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Interaction of novel bis(platinum) complexes with DNA
J D Roberts1, B Van Houten, Y Qu
1Vermont Regional Cancer Center, University of Vermont, Burlington 05405.
Nucleic Acids Research
|December 11, 1989
Summary
Novel bis(platinum) complexes show significantly higher interstrand DNA crosslinking than cisplatin, forming unique structures. These complexes are recognized by DNA repair enzymes, suggesting potential as advanced anticancer agents.
Area of Science:
- Medicinal Chemistry
- Molecular Biology
- Cancer Research
Background:
- Bis(platinum) complexes are novel anticancer agents with two platinum groups linked by an alkyldiamine.
- These complexes possess unique tetrafunctional potential compared to existing agents.
Purpose of the Study:
- To investigate the DNA interaction differences between bis(platinum) complexes and cisplatin.
- To characterize the DNA adducts formed by bis(platinum) complexes.
Main Methods:
- Gel electrophoresis under denaturing conditions to detect interstrand crosslinks.
- Studies using E. coli UvrABC nuclease complex to assess DNA repair and binding specificity.
Main Results:
- Bis(platinum) adducts formed interstrand crosslinks 250-fold more frequently than cisplatin adducts.
- Bis(platinum) complexes created novel interstrand crosslinks by binding to opposite DNA strands.
- Unlike cisplatin, bis(platinum) binding did not unwind supercoiled DNA.
- Both linear and supercoiled DNA with bis(platinum) adducts were incised by UvrABC nuclease.
Conclusions:
- Bis(platinum) complexes exhibit distinct DNA binding mechanisms compared to cisplatin, favoring interstrand crosslinks.
- The DNA adducts formed by bis(platinum) complexes are substrates for the UvrABC repair system.
- Bis(platinum) complexes represent a promising class of anticancer agents with unique DNA interaction profiles.