Determination of binding constant of DNA-binding drug to target DNA by surface plasmon resonance biosensor technology.

The experimental determination of the binding constant of a drug for its target molecule is of considerable importance. It is a basic experimental parameter in a variety of studies, such as the prediction of drug efficiency, or in the pharmacokinetic drug interaction. DNA-binding drugs have been reported to be able to interfere in a sequence dependent manner with biological functions such as topoisomerase activity, restriction of enzyme cleavage of DNA, protein-DNA interactions and the activity of transcription factors, leading to alteration of gene expression.