurley, Matthew F D / Li, Fengling / Konkoľová, Eva / Klíma, Martin / Trylčová, Jana / Pollice, Robert / Çinaroğlu, Süleyman Selim / Levin-Konigsberg, Roni / Handjaya, Jasemine / Schapira, Matthieu / Chau, Irene / Perveen, Sumera / Ng, Ho-Leung / Ümit Kaniskan, H / Han, Yulin / Singh, Sukrit / Gorgulla, Christoph / Kundaje, Anshul /
    Jin, Jian / Voelz, Vincent A / Weber, Jan / Nencka, Radim / Boura, Evzen / Vedadi, Masoud / Aspuru-Guzik, Alán

    bioRxiv : the preprint server for biology

    2024  

    Abstract: The COVID-19 pandemic, caused by the SARS-CoV-2 virus, has led to significant global morbidity and mortality. A crucial viral protein, the non-structural protein 14 (nsp14), catalyzes the methylation of viral RNA and plays a critical role in viral genome ...

    Abstract The COVID-19 pandemic, caused by the SARS-CoV-2 virus, has led to significant global morbidity and mortality. A crucial viral protein, the non-structural protein 14 (nsp14), catalyzes the methylation of viral RNA and plays a critical role in viral genome replication and transcription. Due to the low mutation rate in the nsp region among various SARS-CoV-2 variants, nsp14 has emerged as a promising therapeutic target. However, discovering potential inhibitors remains a challenge. In this work, we introduce a computational pipeline for the rapid and efficient identification of potential nsp14 inhibitors by leveraging virtual screening and the NCI open compound collection, which contains 250,000 freely available molecules for researchers worldwide. The introduced pipeline provides a cost-effective and efficient approach for early-stage drug discovery by allowing researchers to evaluate promising molecules without incurring synthesis expenses. Our pipeline successfully identified seven promising candidates after experimentally validating only 40 compounds. Notably, we discovered NSC620333, a compound that exhibits a strong binding affinity to nsp14 with a dissociation constant of 427 ± 84 nM. In addition, we gained new insights into the structure and function of this protein through molecular dynamics simulations. We identified new conformational states of the protein and determined that residues Phe367, Tyr368, and Gln354 within the binding pocket serve as stabilizing residues for novel ligand interactions. We also found that metal coordination complexes are crucial for the overall function of the binding pocket. Lastly, we present the solved crystal structure of the nsp14-MTase complexed with SS148 (PDB:8BWU), a potent inhibitor of methyltransferase activity at the nanomolar level (IC
    Language English
    Publishing date 2024-01-13
    Publishing country United States
    Document type Preprint
    DOI 10.1101/2023.10.03.560722
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Antiviral Activity of 7-Substituted 7-Deazapurine Ribonucleosides, Monophosphate Prodrugs, and Triphoshates against Emerging RNA Viruses.

    Milisavljevic, Nemanja / Konkolová, Eva / Kozák, Jaroslav / Hodek, Jan / Veselovská, Lucia / Sýkorová, Veronika / Čížek, Karel / Pohl, Radek / Eyer, Luděk / Svoboda, Pavel / Růžek, Daniel / Weber, Jan / Nencka, Radim / Bouřa, Evžen / Hocek, Michal

    ACS infectious diseases

    2021  Volume 7, Issue 2, Page(s) 471–478

    Abstract: A series of 7-deazaadenine ribonucleosides bearing alkyl, alkenyl, alkynyl, aryl, or hetaryl groups at position 7 as well as their 5'- ...

    Abstract A series of 7-deazaadenine ribonucleosides bearing alkyl, alkenyl, alkynyl, aryl, or hetaryl groups at position 7 as well as their 5'-
    MeSH term(s) Antiviral Agents/pharmacology ; COVID-19/drug therapy ; COVID-19/virology ; Cell Line, Tumor ; Dengue Virus/drug effects ; Encephalitis Viruses, Tick-Borne/drug effects ; Humans ; Phosphates/pharmacology ; Prodrugs/pharmacology ; Purine Nucleosides ; Purines/pharmacology ; RNA Viruses/drug effects ; RNA-Dependent RNA Polymerase/metabolism ; Ribonucleosides/pharmacology ; SARS-CoV-2/drug effects ; West Nile virus/drug effects ; Zika Virus/drug effects
    Chemical Substances 7-deazapurine ; Antiviral Agents ; Phosphates ; Prodrugs ; Purine Nucleosides ; Purines ; Ribonucleosides ; RNA-Dependent RNA Polymerase (EC 2.7.7.48)
    Language English
    Publishing date 2021-01-04
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 2373-8227
    ISSN (online) 2373-8227
    DOI 10.1021/acsinfecdis.0c00829
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Remdesivir triphosphate can efficiently inhibit the RNA-dependent RNA polymerase from various flaviviruses.

    Konkolova, Eva / Dejmek, Milan / Hřebabecký, Hubert / Šála, Michal / Böserle, Jiří / Nencka, Radim / Boura, Evzen

    Antiviral research

    2020  Volume 182, Page(s) 104899

    Abstract: Remdesivir was shown to inhibit RNA-dependent RNA-polymerases (RdRp) from distinct viral families such as from Filoviridae (Ebola) and Coronaviridae (SARS-CoV, SARS-CoV-2, MERS). In this study, we tested the ability of remdesivir to inhibit RdRps from ... ...

    Abstract Remdesivir was shown to inhibit RNA-dependent RNA-polymerases (RdRp) from distinct viral families such as from Filoviridae (Ebola) and Coronaviridae (SARS-CoV, SARS-CoV-2, MERS). In this study, we tested the ability of remdesivir to inhibit RdRps from the Flaviviridae family. Instead of remdesivir, we used the active species that is produced in cells from remdesivir, the appropriate triphosphate, which could be directly tested in vitro using recombinant flaviviral polymerases. Our results show that remdesivir can efficiently inhibit RdRps from viruses causing severe illnesses such as Yellow fever, West Nile fever, Japanese and Tick-borne encephalitis, Zika and Dengue. Taken together, this study demonstrates that remdesivir or its derivatives have the potential to become a broad-spectrum antiviral agent effective against many RNA viruses.
    MeSH term(s) Adenosine Triphosphate/analogs & derivatives ; Adenosine Triphosphate/chemistry ; Adenosine Triphosphate/pharmacology ; Antiviral Agents/chemistry ; Antiviral Agents/pharmacology ; Betacoronavirus/drug effects ; Betacoronavirus/enzymology ; COVID-19 ; Coronavirus Infections/drug therapy ; Coronavirus Infections/virology ; Flavivirus/drug effects ; Flavivirus/enzymology ; Humans ; Inhibitory Concentration 50 ; Pandemics ; Pneumonia, Viral/drug therapy ; Pneumonia, Viral/virology ; RNA Viruses/drug effects ; RNA Viruses/enzymology ; RNA-Dependent RNA Polymerase/antagonists & inhibitors ; RNA-Dependent RNA Polymerase/metabolism ; SARS-CoV-2
    Chemical Substances Antiviral Agents ; Adenosine Triphosphate (8L70Q75FXE) ; GS-441524 triphosphate (AEL0YED4SU) ; RNA-Dependent RNA Polymerase (EC 2.7.7.48)
    Keywords covid19
    Language English
    Publishing date 2020-08-05
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 306628-9
    ISSN 1872-9096 ; 0166-3542
    ISSN (online) 1872-9096
    ISSN 0166-3542
    DOI 10.1016/j.antiviral.2020.104899
    Database MEDical Literature Analysis and Retrieval System OnLINE

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