title: Guanidiniocarbonyl-pyrrole-aryl conjugates as nucleic acid sensors: switch of binding mode and spectroscopic responses by introducing additional binding sites into the linker.
abstract: Two novel guanidiniocarbonyl pyrrole-pyrene conjugates 3 and 4 as spectroscopic probes for ds-polynucleotides were synthesized and their interaction with different ds-DNAs/RNAs studied. Compared to a previously reported first set of conjugates (1 and 2) the significant extension and increased rigidity of the central part of the structure resulted in a switch of DNA binding mode from intercalative (previously studied derivatives 1 and 2 with a nonbinding and flexible linker) to minor groove binding of the two novel guanidiniocarbonyl-pyrrole-pyrene conjugates 3 and 4. These two compounds interact strongly with ds-DNAs, but only weakly with ds-RNA. The newly incorporated heterocyclic moieties within the central part of the structure of 3 and 4 were able to control by steric and hydrogen-bonding effects the alignment of the molecules within various, structurally different forms of DNA minor grooves, whereby even small differences in the position of the attached pyrene within the groove were reflected in different fluorimetric responses. In addition, 3 and 4 revealed intriguing in vitro selectivity among various human tumour cell lines.
authors.affiliation: Institute for Organic Chemistry, University of Duisburg-Essen, Universitässtrasse 7, 45141, Essen, Germany.
authors.forename: Kathrin
authors.initials: K
authors.lastname: Gröger
authors.forename: Domagoj
authors.initials: D
authors.lastname: Baretić
authors.forename: Ivo
authors.initials: I
authors.lastname: Piantanida
authors.forename: Marko
authors.initials: M
authors.lastname: Marjanović
authors.forename: Marijeta
authors.initials: M
authors.lastname: Kralj
authors.forename: Marina
authors.initials: M
authors.lastname: Grabar
authors.forename: Sanja
authors.initials: S
authors.lastname: Tomić
authors.forename: Carsten
authors.initials: C
authors.lastname: Schmuck
mesh_terms: D045744:Cell Line, Tumor; D002942:Circular Dichroism; D004247:DNA / Q000737:chemistry*; D006801:Humans; D008958:Models, Molecular; D009690:Nucleic Acid Conformation; D011758:Pyrroles / Q000737:chemistry*; D012313:RNA / Q000737:chemistry*; D012996:Solutions / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013696:Temperature
chemical_list: D011758:Pyrroles; D012996:Solutions; D012313:RNA; D004247:DNA