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  Abstract View: 93

Original Article

Investigation of plant flavonoids as potential dengue protease inhibitors

Mangala K Jayadevappa 1, 2 ORCID logo, Pooja R Karkera 2, 3 ORCID logo, Ravikumar Y Siddappa 2* ORCID logo, Sandeep Telkar 4 ORCID logo, Prashantha Karunakara 5 ORCID logo

1 Department of Biotechnology, Bharathiar University, Coimbatore, Tamil Nadu-641046, India
2 Department of Biotechnology, M. S. Ramaiah Institute of Technology, Bengaluru-560 054, Karnataka, India
3 Department of Biochemistry, REVA University, Bengaluru 560064, Karnataka, India
4 Department of Biotechnology, Jnanasayadri, Kuvempu University, Shankaraghatta-577129, Shivamogga Dst., Karnataka, India
5 Department of Biotechnology, PES University, Bengaluru 560085, Karnataka, India

Abstract

Introduction: Dengue infection is one of the worldwide problems with an increasing rate. Dengue virus (DENV) belonging to Flaviviridae family carries a positive single strand RNA, consists of four serotypes, gives rise to dengue shock syndrome, undifferentiated fever (DF), and dengue hemorrhagic fever. Unfortunately, there is no licensed drug available for various serotypes and the vaccine candidates are still under investigation. Flavonoids are a group of important phytochemicals of many plants used against various viruses. Therefore, the present study was designed to screen the subset of plant flavonoids against the DENV NS2/NS3 protease of 3L6P and 2VBC of serotype 1 and serotype 4 respectively by in silico docking.Methods: Flavonoids were subjected to docking study using AutoDock Vina. The lead molecule was further investigated for its dengue viral protease inhibition. Further the cytotoxicity of lead molecule was tested by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. Absorption, distribution, metabolism, excretion and toxicity (ADMET) study was performed using OSIRIS software.Results: The flavonoids amentoflavone, quercetin-3-O-β-D-glucopyranoside, avicularin, reynoutrin, silymarin and scutallarein showed potential interactions in both serotype 1 and serotype 4 and hence these flavonoids can be served as potential lead candidates to stop viral replication. Amentoflavone, the lead molecule, showed potential in-vitro protease inhibition activity and also the concentration was below the minimal effective level for the in-vitro cytotoxicity test conducted.Conclusion: This finding has laid the groundwork for eventual identification of these flavonoids in developing potential inhibitor candidates for further development by in-vitro extraction and chemical modification methods.
Keywords: Flavonoids, NS2/NS3 protease, Dengue virus, Protease inhibitors, Molecular docking

Implication for health policy/practice/research/medical education: Amentoflavone, the lead molecule, could be a potential inhibitor of dengue viral NS2B/NS3 protease enzyme. Further investigation may lead to develop amentoflavone as drug candidate to treat dengue infection.

Please cite this paper as: Jayadevappa MK, Karkera PR, Siddappa RY, Telkar S, Karunakara P. Investigation of plant flavonoids as potential dengue protease inhibitors. J Herbmed Pharmacol. 2020;9(4):366-373. doi: 10.34172/jhp.2020.46.

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Submitted: 12 Nov 2019
Revision: 08 Mar 2020
Accepted: 10 Mar 2020
ePublished: 01 Jul 2020
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