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Updated: Jun 12, 2026
Zika Virus Specific Diagnostic Epitope Discovery
Published on: December 12, 2017
Identification of Novel Non-Nucleoside Inhibitors of Zika Virus NS5 Protein Targeting MTase Activity
Diego Fiorucci1, Micaela Meaccini1, Giulio Poli1
1Department of Biotechnology, Chemistry and Pharmacy, University of Siena, via Aldo Moro 2, 53100 Siena, Italy.
Abstract:
Zika virus (ZIKV) is a positive-sense single-stranded virus member of the Flaviviridae family. Among other arboviruses, ZIKV can cause neurological disorders such as Guillain Barré syndrome, and it can have congenital neurological manifestations and affect fertility. ZIKV nonstructural protein 5 (NS5) is essential for viral replication and limiting host immune detection. Herein, we performed virtual screening to identify novel small-molecule inhibitors of the ZIKV NS5 methyltransferase (MTase) domain. Compounds were tested against the MTases of both ZIKV and DENV, demonstrating good inhibitory activities against ZIKV MTase. Extensive molecular dynamic studies conducted on the series led us to identify other derivatives with improved activity against the MTase and limiting ZIKV infection with an increased selectivity index. Preliminary pharmacokinetic parameters have been determined, revealing excellent stability over time. Preliminary in vivo toxicity studies demonstrated that the hit compound 17 is well tolerated after acute administration. Our results provide the basis for further optimization studies on novel non-nucleoside MTase inhibitors.
Insights
Researchers identified novel small-molecule inhibitors targeting Zika virus (ZIKV) nonstructural protein 5 methyltransferase (NS5 MTase). These compounds show promise in limiting ZIKV infection and warrant further development as potential antiviral therapies.
Area of Science:
- Virology
- Drug Discovery
- Structural Biology
Background:
- Zika virus (ZIKV), a Flaviviridae family member, causes neurological disorders and affects fertility.
- ZIKV nonstructural protein 5 (NS5) is crucial for viral replication and immune evasion.
Purpose of the Study:
- To identify novel small-molecule inhibitors targeting the ZIKV NS5 methyltransferase (MTase) domain.
- To evaluate the efficacy and selectivity of identified compounds against ZIKV and Dengue virus (DENV) MTases.
Main Methods:
- Virtual screening was employed to identify potential small-molecule inhibitors.
- In vitro assays tested compound activity against ZIKV and DENV MTases.
- Molecular dynamics studies were performed to analyze compound-protein interactions.
- Preliminary pharmacokinetic and in vivo toxicity studies were conducted.
Main Results:
- Several compounds demonstrated good inhibitory activity against ZIKV MTase.
- Molecular dynamics identified derivatives with enhanced activity and selectivity.
- Hit compound 17 showed good tolerability in preliminary in vivo toxicity studies.
- Compounds exhibited excellent stability in preliminary pharmacokinetic assessments.
Conclusions:
- Novel non-nucleoside inhibitors of ZIKV NS5 MTase were identified.
- The identified compounds show potential for ZIKV infection treatment.
- Further optimization studies are supported by these findings.
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