Bis-Intercalation of a Homodimeric Thiazole Orange Dye in DNA in Symmetrical Pyrimidine-Pyrimidine-Purine-Purine Oligonucleotides
| Autor: | Lene Hansen, Lisbeth Krüger Jensen, Jens Peter Jacobsen |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Purine
Base Sequence Pyrimidine Oligonucleotide Stereochemistry Molecular Sequence Data Intercalation (chemistry) Oligonucleotides Cooperative binding DNA Biology Thiazoles chemistry.chemical_compound Pyrimidines Biochemistry chemistry Purines Quinolines Genetics Proton NMR Benzothiazoles Purine metabolism Fluorescent Dyes Research Article |
| Zdroj: | Nucleic Acids Research. 24:859-867 |
| ISSN: | 1362-4962 0305-1048 |
| DOI: | 10.1093/nar/24.5.859 |
| Popis: | One- and two-dimensional 1H NMR spectroscopy were used to characterize the binding of a homodimeric thiazole orange dye, 1,1'-(4,4,8,8-tetramethyl-4,8-diazaundecamethylene)-bis-4-(3 -methyl-2,3-dihydro-(benzo- 1,3-thiazole)-2-methylidene)-quinolinium tetraiodide (TOTO), to various double-stranded DNA oligonucleotides containing symmetric (5'-pyr-pyr-pu-pu-3')2 or (5'-pu-pu-pyr-pyr-3')2 sequences. It was found that TOTO binds preferentially to oligonucleotides containing a (5'-CTAG-3')2 or a (5'-CCGG-3')2 sequence. Binding to the (5'-CCGG-3')2 sequence is less favored than to the (5'-CTAG-3')2 sequence. The complexes of TOTO with d(CGCTAGCGCTAGCG)2 (10) and d(CGCTAGCCGGCG):d(CGCCGGCTAGCG) (11) oligonucleotides, each containing two preferential binding sites, was also examined. In both cases TOTO forms mixtures of 1:1 and 1:2 dsDNA-TOTO complexes in ratios dependent on the relative amount of TOTO and the oligonucleotides in the sample. Binding of TOTO to the two oligonucleotides is sequence selective at the (5'-CTAG-3')2 and (5'-CCGG-3')2 sites. The 1H NMR spectra of both the 1:2 complexes and the three different 1:1 complexes have been assigned. A slight negative cooperativity is observed in formation of the 1:2 complexes. The ratio between the two different 1:1 complexes formed with oligonucleotide 11 is 2.4 in favor of binding to the (5'-CTAG-3')2 site. This is very similar to results obtained when the two sites are in different oligonucleotides. Thus the distribution of TOTO among the (5'-CTAG-3')2 and (5'-CCGG-3')2 sites is independent of whether the two sites are in the same or two different oligonucleotides. |
| Databáze: | OpenAIRE |
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