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    Understanding the electronic structure of the alkaloid in scorpion venom through drug adsorption and molecular docking studies on COVID-19 proteins
    (Elsevier, 2023) Ilavarasi, Anbumani Velmurugan; Paularokiadoss, Francisxavier; Novena, L. Mary; Pooventhiran, T.; Erkan, Sultan; Celaya, Christian A.; Thomas, Renjith
    Electronic structure analysis of the alkaloid from scorpion venom (ASV) was studied at the B3LYP/6-311++G (d, p) level of theory. Vibrational analysis, molecular orbital analysis and the MEP and contour plot analysis show the reactivity and molecular stability of the compound. The measured frontier molecular orbital energy distance (ELUMO-EHOMO) is 4.12 eV. The reactive descriptors research found that the ASV molecule has a chemical hardness of 2.205 eV and an electronegativity of 3.325 eV, consistent with its biological activity. The calculated NLA parameters & mu;o, & alpha;o, and & beta;degrees values of the title molecule are 1.5009 Debye,-5.718 x 10-24 e.s.u, 2.984 x 10-30 e.s.u, respectively. The alkaloid from scorpion venom is found to form stable complexes with cyclodextrin. ASV was docked against the main proteases (MPro) and papain-like proteases (PLpro) of COVID-19. ASV has a Glide docking score of-8.017 kcal/mol with MPro and-5.091 kcal/mol with PLpro. ASV has a Prime MM-GBSA binding score of-51.74 kcal/mol with MPro and-32.19 kcal/mol with PLpro. The Glide and Prime results demonstrated that ASV has a stronger binding for MPro than PLpro protein. Furthermore, the major pharmacokinetic characteristics of ASV were predicted. ASV was found to have good drug-like properties with no violations. Since ASV binds to COVID-19 proteases, it could be used as an anti-COVID-19 agent. The outcomes of the study may have a substantial impact on the development of COVID-19 therapies.