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Furoquinoline and bisindole alkaloids from the roots of Teclea nobilis and their in-silico molecular docking analysis

Abstract Teclea nobilis is a medicinal plant widely used to treat oral pathogens, gonorrhea, fever, analgesics, asthma, joint pains, pneumonia, and intestinal worms in Ethiopia. Anticipated by these claims, column chromatographic separation of the roots extract of T. nobilis led to the isolation of eight alkaloids (1–8). The structures of the isolated compounds were identified based on their NMR (1D and 2D) spectral data analysis and comparison with reported literature data. In-silico molecular docking analysis of the isolated compounds were performed against Staphylococcus aureus DNA Gyrase (PDB ID: 2XCT) and human topoisomerase IIβ DNA (PDB ID: 3QX3) by using AutoDock Vina. ADMET analysis were performed by SwissADME, PreADMET, and OSIRIS Property predictions. The study revealed that the isolated compounds exhibited promising binding affinity to DNA gyrase, especially with compound 5 forms a stable drug-protein complex. Whereas the ADME and drug-likeness analysis revealed that compound 5 is less absorbed from the gastrointestinal tract, crossblood brain barrier and a P-glycoprotein substrate. This indicated that compound 5 could be a good candidate as anticancer agent provided that in vivo analysis done for more confirmation.