Sequence dependent effects in methylphosphonate deoxyribonucleotide double and triple helical complexes

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Sequence dependent effects in methylphosphonate deoxyribonucleotide double and triple helical complexes.

Deoxyribooligonucleotides containing 19 repeating bases of A, T or U were prepared with normal phosphodiester (dA19, dT19, dU19) or methylphosphonate (dA*19, dT*19, dU*19) linkages. Complexes of these strands have been investigated at 1:1 and 1:2 molar ratios (purine:pyrimidine) by thermal melting and gel electrophoresis. There are dramatic sequence dependent differences in stabilities of compl...

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The stabilities of eight triple helical pyrimidine.purine.pyrimidine structures comprised of identical sequence but different RNA (R) or DNA (D) strand combinations were measured by quantitative affinity cleavage titration. The differences in equilibrium binding affinities reveal the importance of strand composition. For the sequences studied here, the stabilities of complexes containing a pyri...

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Sequence-specific cleavage of double helical DNA by triple helix formation.

Homopyrimidine oligodeoxyribonucleotides with EDTA-Fe attached at a single position bind the corresponding homopyrimidine-homopurine tracts within large double-stranded DNA by triple helix formation and cleave at that site. Oligonucleotides with EDTA.Fe at the 5' end cause a sequence specific double strand break. The location and asymmetry of the cleavage pattern reveal that the homopyrimidine-...

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Lanthanide triple-stranded helical complexes with a substituted 2,6-pyridinedicarboxylate†

A 4-aminophenylethynyl substituent has been grafted into the 4-position of the pyridine ring in dipicolinic acid to yield ligand L the pKa’s of which are 8.77(5), 3.54(3), 2.58(1) and 1.01(3). Ligand L 4 reacts with trivalent lanthanide ions to give stable triple-stranded helical complexes in water (logβ13 = 13.7(1) for Eu). The separation of the contact and pseudocontact contributions to the N...

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Preparation of CuO nanoparticles by thermal decomposition of double-helical dinuclear copper(II) Schiff-base complexes

In this paper, two double helical dinuclear copper(II) complexes of bis-N,O-bidentate Schiff base ligands bis(3-methoxy-N-salicylidene-4,4'-diaminodiphenyl)sulfone (L1) and bis(5-bromo-N-salicylidene-4,4'-diaminodiphenyl)sulfone (L2) were prepared and characterized by elemental analyses (CHN), as well as thermal analysis. Elemental analyses (CHN) suggested that the reaction between ligands and ...

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ژورنال

عنوان ژورنال: Nucleic Acids Research

سال: 1990

ISSN: 0305-1048,1362-4962

DOI: 10.1093/nar/18.12.3545