title: Structural studies of oligonucleotides containing G-quadruplex motifs using AFM.
abstract: G-quadruplex DNAs are cyclic arrays of four guanine bases binding by Hoogsteen hydrogen bonds, found in the telomeric regions of chromosomes and in transcriptional regulatory regions of several important oncogenes. Here, we used high resolution atomic force microscopy (AFM) to observe a specific guanine (G) tetrad mediated complex formation of oligonucleotides containing a G-quadruplex motifs (G-ODN) combined with a palindromic sequence under physiological extracellular conditions. These oligonucleotides have been investigated in correlation to their immunostimulatory effects. We observed structural dependence on ion concentration and G-ODN concentration, where high concentration self-assembled DNA networks were formed.
authors.affiliation: Department of Geo- and Environment Sciences, LMU, Munich 80333, Germany.
authors.forename: L T
authors.initials: LT
authors.lastname: Costa
authors.forename: M
authors.initials: M
authors.lastname: Kerkmann
authors.forename: G
authors.initials: G
authors.lastname: Hartmann
authors.forename: S
authors.initials: S
authors.lastname: Endres
authors.forename: P M
authors.initials: PM
authors.lastname: Bisch
authors.forename: W M
authors.initials: WM
authors.lastname: Heckl
authors.forename: S
authors.initials: S
authors.lastname: Thalhammer
mesh_terms: D000276:Adjuvants, Immunologic / Q000737:chemistry / Q000494:pharmacology; D001483:Base Sequence; D006801:Humans; D006860:Hydrogen Bonding; D066298:In Vitro Techniques; D018625:Microscopy, Atomic Force; D036103:Nanotechnology; D009690:Nucleic Acid Conformation; D009838:Oligodeoxyribonucleotides / Q000737:chemistry* / Q000494:pharmacology
chemical_list: D000276:Adjuvants, Immunologic; D009838:Oligodeoxyribonucleotides