19800-49-8Relevant articles and documents
Interaction of Functionalized Naphthalenophanes with Abasic Sites in DNA: DNA Cleavage, DNA Cleavage Inhibition, and Formation of Ligand–DNA Adducts
Caron, Coralie,Duong, Xuan N. T.,Guillot, Régis,Bombard, Sophie,Granzhan, Anton
, p. 1949 - 1962 (2019)
Ligands interacting with abasic (AP) sites in DNA may generate roadblocks in base-excision DNA repair (BER) due to indirect inhibition of DNA repair enzymes (e.g., APE1) and/or formation of toxic byproducts, resulting from ligand-induced strand cleavage or covalent cross-links. Herein, a series of 12 putative AP-site ligands, sharing the common naphthalenophane scaffold, but endowed with a variety of substituents, have been prepared and systematically studied. The results demonstrate that most naphthalenophanes bind to AP sites in DNA and inhibit the APE1-induced hydrolysis of the latter in vitro. Remarkably, their APE1 inhibitory activity, as characterized by IC50 and KI values, can be directly related to their affinity and selectivity to AP sites, as assessed by means of fluorescence melting experiments. On the other hand, the molecular design of naphthalenophanes has a crucial influence on their intrinsic AP-site cleavage activity (i.e., ligand-catalyzed β- and β,δ-elimination reactions at the AP site), as illustrated by the compounds either having an exceptionally high AP-site cleavage activity (e.g., 2,7-BisNP-S, 125-fold more efficacious than spermine) or being totally devoid of this activity (four compounds). Finally, the unprecedented formation of a stable covalent DNA adduct upon reaction of one ligand (2,7-BisNP-NH) with its own product of the AP-site cleavage is revealed.
Macrocyclic DNA-mismatch-binding ligands: Structural determinants of selectivity
Granzhan, Anton,Largy, Eric,Saettel, Nicolas,Teulade-Fichou, Marie-Paule
supporting information; experimental part, p. 878 - 889 (2010/09/05)
A collection of 15 homodi- meric and 5 heterodimeric macrocyclic bisintercalators was prepared by one- or two-step condensation of aromatic dialdehydes with aliphatic diamines; notably, the heterodimeric scaffolds were synthesized for the first time. The binding of these macrocycles to DNA duplexes containing a mispaired thy- mine residue (TX), as well as to the fully paired control (TA), was investi- gated by thermal denaturation and flu- orescent-intercalator-displacement experiments. The bisnaphthalene derivatives, in particular, the 2, 7-disubstituted ones, have the highest selectivity for the TX mismatches, as these macrocy- cles show no apparent binding to the fully paired DNA. By contrast, other macrocyclic ligands, as well as seven conventional DNA binders, show lesser or no selectivity for the mismatch sites. The study demonstrates that the topology of the ligands plays a crucial role in determining the mismatch-binding affinity and selectivity of the macrocy- clic bisintercalators. 2010 Wiley-VCH Verlag GmbH & Co. KGaA.
