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• W2012190608 abstract "The ruthenium complex [Ru(phen)2(dppz)]2+ (where phen is phenanthroline and dppz dipyridophenazine is known as a ‘light switch’ complex because its luminescence in solution is significantly enhanced in the presence of DNA. This property is poised to serve in diagnostic and therapeutic applications, but its binding mode with DNA needs to be elucidated further. Here, we describe the crystal structures of the Λ enantiomer bound to two oligonucleotide duplexes. The dppz ligand intercalates symmetrically and perpendicularly from the minor groove of the d(CCGGTACCGG)2 duplex at the central TA/TA step, but not at the central AT/AT step of d(CCGGATCCGG)2. In both structures, however, a second ruthenium complex links the duplexes through the combination of a shallower angled intercalation into the C1C2/G9G10 step at the end of the duplex, and semi-intercalation into the G3G4 step of an adjacent duplex. The TA/TA specificity of the perpendicular intercalation arises from the packing of phenanthroline ligands against the adenosine residue. Elucidating how small molecules bind to DNA is crucial to bio-sensing and therapy applications. Two crystal structures now show the binding modes of a ‘light switch’ ruthenium complex — whose luminescence in solution increases in the presence of DNA — with oligonucleotide duplexes containing either TA/TA or AT/AT central steps, revealing a specific intercalation mode with the TA/TA species." @default.
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• W2012190608 date "2012-06-24" @default.
• W2012190608 modified "2023-10-14" @default.
• W2012190608 title "Crystal structures of Λ-[Ru(phen)2dppz]2+ with oligonucleotides containing TA/TA and AT/AT steps show two intercalation modes" @default.
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• W2012190608 doi "https://doi.org/10.1038/nchem.1397" @default.
• W2012190608 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22824893" @default.
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