Synthesis, structure, protein binding of Cu(II) complexes with a tridentate NNO Schiff-base ligand

Li, Mei; Huang, Shujuan; Cheng, Yukun; Xie, Yong‐Rong

doi:10.1016/j.saa.2015.05.064

Cited by 10 publications

(1 citation statement)

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“…Fluorescence quenching is characterized by two types of mechanisms, usually classified as dynamic and static. Dynamic quenching refers to a process that involves the fluorophore and the quencher coming into contact during transient existence of the excited state, whereas static quenching refers to the formation of fluorophore-quencher complex [ 18 ]. Fluorescence quenching is described by the Stern–Volmer equation:

where F 0 and F are the fluorescence intensities before and after the addition of the quencher, respectively, k q is the bimolecular quenching constant, τ 0 is the lifetime of the fluorophore in the absence of the quencher (τ 0 = 10 −8 s), [Q] is the concentration of the quencher, and K sv is the Stern–Volmer quenching constant.…”

Section: Resultsmentioning

confidence: 99%

Interaction of Flavonoids from Woodwardia unigemmata with Bovine Serum Albumin (BSA): Application of Spectroscopic Techniques and Molecular Modeling Methods

Pan

Shen

et al. 2017

Molecules

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Phytochemical investigation on the methanol extract of Woodwardia unigemmata resulted in the isolation of seven flavonoids, including one new flavonol acylglycoside (1). The structures of these compounds were elucidated on the basis of extensive spectroscopic analysis and comparison of literature data. The multidrug resistance (MDR) reversing activity was evaluated for the isolated compounds using doxorubicin-resistant K562/A02 cells model. Compound 6 showed comparable MDR reversing effect to verapamil. Furthermore, the interaction between compounds and bovine serum albumin (BSA) was investigated by spectroscopic methods, including steady-state fluorescence, synchronous fluorescence, circular dichroism (CD) spectroscopies, and molecular docking approach. The experimental results indicated that the seven flavonoids bind to BSA by static quenching mechanisms. The negative ΔH and ΔS values indicated that van der Waals interactions and hydrogen bonds contributed in the binding of compounds 2–6 to BSA. In the case of compounds 1 and 7 systems, the hydrophobic interactions play a major role. The binding of compounds to BSA causes slight changes in the secondary structure of BSA. There are two binding sites of compound 6 on BSA and site I is the main site according to the molecular docking studies and the site marker competitive binding assay.

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Section: Resultsmentioning

confidence: 99%

Interaction of Flavonoids from Woodwardia unigemmata with Bovine Serum Albumin (BSA): Application of Spectroscopic Techniques and Molecular Modeling Methods

Pan

Shen

et al. 2017

Molecules

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Thermally Stable Schiff Base and its Metal Complexes: Molecular Docking and Protein Binding Studies

Kamacı

Peksel

2017

J Fluoresc

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In this paper, interaction of Schiff base and its metal complexes carrying naphthalene ring in the structure with bovine serum albumin (BSA) were investigated using UV-vis absorption, fluorescence spectroscopies and molecular docking methods. The effect on the binding mechanism and properties of these compounds containing metal-free, iron and copper ions were also investigated. The fluorescence spectroscopy results showed that fluorescence intensity of BSA in the presence of different concentration of ligands was decreased through a static quenching mechanism. Binding constants (KSV, Kbin and Ka) and thermodynamic parameters (ΔG, ΔH and ΔS) for the ligand-protein interactions were also determined. ΔG values of ligand-protein interaction were calculated in the range - 6.3 to -5.5 kcal/mol. These negative values showed that binding process is spontaneous and, hydrogen bonding and van der Waals force were main interaction of the protein and ligands. ΔH and ΔS value were also calculated in the range of 1.10 to 1.26 kJ/mol and 0.133 to 0.135 kJ/mol. K, respectively. These positive values indicated that the binding process between ligands and BSA are endothermic and electrostatic interaction, respectively.

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Three novel complexes of copper: synthesis, characterization, crystal structure, HSA-binding and docking studies, and antiproliferative activity

et al. 2020

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Synthesis, structure, protein binding of Cu(II) complexes with a tridentate NNO Schiff-base ligand

Cited by 10 publications

References 50 publications

Interaction of Flavonoids from Woodwardia unigemmata with Bovine Serum Albumin (BSA): Application of Spectroscopic Techniques and Molecular Modeling Methods

Interaction of Flavonoids from Woodwardia unigemmata with Bovine Serum Albumin (BSA): Application of Spectroscopic Techniques and Molecular Modeling Methods

Thermally Stable Schiff Base and its Metal Complexes: Molecular Docking and Protein Binding Studies

Three novel complexes of copper: synthesis, characterization, crystal structure, HSA-binding and docking studies, and antiproliferative activity

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