title: [Mechanisms of interaction of tetrahydrocortisol and its complex with apolipoprotein A-I and DNA regulatory cis-elements of CC(GCC)5/GG(CGG)5 type].
abstract: An IR-spectroscopy study of the mechanism of interaction between duplex CC(GCC)5/GG (CGG)5Li2 and tetrahydrocortisol or tetrahydrocortisol-apolipoprotein A-I complex revealed the formation of hydrogen bonds between the OH group of the tetrahydrocortisol A-ring and the C=0 group of cytosine or guanine. Tetrahydrocortisol forms hydrogen bonds with the PO2-group of the duplex and with the OH-group of monosaccharide. The interaction of tetrahydrocortisol and apolipoprotein A-I with the duplex occurs at the same active site, namely, with the C=O-group of bases. The order --> order structural transition takes place in the duplex under the action of tetrahydrocortisol. The order --> disorder structural transition takes place in the duplex under the action of tetrahydrocortisol-apolipoprotein A-I complex.
authors.forename: L E
authors.initials: LE
authors.lastname: Panin
authors.forename: V G
authors.initials: VG
authors.lastname: Kunitsyn
authors.forename: L M
authors.initials: LM
authors.lastname: Poliakov
mesh_terms: D016632:Apolipoprotein A-I / Q000737:chemistry*; D004247:DNA / Q000737:chemistry*; D006860:Hydrogen Bonding; D009692:Nucleic Acid Heteroduplexes / Q000737:chemistry*; D009841:Oligonucleotides / Q000737:chemistry; D011485:Protein Binding; D013055:Spectrophotometry, Infrared; D013760:Tetrahydrocortisol / Q000737:chemistry*
chemical_list: D016632:Apolipoprotein A-I; D009692:Nucleic Acid Heteroduplexes; D009841:Oligonucleotides; D013760:Tetrahydrocortisol; D004247:DNA