[Interaction of topotecan--a DNA topoisomerase I inhibitor--with dual-stranded polydeoxyribonucleotides. II. Formation of a complex containing several DNA molecules in the presence of topotecan].
Article Details
- CitationCopy to clipboard
strel'tsov SA, Mikheikin AL, Nechipurenko IuD
[Interaction of topotecan--a DNA topoisomerase I inhibitor--with dual-stranded polydeoxyribonucleotides. II. Formation of a complex containing several DNA molecules in the presence of topotecan].
Mol Biol (Mosk). 2001 May-Jun;35(3):442-50.
- PubMed ID
- 11443926 [ View in PubMed]
- Abstract
This study is a continuation of a series of papers dealing with topotecan interaction with double-stranded polydeoxyribonucleotides. We showed earlier that topotecan molecules form dimers in solution at concentration above 10(-5) (per base pair). Topotecan interaction with calf thymus DNA in solutions of low ionic strength was studied by fluorescence, circular dichroism, and linear flow dichroism. The data obtained indicate that topotecan forms two types of complex with DNA, DNA molecules combining with each other during formation of one of these complexes. The association constant of two topotecan-filled DNA molecules with each other was estimated at 10(4) M-1 (per base pair) in 1 mM sodium cacodylate buffer, pH 6.8, at 20 degrees C. A possibility of modulation of DNA topoisomerase I activity by topotecan due to complexation with several sites of a supercoiled DNA molecule is discussed.
DrugBank Data that Cites this Article
- Drug Targets
Drug Target Kind Organism Pharmacological Action Actions Topotecan DNA topoisomerase 1 Protein Humans YesInhibitorDetails