Parallel-stranded DNA with Hoogsteen base pairing stabilized by a trans-[Pt(NH3)2]2+ cross-link: characterization and conversion into a homodimer and a triplex

Abstract : The oligonucleotides 5'-d(TTTTCTTTTG) and 5'-d(AAAAGAAAAG) were cross-linked with a trans-[Pt(NH3)(2)](2+) entity via the N7 positions of the 3'-end guanine bases to give parallel-stranded (ps) DNA. At pH 4.2, CD and NMR spectroscopy indicate the presence of Hoogsteen base pairing. In addition, temperature-dependent UV spectroscopy shows an increase in melting temperature for the platinated duplex (35 degreesC) as compared to the non-platinated, antiparallel-stranded duplex formed from the same oligonucleotides (21 degreesC). A monomer-dimer equilibrium for the platinated 20mer is revealed by gel electrophoresis. At pH 4.2, addition of a third strand of composition 5'-d(AGCTTTTCTTTTAG) to the ps duplex leads to the formation of a triple helix with two distinct melting points at 38 degreesC (platinum crosslinked Hoogsteen part) and 21 degreesC (Watson-Crick part), respectively.
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https://hal.archives-ouvertes.fr/hal-02075297
Contributor : Laëtitia Legoupil <>
Submitted on : Thursday, March 21, 2019 - 11:53:26 AM
Last modification on : Friday, April 19, 2019 - 3:22:07 PM

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Jens Müller, Markus Drumm, Marc Boudvillain, Marc Leng, Einar Sletten, et al.. Parallel-stranded DNA with Hoogsteen base pairing stabilized by a trans-[Pt(NH3)2]2+ cross-link: characterization and conversion into a homodimer and a triplex. Journal of Biological Inorganic Chemistry, Springer Verlag, 2000, 5 (5), pp.603-611. ⟨10.1007/s007750000143⟩. ⟨hal-02075297⟩

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