title: [Nuclear magnetic resonance study of the conformation in nucleotides, oligonucleotides, and their analogs. I. Conformation of adenosine-3',5'-cyclic phosphate and its analogs in aqueous solutions].
abstract: Conformation in aqueous solution of adenosine-3',5'-cyclophosphate, 8-(beta-aminoethylamino) adenosine-3',5'-cyclophosphate, 8-(beta-oxiethylamino) adenosine-3',5'-cyclophosphate, 8-(carboxymethylamino) adenosine-3',5'-cyclophosphate and their non-cyclic analogs has been studied by NMR spectroscopy. The conformational situation in the model of dynamic equilibrium of sin- and anti-states has been described on the basis of spinlattice relaxation times and temperature dependences of chemical shifts. Adenosine-3',5'-cyclophosphate has been demonstrated to exist mainly in anti-conformation while 8-substituted analogs -- in sin-conformation. Equilibrium constants have been calculated for the compounds under study.
mesh_terms: D000242:Cyclic AMP / Q000031:analogs & derivatives*; D009682:Magnetic Resonance Spectroscopy; D008433:Mathematics; D008968:Molecular Conformation; D013329:Structure-Activity Relationship; D013696:Temperature
chemical_list: D000242:Cyclic AMP
vernacular_title: Izuchenie metodom iadernogo magnitnogo rezonansa konformatsii Nukleotidov, oligonukleotidov i ikh analogov v rastvore. I. Konformatsiia a denozin-3', 5'-tsiklofosfata i ego analogov v vodnykh rastuorakh.