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Updated: Jul 14, 2026
Quantifying the Binding Interactions Between Cu(II) and Peptide Residues in the Presence and Absence of Chromophores
Published on: April 5, 2022
[Synthesis and DNA binding spectroscopic studies of Cu(II)-HAsp-Im complexes]
Fang Zhang1, Qian-qian Zhang, Xiao-lan Lu
1College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266003, China.
Abstract:
Two novel complexes of [Cu(HAsp)ImH2O]SO4 x 4 H2O and [Cu(Asp)Im(OH)] x 4 H2O (HAsp = Aspartic acid molecule, Asp = Aspartic acid ion, Im = Imidazole) were synthesized and characterized by elemental analysis, IR spectroscopy and TG-DTA. The interactions of the complexes with sperm DNA were studied by electronic absorption and fluorescence spectra. Results showed that the reactions of the two complexes with DNA are obviously different: for [Cu(HAsp)ImH2O]SO4 x 4 H2O, it is intercalation companied by electrostatic effect, while [Cu(Asp)Im(OH)] x 4 H2O mainly cooperates with the nitrogen atom of the DNA base pair, which induces the breakage of DNA double helix. The reasons for these differences in their DNA binding modes were also discussed.
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