Abstract
Triplex forming 3′-protected pyrimidine oligo(2′-O-methylribonucleotides) containing minor groove binders (MGB) and triplex specific intercalator, benzoindoloquinoline (BIQ), at the 5′-terminus were synthesized. The resulting conjugates formed stable complexes with a target dsDNA due to the simultaneous binding to the minor and major grooves and BIQ intercalation. The dissociation constants and the thermal stability were evaluated for the conjugate complexes with the model dsDNA corresponding to the polypurine tract (PPT) of the nef and pol genes from the HIV proviral genome. The conjugation of oligo(2′-O-methylribonucleotides) with MGB and BIQ was shown to increase the stability of the triple complexes with dsDNA at pH 7.2 and 37°C. Moreover, the intercalator accelerates the process of the complex formation. The dosedependent arrest of the in vitro transcription was demonstrated when a 780-bp DNA fragment containing the polypurine tract was transcribed under the control of T7 promoter in the presence of different concentrations of conjugates of oligo(2′-O-methylribonucleotides) containing MGB and BIQ.
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Abbreviations
- BIQ:
-
6-[(3-aminopropyl)amino]-11-methoxy-13H-benzo[6,7]indolo[3,2-c]quinoline
- Cm :
-
2′-O-methylribo-cytidine
- DMAP:
-
4-N,N′-dimethylaminopyridine
- γ:
-
γ-ami-nobutyric acid
- HEPES:
-
(4-(2-hydroxyethyl)-1-piperazine ethanesulfonic acid)
- Im:
-
N-methylimidazole
- MES:
-
2-(N-morpholino)ethanesulphonic acid
- MGB:
-
minor groove binder
- Nm :
-
2′-O-methylribonucleoside
- Py :
-
N-methylpyrrole
- inv T :
-
thymidine attached via 3′-3′-phosphodiester internucleotide bond (“inverted” thymidine)
- TEA:
-
triethylamine
- TFO:
-
triplexforming oligonucleotides
- Um :
-
2′-O-methyluridine
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Original Russian Text © D.S. Novopashina, A.N. Sinyakov, V.A. Ryabinin, L. Perrouault, C. Giovannangeli, A.G. Venyaminova, A.S. Boutorine, 2013, published in Bioorganicheskaya Khimiya, 2013, Vol. 39, No. 2, pp. 159–174.
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Novopashina, D.S., Sinyakov, A.N., Ryabinin, V.A. et al. Oligo(2′-O-methylribonucleotides) and their derivatives: IV. Conjugates of oligo(2′-O-methylribonucleotides) with minor groove binders and intercalators: Synthesis, properties, and application. Russ J Bioorg Chem 39, 138–152 (2013). https://doi.org/10.1134/S1068162013010081
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DOI: https://doi.org/10.1134/S1068162013010081