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Updated: Apr 11, 2026
Atomic Force Microscopy Investigations of DNA Lesion Recognition in Nucleotide Excision Repair
Published on: May 24, 2017
Study on the interactions between anti-cancer drug oxaliplatin and DNA by atomic force microscopy
Leipeng Li1, Ruisi Liu2, Fengjie Xu2
1Institute of higher education, Northeast Forestry University, Harbin 150040, People's Republic of China.
Abstract:
Oxaliplatin is one of the most important anticancer drugs at present. However, the mechanism of action of oxaliplatin is still controversial. In this study, the interactions between oxaliplatin and a plasmid DNA have been studied so as to reveal the structural basis of its activity. The structural characteristic of pUC19 DNA (2ng/μL) incubated with 100μmol/L and 1000μmol/L of oxaliplatin for the different time on a freshly cleaved highly ordered pyrolytic graphite (HOPG) surface was investigated by atomic force microscopy (AFM). High resolution AFM observation indicated that oxaliplatin can induce pUC19 DNA molecules change from the extended conformation to the entangled structures with many nodes, and finally to the compact particles. The present AFM results provide structural evidence about the interactions between oxaliplatin and circular duplex DNA containing multiple targets.
Insights
Oxaliplatin, a key anticancer drug, alters plasmid DNA structure. Atomic force microscopy reveals DNA changes from extended to entangled and compact forms, offering insights into its mechanism of action.
Area of Science:
- Biochemistry
- Molecular Biology
- Nanotechnology
Background:
- Oxaliplatin is a crucial chemotherapeutic agent.
- Its precise mechanism of action remains under investigation.
- Understanding drug-DNA interactions is vital for cancer therapy.
Purpose of the Study:
- To investigate the structural interactions between oxaliplatin and plasmid DNA.
- To elucidate the structural basis of oxaliplatin's anticancer activity.
- To provide structural evidence for oxaliplatin-DNA binding.
Main Methods:
- Atomic Force Microscopy (AFM) was employed to visualize DNA structures.
- pUC19 plasmid DNA was incubated with varying concentrations of oxaliplatin (100 μmol/L and 1000 μmol/L).
- Experiments were conducted on highly ordered pyrolytic graphite (HOPG) surfaces over different time intervals.
Main Results:
- Oxaliplatin induced significant structural changes in pUC19 DNA.
- DNA transitioned from an extended conformation to entangled structures with nodes.
- Further incubation led to the formation of compact DNA particles.
Conclusions:
- Oxaliplatin binding alters DNA conformation, leading to structural compaction.
- These structural modifications provide evidence for oxaliplatin's interaction with circular duplex DNA.
- The findings contribute to understanding the mechanism of action of oxaliplatin in cancer treatment.
