Molecular docking, molecular dynamic and drug-likeness studies of natural flavonoids as inhibitors for SARS-CoV-2 main protease (Mpro)
Listiana Oktavia, Praptiwi Praptiwi, Andria Agusta · Journal of Research in Pharmacy · 2021
The emergence of the global pandemic COVID-19 lead to a huge demand for the therapeutic agent to combat the disease.Since the FDA approval of some of HIV-1 main protease inhibitors such as ritonavir lopinavir to treat COVID-19, the investigation of anti-HIV inhibitor to inhibit SARS-CoV-2 main protease (M pro ) is getting considerably much attention.This study evaluates the potency of sixteen selected natural flavonoids which were previously reported active to block HIV-1 protease as potential inhibitors of SARS-CoV-2 M pro .The molecular docking and dynamic study were completed to know the binding affinity and stability of the protein-ligand complex via docking study along with molecular dynamic simulations.Moreover, drug-likeness was also evaluated through via ADMET evaluation.This study revealed robinin (6), a flavonol molecule with linked to galactose-rhamnose at C3 and rhamnose molecule at C7, exhibited the highest binding affinity (-9 kcal/mol) among others.The amino acids that interacted with robinin were Asn142; Gly143; Arg188; Thr190.The binding affinity of robinin surpassed the binding affinity of ritonavir (-7.7 kcal/mol) and lopinavir (-8.2 kcal/mol).The replacement of the hydroxyl group from the flavonoid skeleton at C-7, C-4' was proposed to affect the binding affinity.The free hydroxyl group particularly in A ring and the position of the hydroxyl group were important to improve the binding affinity.The molecular dynamic simulation showed the stability of M pro -robinin during the simulation period.The ADME evaluation referring to Lipinski`s rule of 5 revealed that the flavonoids (2,5,6,9,10,13,14,15) show low oral bioavailability and absorption.Robinin exhibited a good druglikeness score (value:1) with an unconcerned level of acute toxicity.From this study, it was concluded that robinin showed the most potent natural flavonoids studied to inhibit SASR-CoV-2 M pro by both docking study and ADME/tox properties evaluation.