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. 1994 Mar 11;22(5):787–791. doi: 10.1093/nar/22.5.787

Infrared linear dichroism studies of DNA-drug complexes: quantitative determination of the drug-induced restriction of the B-A transition.

H Fritzsche 1
PMCID: PMC307883  PMID: 8139919

Abstract

The B-A transition of films or fibers of NaDNA occurs at a relative humidity of 75-85%. The fraction of DNA that changed the conformation from B to A form can be determined quantitatively by infrared linear dichroism. DNA-binding drugs can 'freeze' a fraction of DNA in the B form. This fraction of DNA is in the B form and cannot be converted to A-DNA even at a reduced relative humidity of 54%. The 'freezing' potentiality of various drugs can be described by the 'freezing' index, FI, expressed in base pairs per added drug. Drugs with a high value of FI (more than eight base pairs per drug) were observed among both intercalating and groove-binding drugs. High values of FI imply restriction of the conformational flexibility of DNA significantly going beyond the binding site of the drug. This long-range effect of drugs on the conformational flexibility of DNA may be connected with the molecular mechanism of drug action. The freezing index FI is a new quantitative parameter of drug-DNA interaction that should be considered as a valuable tool for drug design.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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