Abstract
Introduction: The novel coronavirus disease (COVID-19) is a viral disease caused by severe
acute respiratory syndrome coronavirus 2 (SAR-CoV-2). The development of antiviral drugs has enhaced
treatment of COVID-19. SARS-CoV-2 main protease (Mpro) is a key enzyme responsible for viral replication
and transcription. This study aimed to identify new natural structures for the design of SARS-CoV-2
Mpro inhibitors.
Methods: In this present work, The CDOCKER protocol and scoring functions were validated. The validated
docking-based virtual screening approach was then employed to search the in-house database of
natural compounds for potential lead compounds as SARS-CoV-2 Mpro inhibitors. The top 3 compounds
were further biologically evaluated in vitro.
Results and Discussion: Docking studies of the known ligand GC-376 led to results consistent with cocrystallized
data (PDB ID: 7D1M). Additionally, the effectiveness of docking scoring functions was validated
by using the training set consisting of 15 active compounds and 15 inactive compounds. Then, the
in-house database of natural compounds (overall 34,439 natural compounds) was subjected to dockingbased
virtual screening resulting in the identification of the top 100 compounds having relatively better
docking scores. Among them, the highest ranking 3 compounds (W-1, W-2, and W-3) were biologically
evaluated in vitro for their inhibitory activity against SARS-CoV-2 Mpro, and compound W-1 was identified
as the most potent SARS-CoV-2 Mpro inhibitor with an IC50 value of 63 ± 3 μM. Interestingly, it appeared
that the in vitro activities of compounds W-1, W-2, and W-3 were in agreement with their molecular
modeling data.
Conclusion: Our results provided a useful reference for the discovery of novel natural SARS-CoV-2 Mpro
inhibitors by virtual screening.
[23]
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Sci. Rep., 2021,
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[
http://dx.doi.org/10.1038/s41598-021-94951-6] [PMID:
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Qiao, J.; Li, Y.S.; Zeng, R.; Liu, F.L.; Luo, R.H.; Huang, C.; Wang, Y.F.; Zhang, J.; Quan, B.; Shen, C.; Mao, X.; Liu, X.; Sun, W.; Yang, W.; Ni, X.; Wang, K.; Xu, L.; Duan, Z.L.; Zou, Q.C.; Zhang, H.L.; Qu, W.; Long, Y.H.P.; Li, M.H.; Yang, R.C.; Liu, X.; You, J.; Zhou, Y.; Yao, R.; Li, W.P.; Liu, J.M.; Chen, P.; Liu, Y.; Lin, G.F.; Yang, X.; Zou, J.; Li, L.; Hu, Y.; Lu, G.W.; Li, W.M.; Wei, Y.Q.; Zheng, Y.T.; Lei, J.; Yang, S. SARS-CoV-2 M pro inhibitors with antiviral activity in a transgenic mouse model.
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[
http://dx.doi.org/10.1126/science.abf1611] [PMID:
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