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. 1973 Apr;131(4):749–755. doi: 10.1042/bj1310749

Interaction of quinacrine mustard with mononucleotides and polynucleotides

Ritva-Kajsa Selander 1
PMCID: PMC1177534  PMID: 4578946

Abstract

1. The interaction between quinacrine mustard and mononucleotides and polynucleotides was investigated by fluorimetry and absorbance spectrophotometry. 2. The fluorescence spectrum of quinacrine mustard is independent of the ionic strength and pH. The dependence of the quinacrine mustard fluorescence intensity on ionic strength, pH and anions is described. 3. The fluorescence intensity of quinacrine mustard was enhanced with the mononucleotide adenylic acid and polynucleotides such as poly(rA), poly(rU) and poly(rA,rU). 4. Quenching of the fluorescence intensity of quinacrine mustard occurred with the mononucleotide guanylic acid and with poly(rG) and poly(rC,rG). 5. The mononucleotide cytidylic acid or poly(rC) showed no effect on the fluorescence intensity of quinacrine mustard. 6. The interaction between the dye and native DNA species was also dependent on the presence of base-specific binding sites in the DNA. The higher the (G+C) content was in the native DNA tested the higher was the quenching effect on the fluorescence intensity of quinacrine mustard. 7. No interaction was found between the dye and methylated DNA. The binding between quinacrine mustard and apurinic DNA was confirmed to be in the phosphate groups of the purines.

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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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