6533b7d2fe1ef96bd125e212

RESEARCH PRODUCT

G-quadruplex vs. duplex-DNA binding of nickel(II) and zinc(II) Schiff base complexes

Antonino LauriaAnna Maria AlmericoBernhard K. KepplerRiccardo BonsignoreGiampaolo BaroneAlessio TerenziAnnamaria MartoranaAngelo Spinello

subject

Models MolecularCircular dichroismComputational chemistryInorganic chemistryBinding constantchemistry.chemical_elementZincCircular dichroism010402 general chemistryG-quadruplexDNA G-quadruplex nickel01 natural sciencesBiochemistryInorganic Chemistrychemistry.chemical_compoundNickelheterocyclic compoundsSchiff BasesSchiff base010405 organic chemistryOligonucleotidezincDNABinding constantSettore CHIM/08 - Chimica Farmaceutica0104 chemical sciencesG-QuadruplexesCrystallographyNickelchemistryDuplex (building)Settore CHIM/03 - Chimica Generale E Inorganica

description

Novel nickel(II) (1) and zinc(II) (2) complexes of a Salen-like ligand, carrying a pyrimidine ring on the N,N' bridge, were synthesized and characterized. Their interaction with duplex and G-quadruplex DNA was investigated in aqueous solution through UV-visible absorption, circular dichroism and viscometry measurements. The results obtained point out that, while the zinc(II) complex does not interact with both duplex and G-quadruplex DNA, the nickel(II) complex 1 binds preferentially to G-quadruplex respect to duplex-DNA, with values of the DNA-binding constants, Kb, 2.6×10(5)M(-1) and 3.5×10(4)M(-1), respectively. Molecular dynamics simulations provided an atomic level model of the top-stacking binding occurring between 1 and hTelo (a 22-mer sequence oligonucleotide) in G-quadruplex conformation.

yearjournalcountryeditionlanguage
2016-08-01
10.1016/j.jinorgbio.2016.05.010http://hdl.handle.net/10447/214676