DNA-interacting properties of two analogous square-planar cis-chlorido complexes: copper versus palladium

• Published in: Journal of biological inorganic chemistry Vol. 26; no. 6; pp. 727 - 740
• Main Authors: Palmeira-Mello, Marcos V., Caballero, Ana B., Lopez-Espinar, Aida, Guedes, Guilherme P., Caubet, Amparo, de Souza, Alessandra M. Teles, Lanznaster, Mauricio, Gamez, Patrick
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.09.2021; Springer Nature B.V
• Subjects: Aniline; Biochemistry; Biomedical and Life Sciences; Chlorides - chemistry; Circular Dichroism; Copper; Copper - chemistry; Crystallography, X-Ray; Deoxyribonucleic acid; DNA; DNA - chemistry; Electrostatic properties; Fluorescent Dyes; Hydrogen Bonding; Inorganic chemistry; Life Sciences; Ligands; Microbiology; Models, Molecular; Molecular Structure; Original Paper; Palladium; Palladium - chemistry; Salts; X-ray diffraction; Cleavage; Palladium(||); Copper(||); DNA interaction; Cisplatin; Molecular docking
• ISSN: 0949-8257; 1432-1327; 1432-1327
• DOI: 10.1007/s00775-021-01888-2

Two square-planar coordination compounds, namely [Cu(CPYA)Cl 2 ] ( 1 ) and [Pd(CPYA)Cl 2 ] ( 2 ), were prepared from the ligand 4-chloro- N -(pyridin-2-ylmethyl)aniline (CPYA) and two chloride salts, and were fully characterized, including by X-ray diffraction. Spectroscopic, electrophoretic and AFM studies revealed that the two isostructural compounds were interacting differently with DNA. In both cases, the initial interaction involves electrostatic contacts of the CPYA ligand in the minor groove (as suggested by molecular docking), but subsequent strong binding occurs with the palladium(II) complex 2 , whereas the binding with the copper complex 1 is weaker and concentration dependent. The strong binding of 2 eventually leads to the cleavage of the double strand and the redox activity of 1 allows to oxidatively cleave the biomolecule. Graphic abstract