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Published on: September 2, 2019
Study the interaction between juglone and calf thymus DNA by spectroscopic and molecular docking techniques
Bingjun Shen1, Huiru Yang1, Jiaqi Chen1
1Department of Bioengineering, School of Life Science and Technology, Changchun University of Science and Technology, NO.7186 Weixing Road, Changchun City, Jilin Province 085238, PR China.
Juglone, a compound from Cortex Juglandis Mandshuricae, interacts with calf thymus DNA (ctDNA). This study reveals Juglone intercalates into DNA, suggesting potential anti-cancer mechanisms.
Area of Science:
- Biochemistry
- Molecular Biology
- Pharmacology
Background:
- Juglone is a key compound in Cortex Juglandis Mandshuricae, used in traditional anti-cancer remedies.
- Limited research exists on Juglone's DNA interaction and mechanism of action.
Purpose of the Study:
- To investigate the interaction mechanism between Juglone and calf thymus DNA (ctDNA).
- To elucidate the molecular basis of Juglone's potential anti-cancer activity.
Main Methods:
- Fluorescence spectroscopy with ethidium bromide (EB) probe.
- UV-vis absorption spectroscopy.
- Salt effect, DNA melting point (Tm) analysis, resonance scattering spectroscopy, and molecular docking.
Main Results:
- Juglone quenched EB-fluorescence, decolorized ctDNA absorption, and enhanced resonance scattering.
- Interaction increased ctDNA Tm by 5.0°C, with a binding constant (KA) of 2.12 × 10^5 L/mol.
- Molecular docking indicated Juglone intercalation into the DNA groove.
Conclusions:
- Juglone binds to ctDNA via intercalation, driven by entropy.
- The interaction is spontaneous and endothermic, with Juglone embedding in the DNA groove.
- Findings support Juglone's potential as an anti-cancer agent targeting DNA.
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