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Binding of chloroquine to DNA
1Department of Microbiology, City University of New York Medical School, City College, NY 10031.
Molecular and Biochemical Parasitology
|June 1, 1989
Summary
Chloroquine
Area of Science:
- Medicinal Chemistry
- Parasitology
- Molecular Biology
Background:
- Antimalarial drug chloroquine's mechanism of action is debated.
- Proposed mechanisms include DNA binding, hemin binding, and lysosome alkalinization.
Purpose of the Study:
- To investigate the significance of DNA binding in chloroquine's antimalarial activity.
- Quantify the affinity between chloroquine and DNA.
Main Methods:
- Equilibrium dialysis was employed to measure DNA-chloroquine binding.
- Tritiated chloroquine was used to quantify binding affinity.
Main Results:
- The dissociation constant (Kd) for the DNA-chloroquine complex ranged from 27 µM to 2.6 mM.
- Chloroquine-DNA binding affinity is significantly influenced by buffer ionic strength (salt concentration).
Conclusions:
- Despite salt-dependent binding, the abundance of DNA sites suggests it could contribute to chloroquine's antimalarial effect.
- Further research is needed to fully elucidate chloroquine's antimalarial mechanism.