THE CRUCIALITY OF THE 1, 2, 4-TRIOXANE RING IN THE BIOLOGICAL ACTIVITIES OF ANTICANCER ARTEMISININS: AN EXPERIMENT FOR CHEMICAL EDUCATION AT DIFFERENT LEVELS
DOI:
https://doi.org/10.36557/2674-9432.2026v5n3p319-342Palavras-chave:
Artemisinins; 1,2,4-trioxane ring; Molecular electrostatic potential; Molecular orbital; Ligand-receptor interaction.Resumo
In the proposed experiment, artemisinin and its derivatives (artemisinins), with and without the endoperoxide bridge, (R-O-O-R’), are investigated through molecular electrostatic potential (MEP), molecular orbitals (MOs), and their interactions with the biological receptors transferrin and heme, aiming to understand aspects of the interaction with the two biological receptors and to clarify the importance of the 1,2,4-trioxane ring in the antitumor activities of this class of compounds in HepG2 cells. The pattern of MEP maps obtained with the theoretical method B3LYP/6-31G** basis set indicates that artemisinins carrying the 1,2,4-trioxane ring are active against HepG2 liver cancer and may undergo electrophilic attacks by transferrin and heme receptors in the endoperoxide bridge region (C3-O2-O1-C12a). The positioning of MOs on artemisinin atoms supports the anchoring of transferrin and heme receptors in the ligand-receptor interaction process. Investigation of ligand-receptor, molecular docking, showed that artemisinins interacting with transferrin and heme exhibit d(O1Fe2+) < d(O2Fe2+), and these distances increase with biological activity (IC50). Comparison of d(O1Fe2+) and d(O2Fe2+) for transferrin and heme shows greater distances in the interaction with transferrin. Finally, investigation with MEP, MOs, and ligand-receptor interaction indicates the relevance of the 1,2,4-trioxane ring in the anticancer activity of artemisinins.
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