English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/177171
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Approved drugs screening against the nsP1 capping enzyme of Venezuelan equine encephalitis virus using an immuno-based assay

AuthorsFerreira-Ramos, A. S.; Li, C.; Eydoux, C.; Contreras, J. M.; Morice, C.; Quérat, G.; Gigante, A.; Peréz-Pérez, María-Jesús ; Jung, M. L.; Canard, B.; Guillemot, J. C.; Decroly, E.; Coutard, B.
HT screening
Approved drugs
mRNA capping
Issue Date2019
CitationAntiviral Research 163: 59-69 (2019)
AbstractAlphaviruses such as the Venezuelan equine encephalitis virus (VEEV) are important human emerging pathogens transmitted by mosquitoes. They possess a unique viral mRNA capping mechanism catalyzed by the viral non-structural protein nsP1, which is essential for virus replication. The alphaviruses capping starts by the methylation of a GTP molecule by the N7-guanine methyltransferase (MTase) activity; nsP1 then forms a covalent link with mGMP releasing pyrophosphate (GT reaction) and the mGMP is next transferred onto the 5′-diphosphate end of the viral mRNA to form a cap-0 structure. The cap-0 structure decreases the detection of foreign viral RNAs, prevents RNA degradation by cellular exonucleases, and promotes viral RNA translation into proteins. Additionally, reverse-genetic studies have demonstrated that viruses mutated in nsP1 catalytic residues are both impaired towards replication and attenuated. The nsP1 protein is thus considered an attractive antiviral target for drug discovery. We have previously demonstrated that the guanylylation of VEEV nsP1 can be monitored by Western blot analysis using an antibody recognizing the cap structure. In this study, we developed a high throughput ELISA screening assay to monitor the GT reaction through mGMP-nsP1 adduct quantitation. This assay was validated using known nsP1 inhibitors before screening 1220 approved compounds. 18 compounds inhibiting the nsP1 guanylylation were identified, and their IC determined. Compounds from two series were further characterized and shown to inhibit the nsP1 MTase activity. Conversely, these compounds barely inhibited a cellular MTase demonstrating their specificity towards nsP1. Analogues search and SAR were also initiated to identify the active pharmacophore features. Altogether the results show that this HT enzyme-based assay is a convenient way to select potent and specific hit compounds targeting the viral mRNA capping of Alphaviruses.
Publisher version (URL)http://dx.doi.org/10.1016/j.antiviral.2019.01.003
Identifiersdoi: 10.1016/j.antiviral.2019.01.003
issn: 0166-3542
e-issn: 1872-9096
Appears in Collections:(IQM) Artículos
Files in This Item:
File Description SizeFormat 
accesoRestringido.pdf15,38 kBAdobe PDFThumbnail
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.