Fraxinellone is an important botanical lactone compound and has been demonstrated to have insecticidal activity. To provide theoretical support to the assessment on the safety of utilizing fraxinellone as a natural insecticidal agent, the interactions between fraxinellone and armyworm DNA, salmon sperm DNA and calf thymus DNA were investigated using UV–Vis absorption spectroscopy, isothermal titration calorimetry, and molecular docking. Results showed that there were two types of combinations between fraxinellone and three kinds of DNA. Type I combination had an equilibrium constant of combination (Ka1) of about 105 and binding sites (n1) of 0.40–0.70, while type II combination had an equilibrium constant of combination (Ka2) of 103 and binding sites (n2) of 1.35–3.15. Results of molecular docking showed that there were non-classical embedding type interactions between fraxinellone and three kinds of DNA, with the reaction taking place in small groove areas of the DNA structure, resulting in relatively weak interactive forces.
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This work was funded by the Natural Science Foundation of Shaanxi Province (No. 2019JQ-582) and the Doctoral Scientific Research Starting Foundation of Baoji University of Arts and Science (No. ZK2018048 and No. ZK2017045).
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Lei, J., Gou, X., Wei, S. et al. Spectroscopy, Thermodynamics and Molecular Docking of Fraxinellone with DNA. Bull Environ Contam Toxicol 104, 864–870 (2020). https://doi.org/10.1007/s00128-020-02860-7
- Isothermal titration calorimetry
- Molecular docking
- Botanical insecticide