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  1. Article ; Online: Exploring new antiviral targets for influenza and COVID-19: Mapping promising hot spots in viral RNA polymerases.

    Figueiredo-Nunes, Inês / Trigueiro-Louro, João / Rebelo-de-Andrade, Helena

    Virology

    2022  Volume 578, Page(s) 45–60

    Abstract: Influenza and COVID-19 are infectious respiratory diseases that represent a major concern to public health with social and economic impact worldwide, for which the available therapeutic options are not satisfactory. The RdRp has a central role in viral ... ...

    Abstract Influenza and COVID-19 are infectious respiratory diseases that represent a major concern to public health with social and economic impact worldwide, for which the available therapeutic options are not satisfactory. The RdRp has a central role in viral replication and thus represents a major target for the development of antiviral approaches. In this study, we focused on Influenza A virus PB1 polymerase protein and the betacoronaviruses nsp12 polymerase protein, considering their functional and structural similarities. We have performed conservation and druggability analysis to map conserved druggable regions, that may have functional or structural importance in these proteins. We disclosed the most promising and new targeting regions for the discovery of new potential polymerase inhibitors. Conserved druggable regions of putative interaction with favipiravir and molnupiravir were also mapped. We have also compared and integrated the current findings with previous research.
    MeSH term(s) Humans ; Antiviral Agents/chemistry ; COVID-19 ; Viral Replicase Complex Proteins ; Influenza, Human/drug therapy ; RNA-Dependent RNA Polymerase/metabolism ; RNA, Viral/genetics
    Chemical Substances Antiviral Agents ; Viral Replicase Complex Proteins ; RNA-Dependent RNA Polymerase (EC 2.7.7.48) ; RNA, Viral
    Language English
    Publishing date 2022-11-18
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 200425-2
    ISSN 1096-0341 ; 0042-6822
    ISSN (online) 1096-0341
    ISSN 0042-6822
    DOI 10.1016/j.virol.2022.11.001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Adaptive evolution of PB1 from influenza A(H1N1)pdm09 virus towards an enhanced fitness.

    Santos, Luís A / Almeida, Filipe / Gíria, Marta / Trigueiro-Louro, João / Rebelo-de-Andrade, Helena

    Virology

    2022  Volume 578, Page(s) 1–6

    Abstract: PB1 influenza virus retain traces of interspecies transmission and adaptation. Previous phylogenetic analyses highlighted mutations L298I, R386K and I517V in PB1 to have putatively ameliorated the A(H1N1)pdm09 adaptation to the human host. This study ... ...

    Abstract PB1 influenza virus retain traces of interspecies transmission and adaptation. Previous phylogenetic analyses highlighted mutations L298I, R386K and I517V in PB1 to have putatively ameliorated the A(H1N1)pdm09 adaptation to the human host. This study aimed to evaluate the reversal of these mutations and infer the role of these residues in the virus overall fitness and adaptation. We generate PB1-mutated viruses introducing I298L, K386R and V517I mutations in PB1 and evaluate their phenotypic impact on viral growth and on antigen yield. We observed a decrease in viral growth accompanied by a reduction in hemagglutination titer and neuraminidase activity, in comparison with wt. Our data indicate that the adaptive evolution occurred in the PB1 leads to an improved overall viral fitness; and such biologic advantaged has the potential to be applied to the optimization of influenza vaccine seed prototypes.
    MeSH term(s) Humans ; Influenza A Virus, H1N1 Subtype/genetics ; Influenza, Human ; Phylogeny ; Viral Proteins/genetics ; Influenza A virus/genetics ; Influenza Vaccines/genetics
    Chemical Substances Viral Proteins ; Influenza Vaccines
    Language English
    Publishing date 2022-11-17
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 200425-2
    ISSN 1096-0341 ; 0042-6822
    ISSN (online) 1096-0341
    ISSN 0042-6822
    DOI 10.1016/j.virol.2022.11.003
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Optimization of A(H1N1)pdm09 vaccine seed viruses: The source of PB1 and HA vRNA as a major determinant for antigen yield.

    Almeida, Filipe / Santos, Luís A / Trigueiro-Louro, João M / Rebelo-de-Andrade, Helena

    Virus research

    2022  Volume 315, Page(s) 198795

    Abstract: Vaccination prevents and reduces the severity of influenza virus infections. Continuous evolution of influenza hemagglutinin (HA) and neuraminidase (NA) supports the virus to evade pre-existing immunity, which demands vaccines to be reformulated every ... ...

    Abstract Vaccination prevents and reduces the severity of influenza virus infections. Continuous evolution of influenza hemagglutinin (HA) and neuraminidase (NA) supports the virus to evade pre-existing immunity, which demands vaccines to be reformulated every year. Incorporation of polymerase basic protein 1 (PB1) viral RNA (vRNA) of the same origin of HA and NA vRNA has been observed in previous pandemic viruses and occasionally reported for influenza A vaccine prototype strains of prior seasons. At this point, it remains to be explored whether this phenomenon translates into an improved growth phenotype. In this work, we showed that the HA vRNA of A(H1N1)pdm09 is generally incorporated with the PB1 vRNA of the same origin, establishing the beneficial effect of the presence of PB1 and the pattern of the PB1-HA co-incorporation in the A(H1N1)pdm09 model. We further investigated the putative interplay between PB1 and antigenic proteins regarding the vRNA composition of the progeny and observed that vRNA segregation does not appear to be mainly determined by protein-protein interactions; while vRNA-vRNA interactions can be suggested as the main driving force. Our data also indicate an increase in the hemagglutination capacity and neuraminidase activity due to incorporation of PB1, HA and NA from A(H1N1)pdm09, in comparison with the recombinant virus incorporating only HA and NA from A(H1N1)pdm09 - which have the potential to improve current limitations regarding antigenicity and immunogenicity of influenza vaccines. Further knowledge of the complex vRNA-vRNA interaction network between PB1 and HA will additionally contribute to improve current vaccine formulation, and to gradually optimize the production of A(H1N1)pdm09 reverse genetics vaccine seed virus towards a higher cost-effectiveness.
    MeSH term(s) Hemagglutinin Glycoproteins, Influenza Virus/genetics ; Hemagglutinins ; Humans ; Influenza A Virus, H1N1 Subtype/genetics ; Influenza Vaccines/genetics ; Influenza, Human ; Neuraminidase/genetics ; RNA, Viral/genetics ; Viral Proteins/metabolism
    Chemical Substances Hemagglutinin Glycoproteins, Influenza Virus ; Hemagglutinins ; Influenza Vaccines ; RNA, Viral ; Viral Proteins ; Neuraminidase (EC 3.2.1.18)
    Language English
    Publishing date 2022-04-30
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 605780-9
    ISSN 1872-7492 ; 0168-1702
    ISSN (online) 1872-7492
    ISSN 0168-1702
    DOI 10.1016/j.virusres.2022.198795
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: COVID-19: impact on Public Health and hypothesis-driven investigations on genetic susceptibility and severity.

    David, Susana / Dorado, Guillermo / Duarte, Elsa L / David-Bosne, Stephanie / Trigueiro-Louro, João / Rebelo-de-Andrade, Helena

    Immunogenetics

    2022  Volume 74, Issue 4, Page(s) 381–407

    Abstract: COVID-19 is a new complex multisystem disease caused by the novel coronavirus SARS-CoV-2. In slightly over 2 years, it infected nearly 500 million and killed 6 million human beings worldwide, causing an unprecedented coronavirus pandemic. Currently, the ... ...

    Abstract COVID-19 is a new complex multisystem disease caused by the novel coronavirus SARS-CoV-2. In slightly over 2 years, it infected nearly 500 million and killed 6 million human beings worldwide, causing an unprecedented coronavirus pandemic. Currently, the international scientific community is engaged in elucidating the molecular mechanisms of the pathophysiology of SARS-CoV-2 infection as a basis of scientific developments for the future control of COVID-19. Global exome and genome analysis efforts work to define the human genetics of protective immunity to SARS-CoV-2 infection. Here, we review the current knowledge regarding the SARS-CoV-2 infection, the implications of COVID-19 to Public Health and discuss genotype to phenotype association approaches that could be exploited through the selection of candidate genes to identify the genetic determinants of severe COVID-19.
    MeSH term(s) COVID-19/genetics ; Genetic Predisposition to Disease ; Humans ; Pandemics ; Public Health ; SARS-CoV-2
    Language English
    Publishing date 2022-03-29
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 186560-2
    ISSN 1432-1211 ; 0093-7711
    ISSN (online) 1432-1211
    ISSN 0093-7711
    DOI 10.1007/s00251-022-01261-w
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Optimization of A(H1N1)pdm09 vaccine seed viruses: The source of PB1 and HA vRNA as a major determinant for antigen yield

    Almeida, Filipe / Santos, Luís A. / Trigueiro-Louro, João M. / Rebelo-de-Andrade, Helena

    Virus research. 2022 July 02, v. 315

    2022  

    Abstract: Vaccination prevents and reduces the severity of influenza virus infections. Continuous evolution of influenza hemagglutinin (HA) and neuraminidase (NA) supports the virus to evade pre-existing immunity, which demands vaccines to be reformulated every ... ...

    Abstract Vaccination prevents and reduces the severity of influenza virus infections. Continuous evolution of influenza hemagglutinin (HA) and neuraminidase (NA) supports the virus to evade pre-existing immunity, which demands vaccines to be reformulated every year. Incorporation of polymerase basic protein 1 (PB1) viral RNA (vRNA) of the same origin of HA and NA vRNA has been observed in previous pandemic viruses and occasionally reported for influenza A vaccine prototype strains of prior seasons. At this point, it remains to be explored whether this phenomenon translates into an improved growth phenotype. In this work, we showed that the HA vRNA of A(H1N1)pdm09 is generally incorporated with the PB1 vRNA of the same origin, establishing the beneficial effect of the presence of PB1 and the pattern of the PB1-HA co-incorporation in the A(H1N1)pdm09 model. We further investigated the putative interplay between PB1 and antigenic proteins regarding the vRNA composition of the progeny and observed that vRNA segregation does not appear to be mainly determined by protein-protein interactions; while vRNA-vRNA interactions can be suggested as the main driving force. Our data also indicate an increase in the hemagglutination capacity and neuraminidase activity due to incorporation of PB1, HA and NA from A(H1N1)pdm09, in comparison with the recombinant virus incorporating only HA and NA from A(H1N1)pdm09 – which have the potential to improve current limitations regarding antigenicity and immunogenicity of influenza vaccines. Further knowledge of the complex vRNA-vRNA interaction network between PB1 and HA will additionally contribute to improve current vaccine formulation, and to gradually optimize the production of A(H1N1)pdm09 reverse genetics vaccine seed virus towards a higher cost-effectiveness.
    Keywords Orthomyxoviridae ; RNA ; antigens ; cost effectiveness ; hemagglutination ; hemagglutinins ; immunogenicity ; influenza ; models ; pandemic ; phenotype ; progeny ; prototypes ; reverse genetics ; sialidase ; vaccination ; viruses
    Language English
    Dates of publication 2022-0702
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 605780-9
    ISSN 1872-7492 ; 0168-1702
    ISSN (online) 1872-7492
    ISSN 0168-1702
    DOI 10.1016/j.virusres.2022.198795
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: NS1 protein as a novel anti-influenza target: Map-and-mutate antiviral rationale reveals new putative druggable hot spots with an important role on viral replication

    Trigueiro-Louro, João / Santos, Luís A. / Almeida, Filipe / Correia, Vanessa / Brito, Rui M.M. / Rebelo-de-Andrade, Helena

    Virology. 2022 Jan. 02, v. 565

    2022  

    Abstract: Influenza NS1 is a promising anti-influenza target, considering its conserved and druggable structure, and key function in influenza replication and pathogenesis. Notwithstanding, target identification and validation, strengthened by experimental data, ... ...

    Abstract Influenza NS1 is a promising anti-influenza target, considering its conserved and druggable structure, and key function in influenza replication and pathogenesis. Notwithstanding, target identification and validation, strengthened by experimental data, are lacking.Here, we further explored our previously designed structure-based antiviral rationale directed to highly conserved druggable NS1 regions across a broad spectrum of influenza A viruses. We aimed to identify NS1-mutated viruses exhibiting a reduced growth phenotype and/or an altered cell apoptosis profile.We found that NS1 mutations Y171A, K175A (consensus druggable pocket 1), W102A (consensus druggable pocket 3), Q121A and G184P (multiple consensus druggable pockets) – located at hot spots amenable for pharmacological modulation - significantly impaired A(H1N1)pdm09 virus replication, in vitro. This is the first time that NS1–K175A, -W102A, and -Q121A mutations are characterized. Our map-and-mutate strategy provides the basis to establish the NS1 as a promising target using a rationale with a higher resilience to resistance development.
    Keywords apoptosis ; influenza ; pathogenesis ; phenotype ; virus replication
    Language English
    Dates of publication 2022-0102
    Size p. 106-116.
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 200425-2
    ISSN 1096-0341 ; 0042-6822
    ISSN (online) 1096-0341
    ISSN 0042-6822
    DOI 10.1016/j.virol.2021.11.001
    Database NAL-Catalogue (AGRICOLA)

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  7. Article: Unlocking COVID therapeutic targets: A structure-based rationale against SARS-CoV-2, SARS-CoV and MERS-CoV Spike.

    Trigueiro-Louro, João / Correia, Vanessa / Figueiredo-Nunes, Inês / Gíria, Marta / Rebelo-de-Andrade, Helena

    Computational and structural biotechnology journal

    2020  Volume 18, Page(s) 2117–2131

    Abstract: There are no approved target therapeutics against SARS-CoV-2 or other beta-CoVs. The beta-CoV Spike protein is a promising target considering the critical role in viral infection and pathogenesis and its surface exposed features. We performed a structure- ...

    Abstract There are no approved target therapeutics against SARS-CoV-2 or other beta-CoVs. The beta-CoV Spike protein is a promising target considering the critical role in viral infection and pathogenesis and its surface exposed features. We performed a structure-based strategy targeting highly conserved druggable regions resulting from a comprehensive large-scale sequence analysis and structural characterization of Spike domains across SARSr- and MERSr-CoVs. We have disclosed 28 main consensus druggable pockets within the Spike. The RBD and SD1 (S1 subunit); and the CR, HR1 and CH (S2 subunit) represent the most promising conserved druggable regions. Additionally, we have identified 181 new potential hot spot residues for the hSARSr-CoVs and 72 new hot spot residues for the SARSr- and MERSr-CoVs, which have not been described before in the literature. These sites/residues exhibit advantageous structural features for targeted molecular and pharmacological modulation. This study establishes the Spike as a promising anti-CoV target using an approach with a potential higher resilience to resistance development and directed to a broad spectrum of Beta-CoVs, including the new SARS-CoV-2 responsible for COVID-19. This research also provides a structure-based rationale for the design and discovery of chemical inhibitors, antibodies or other therapeutic modalities successfully targeting the Beta-CoV Spike protein.
    Keywords covid19
    Language English
    Publishing date 2020-07-31
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2694435-2
    ISSN 2001-0370
    ISSN 2001-0370
    DOI 10.1016/j.csbj.2020.07.017
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: NS1 protein as a novel anti-influenza target: Map-and-mutate antiviral rationale reveals new putative druggable hot spots with an important role on viral replication.

    Trigueiro-Louro, João / Santos, Luís A / Almeida, Filipe / Correia, Vanessa / Brito, Rui M M / Rebelo-de-Andrade, Helena

    Virology

    2021  Volume 565, Page(s) 106–116

    Abstract: Influenza NS1 is a promising anti-influenza target, considering its conserved and druggable structure, and key function in influenza replication and pathogenesis. Notwithstanding, target identification and validation, strengthened by experimental data, ... ...

    Abstract Influenza NS1 is a promising anti-influenza target, considering its conserved and druggable structure, and key function in influenza replication and pathogenesis. Notwithstanding, target identification and validation, strengthened by experimental data, are lacking. Here, we further explored our previously designed structure-based antiviral rationale directed to highly conserved druggable NS1 regions across a broad spectrum of influenza A viruses. We aimed to identify NS1-mutated viruses exhibiting a reduced growth phenotype and/or an altered cell apoptosis profile. We found that NS1 mutations Y171A, K175A (consensus druggable pocket 1), W102A (consensus druggable pocket 3), Q121A and G184P (multiple consensus druggable pockets) - located at hot spots amenable for pharmacological modulation - significantly impaired A(H1N1)pdm09 virus replication, in vitro. This is the first time that NS1-K175A, -W102A, and -Q121A mutations are characterized. Our map-and-mutate strategy provides the basis to establish the NS1 as a promising target using a rationale with a higher resilience to resistance development.
    MeSH term(s) Amino Acid Substitution ; Animals ; Apoptosis ; Cell Line ; Dogs ; Drug Discovery ; HEK293 Cells ; Host Microbial Interactions ; Humans ; Influenza A virus/genetics ; Influenza A virus/pathogenicity ; Influenza, Human/metabolism ; Influenza, Human/virology ; Madin Darby Canine Kidney Cells ; Mutation ; Orthomyxoviridae Infections/metabolism ; Orthomyxoviridae Infections/virology ; Viral Nonstructural Proteins/genetics ; Virus Replication
    Chemical Substances INS1 protein, influenza virus ; Viral Nonstructural Proteins
    Language English
    Publishing date 2021-11-06
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 200425-2
    ISSN 1096-0341 ; 0042-6822
    ISSN (online) 1096-0341
    ISSN 0042-6822
    DOI 10.1016/j.virol.2021.11.001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Unlocking COVID therapeutic targets: A structure-based rationale against SARS-CoV-2, SARS-CoV and MERS-CoV Spike

    Trigueiro-Louro, João / Correia, Vanessa / Figueiredo-Nunes, Inês / Gíria, Marta / Rebelo-de-Andrade, Helena

    Computational and Structural Biotechnology Journal. 2020, v. 18

    2020  

    Abstract: There are no approved target therapeutics against SARS-CoV-2 or other beta-CoVs. The beta-CoV Spike protein is a promising target considering the critical role in viral infection and pathogenesis and its surface exposed features. We performed a structure- ...

    Abstract There are no approved target therapeutics against SARS-CoV-2 or other beta-CoVs. The beta-CoV Spike protein is a promising target considering the critical role in viral infection and pathogenesis and its surface exposed features. We performed a structure-based strategy targeting highly conserved druggable regions resulting from a comprehensive large-scale sequence analysis and structural characterization of Spike domains across SARSr- and MERSr-CoVs. We have disclosed 28 main consensus druggable pockets within the Spike. The RBD and SD1 (S1 subunit); and the CR, HR1 and CH (S2 subunit) represent the most promising conserved druggable regions. Additionally, we have identified 181 new potential hot spot residues for the hSARSr-CoVs and 72 new hot spot residues for the SARSr- and MERSr-CoVs, which have not been described before in the literature. These sites/residues exhibit advantageous structural features for targeted molecular and pharmacological modulation. This study establishes the Spike as a promising anti-CoV target using an approach with a potential higher resilience to resistance development and directed to a broad spectrum of Beta-CoVs, including the new SARS-CoV-2 responsible for COVID-19. This research also provides a structure-based rationale for the design and discovery of chemical inhibitors, antibodies or other therapeutic modalities successfully targeting the Beta-CoV Spike protein.
    Keywords COVID-19 infection ; Severe acute respiratory syndrome coronavirus 2 ; biotechnology ; pathogenesis ; sequence analysis ; therapeutics
    Language English
    Size p. 2117-2131.
    Publishing place Elsevier B.V.
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 2694435-2
    ISSN 2001-0370
    ISSN 2001-0370
    DOI 10.1016/j.csbj.2020.07.017
    Database NAL-Catalogue (AGRICOLA)

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  10. Article ; Online: Unlocking COVID therapeutic targets

    João Trigueiro-Louro / Vanessa Correia / Inês Figueiredo-Nunes / Marta Gíria / Helena Rebelo-de-Andrade

    Computational and Structural Biotechnology Journal, Vol 18, Iss , Pp 2117-

    A structure-based rationale against SARS-CoV-2, SARS-CoV and MERS-CoV Spike

    2020  Volume 2131

    Abstract: There are no approved target therapeutics against SARS-CoV-2 or other beta-CoVs. The beta-CoV Spike protein is a promising target considering the critical role in viral infection and pathogenesis and its surface exposed features. We performed a structure- ...

    Abstract There are no approved target therapeutics against SARS-CoV-2 or other beta-CoVs. The beta-CoV Spike protein is a promising target considering the critical role in viral infection and pathogenesis and its surface exposed features. We performed a structure-based strategy targeting highly conserved druggable regions resulting from a comprehensive large-scale sequence analysis and structural characterization of Spike domains across SARSr- and MERSr-CoVs. We have disclosed 28 main consensus druggable pockets within the Spike. The RBD and SD1 (S1 subunit); and the CR, HR1 and CH (S2 subunit) represent the most promising conserved druggable regions. Additionally, we have identified 181 new potential hot spot residues for the hSARSr-CoVs and 72 new hot spot residues for the SARSr- and MERSr-CoVs, which have not been described before in the literature. These sites/residues exhibit advantageous structural features for targeted molecular and pharmacological modulation. This study establishes the Spike as a promising anti-CoV target using an approach with a potential higher resilience to resistance development and directed to a broad spectrum of Beta-CoVs, including the new SARS-CoV-2 responsible for COVID-19. This research also provides a structure-based rationale for the design and discovery of chemical inhibitors, antibodies or other therapeutic modalities successfully targeting the Beta-CoV Spike protein.
    Keywords Betacoronavirus ; Coronavirus disease ; Druggability prediction ; Novel antiviral targets ; SARS-CoV-2 ; Sequence conservation ; Biotechnology ; TP248.13-248.65 ; covid19
    Subject code 572
    Language English
    Publishing date 2020-01-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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