In vitro anticancer activity and evaluation of DNA duplex binding affinity of phenyl-substituted indoloquinolines
摘要:
Phenyl-substituted indoloquinolines were studied for their biological activity and their DNA binding affinity. Water-soluble aminoalkyl derivatives were prepared and have shown significant in vitro anticancer activity. Unlike previous reports on the potential role of duplex DNA as target for various indoloquinoline based drugs, duplex UV melting experiments and fluorescence titrations suggest only weak and moderately strong binding of the phenyl-substituted indoloquinolines at 120 mM and 20 mM Na+ concentrations, respectively. Binding is suggested by ethidium displacement and circular dichroism experiments to be associated with drug intercalation between base pairs. (C) 2011 Elsevier Ltd. All rights reserved.
In vitro anticancer activity and evaluation of DNA duplex binding affinity of phenyl-substituted indoloquinolines
摘要:
Phenyl-substituted indoloquinolines were studied for their biological activity and their DNA binding affinity. Water-soluble aminoalkyl derivatives were prepared and have shown significant in vitro anticancer activity. Unlike previous reports on the potential role of duplex DNA as target for various indoloquinoline based drugs, duplex UV melting experiments and fluorescence titrations suggest only weak and moderately strong binding of the phenyl-substituted indoloquinolines at 120 mM and 20 mM Na+ concentrations, respectively. Binding is suggested by ethidium displacement and circular dichroism experiments to be associated with drug intercalation between base pairs. (C) 2011 Elsevier Ltd. All rights reserved.
covalently coupled to a 7 mer oligonucleotide at its 5'- or 3'-end. The stability of triplexes formed from the conjugates and a double-helical target was studied by UV melting experiments. Compared to the unmodified control triple helices, triplexes with the conjugate exhibit a significantly higher stability. However, the degree of stabilization depends on the particular triplex structure formed.
Spectroscopic studies on the formation and thermal stability of DNA triplexes with a benzoannulated δ-carboline–oligonucleotide conjugate
作者:Andrea Eick、Zhou Xiao、Peter Langer、Klaus Weisz
DOI:10.1016/j.bmc.2008.09.026
日期:2008.10
A benzoannulated delta-carboline with a phenyl substituent has been covalently tethered to the 3 '-end of a triplex-forming oligonucleotide and its ability to bind and stabilize DNA triple helices has been examined by various spectroscopic methods. UV thermal melting experiments were conducted with different hairpin duplexes and with a complementary single-stranded oligonucleotide as targets for the conjugate. The delta-carboline ligand preferentially binds triplexes over duplexes and leads to a temperature increase of the triplex-to-duplex transition by up to 23 degrees C. The results obtained from UV, CD and. fluorescence measurements suggest that the delta-carboline ligand exhibits specific interactions with a triplex and favors binding by intercalation at the triplex-duplex junction. (C) 2008 Elsevier Ltd. All rights reserved.