期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 24, 期 17, 页码 -出版社
MDPI
DOI: 10.3390/ijms241713517
关键词
surface-enhanced Raman spectroscopy; solid-state substrate; bendamustine; calf thymus DNA; drug-DNA interaction
In this study, the interaction properties of the anticancer drug BENDA with ctDNA were investigated using surface-enhanced Raman spectroscopy, UV-visible spectroscopy, and molecular docking simulation. The results showed that BENDA binds to ctDNA through covalent binding and hydrogen bonding, with the N7 atom of G base as the main binding site. This study helps to understand the mechanism of BENDA at the single-molecule level and provides guidance for the development of effective new drugs with low toxicity and side effects.
Bendamustine (BENDA) is a bifunctional alkylating agent with alkylating and purinergic antitumor activity, which exerts its anticancer effects by direct binding to DNA, but the detailed mechanism of BENDA-DNA interaction is poorly understood. In this paper, the interaction properties of the anticancer drug BENDA with calf thymus DNA (ctDNA) were systematically investigated based on surface-enhanced Raman spectroscopy (SERS) technique mainly using a novel homemade AuNPs/ZnCl2/NpAA (NpAA: nano porous anodic alumina) solid-state substrate and combined with ultraviolet-visible spectroscopy and molecular docking simulation to reveal the mechanism of their interactions. We experimentally compared and studied the SERS spectra of ctDNA, BENDA, and BENDA-ctDNA complexes with different molar concentrations (1:1, 2:1, 3:1), and summarized their important characteristic peak positions, their peak position differences, and hyperchromic/hypochromic effects. The results showed that the binding modes include covalent binding and hydrogen bonding, and the binding site of BENDA to DNA molecules is mainly the N7 atom of G base. The results of this study help to understand and elucidate the mechanism of BENDA at the single-molecule level, and provide guidance for the further development of effective new drugs with low toxicity and side effects.
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