Multi-spectroscopic and molecular docking studies on the interaction of neotame with calf thymus DNA |
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| Authors: | Fahimeh Kheirdoosh Mahsa Pazhavand Mahya Sariaslani Neda Hosseinpour Moghadam Sadegh Salehzadeh |
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| Affiliation: | 1. Department of Applied Chemistry, Faculty of Chemistry, Razi University, Kermanshah, Islamic Republic of Iran;2. fkheirdoosh@yahoo.com;4. School of paramedical, Kermanshah University of Medical Science, Kermanshah, Iran;5. Research Center for Molecular Medicine, Hamadan University of Medical Sciences, Hamadan, Iran;6. Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran |
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| Abstract: | AbstractIn this paper, we have studied the in vitro binding of neotame (NTM), an artificial sweetener, with native calf thymus DNA using different methods including spectrophotometric, spectrofluorometric, competition experiment, circular dichroism (CD), and viscosimetric techniques. From the spectrophotometric studies, the binding constant (Kb) of NTM-DNA was calculated to be 2?×?103 M?1. The quenching of the intrinsic fluorescence of NTM in the presence of DNA at different temperatures was also used to calculate binding constants (Kb) as well as corresponding number of binding sites (n). Moreover, the obtained results indicated that the quenching mechanism involves static quenching. By comparing the competitive fluorimetric studies with Hoechst 33258, as a known groove probe, and methylene blue, as a known intercalation probe, and iodide quenching experiments it was revealed that NTM strongly binds in the grooves of the DNA helix, which was further confirmed by CD and viscosimetric studies. In addition, a molecular docking method was employed to further investigate the binding interactions between NTM and DNA, and confirm the obtained results. |
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| Keywords: | DNA interaction neotame groove binding mode UV-spectroscopy fluorescence quenching molecular docking |
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