title: A structure-function study of nucleic acid-fluorenone complexes.
abstract: Several 2.7-bis-[(dialkylamino)-acetylamino]-fluoren-9-one derivatives (fluoramides) were synthesized as analogues of the DNA binding compound tilorone (2,7-bis[(diethylamino)-ethoxy]-fluoren-9-one). Previous studies showed the drugs to induce cytokines and inhibit reverse transcription. Here, their binding to DNA was evaluated using UV and circular dichroism studies. Like tilorone, the fluoramides derivatives also intercalate resulting in increased Tm values and new CD signatures. A preference to alternating A-T and G-C sequences was detected; only minor interaction to homologous sequences was observed. Moreover, no upper limit in the drug/DNA ratio was found, testing limit being the precipitation of the drug. However, surface plasmon resonance (SPR) studies of tilorone and 2,7-bis-[(dipropylamino)-acetyl-amino]-fluoren-9-one, indicate an astonishing drug/base pair ratio (r > 1), which point to a multitude of interactions under SPR conditions. Molecular modeling calculations, where the geometries of the complexes optimized under the assumption of intercalative and multitude of suprahelical arrangements, rationalize the observations. Based on the thermodynamic and biological studies, a structure-function model is proposed.
authors.affiliation: Martin Luther University Halle-Wittenberg, Department of Biochemistry, Saale, Germany. bischoff@biochemtech.uni-halle.de
authors.forename: G
authors.initials: G
authors.lastname: Bischoff
authors.forename: U
authors.initials: U
authors.lastname: Gromann
authors.forename: S
authors.initials: S
authors.lastname: Lindau
authors.forename: R
authors.initials: R
authors.lastname: Skölziger
authors.forename: W
authors.initials: W
authors.lastname: Witkowski
authors.forename: C
authors.initials: C
authors.lastname: Bohley
authors.forename: S
authors.initials: S
authors.lastname: Naumann
authors.forename: J
authors.initials: J
authors.lastname: Sági
authors.forename: W V
authors.initials: WV
authors.lastname: Meister
authors.forename: S
authors.initials: S
authors.lastname: Hoffmann
mesh_terms: D000818:Animals; D002417:Cattle; D002942:Circular Dichroism; D003198:Computer Simulation; D004247:DNA / Q000378:metabolism*; D005449:Fluorenes / Q000737:chemistry*; D008024:Ligands; D008956:Models, Chemical; D008958:Models, Molecular; D009696:Nucleic Acids / Q000737:chemistry*; D013053:Spectrophotometry; D013329:Structure-Activity Relationship; D020349:Surface Plasmon Resonance; D013816:Thermodynamics; D013950:Thymus Gland / Q000378:metabolism; D014466:Ultraviolet Rays
chemical_list: D005449:Fluorenes; D008024:Ligands; D009696:Nucleic Acids; D004247:DNA