title: Characterization of interaction of calf thymus DNA with gefitinib: spectroscopic methods and molecular docking.
abstract: The binding interaction of gefitinib with calf thymus DNA (ct-DNA) under the simulated physiological pH condition was studied employing UV absorption, fluorescence, circular dichroism (CD), viscosity measurement and molecular docking methods. The experimental results revealed that gefitinib preferred to bind to the minor groove of ct-DNA with the binding constant (Kb) of 1.29 × 10(4)Lmol(-1) at 298K. Base on the signs and magnitudes of the enthalpy change (ΔH(0)=-60.4 kJ mol(-1)) and entropy change (ΔS(0)=-124.7 J mol(-1)K(-1)) in the binding process and the results of molecular docking, it can be concluded that the main interaction forces between gefitinib and ct-DNA in the binding process were van der Waals force and hydrogen bonding interaction. The results of CD experiments revealed that gefitinib did not disturb native B-conformation of ct-DNA. And, the significant change in the conformation of gefitinib in gefitinib-ct-DNA complex was observed from the molecular docking results and the change was close relation with the structure of B-DNA fragments, indicating that the flexibility of gefitinib molecule also plays an important role in the formation of the stable gefitinib-ct-DNA complex.
authors.affiliation: College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310032, China; State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, Zhejiang University of Technology, Hangzhou 310032, China. Electronic address: shijh@zjut.edu.cn.
authors.forename: Jie-Hua
authors.initials: JH
authors.lastname: Shi
authors.affiliation: College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310032, China.
authors.forename: Ting-Ting
authors.initials: TT
authors.lastname: Liu
authors.affiliation: College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310032, China.
authors.forename: Min
authors.initials: M
authors.lastname: Jiang
authors.affiliation: College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310032, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.affiliation: College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310032, China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Wang
mesh_terms: D000818:Animals; D001667:Binding, Competitive; D002417:Cattle; D002942:Circular Dichroism; D004247:DNA / Q000737:chemistry* / Q000378:metabolism; D000077156:Gefitinib; D006860:Hydrogen Bonding; D062105:Molecular Docking Simulation; D009690:Nucleic Acid Conformation; D009994:Osmolar Concentration; D011799:Quinazolines / Q000737:chemistry* / Q000378:metabolism*; D013056:Spectrophotometry, Ultraviolet; D013816:Thermodynamics; D014783:Viscosity
chemical_list: D011799:Quinazolines; D004247:DNA; C427203:calf thymus DNA; D000077156:Gefitinib
keywords: Calf thymus DNA; Gefitinib; Interaction; Molecular docking; Spectroscopy