title: Data on secondary structures and ligand interactions of G-rich oligonucleotides that defy the classical formula for G4 motifs.
abstract: The data provided in this article are related to the research article "The expanding repertoire of G4 DNA structures" [1]. Secondary structures of G-rich oligonucleotides (ONs) that represent "imperfect" G-quadruplex (G4) motifs, i.e., contain truncated or interrupted G-runs, were analyzed by optical methods. Presented data on ON structures include circular dichroism (CD) spectra, thermal difference spectra (TDS) and UV -melting curves of the ONs; and rotational relaxation times (RRT) of ethidium bromide (EtBr) complexes with the ONs. TDS, CD spectra and UV-melting curves can be used to characterize the topologies and thermal stabilities of the ON structures. RRTs are roughly proportional to the hydrodynamic volumes of the complexes and thus can be used to distinguish between inter- and intramolecular ON structures. Presented data on ON interactions with small molecules include fluorescence emission spectra of the G4 sensor thioflavin T (ThT) in complexes with the ONs, and CD-melting curves of the ONs in the presence of G4-stabilizing ligands N-methylmesoporphyrin IX (NMM) and pyridostatin (PDS). These data should be useful for comparative analyses of classical G4s and "defective"G4s, such as quadruplexes with vacancies or bulges.
authors.affiliation: Research and Clinical Center for Physical Chemical Medicine, 119435 Moscow, Russia; Moscow Institute of Physics and Technology (State University), 117303 Moscow, Russia.
authors.forename: Maria
authors.initials: M
authors.lastname: Vlasenok
authors.affiliation: Research and Clinical Center for Physical Chemical Medicine, 119435 Moscow, Russia; Engenlhardt Institute of Molecular Biology, 119991 Moscow, Russia.
authors.forename: Anna
authors.initials: A
authors.lastname: Varizhuk
authors.affiliation: Engenlhardt Institute of Molecular Biology, 119991 Moscow, Russia.
authors.forename: Dmitry
authors.initials: D
authors.lastname: Kaluzhny
authors.affiliation: Research and Clinical Center for Physical Chemical Medicine, 119435 Moscow, Russia.
authors.forename: Igor
authors.initials: I
authors.lastname: Smirnov
authors.affiliation: Research and Clinical Center for Physical Chemical Medicine, 119435 Moscow, Russia.
authors.forename: Galina
authors.initials: G
authors.lastname: Pozmogova
keywords: G-quadruplexes; G4 ligands; G4 motifs; Thermal stability