title: [The use of phase diagrams in the crystallization of oligonucleotide duplexes. I. A model of crystallization of the (pGpT)n.(pApC)n + spermine system].
abstract: A set of experimental phase diagrams revealing the region of existence of microcrystals in mixture "(pGpT)n.(pApC)n+spermine", n = 2,3,4, was obtained. All diagrams are wedge-like with the slope of the upper branch and the level of the lower one depending on the oligonucleotidd length. The presence of MPD, MgCl2 and NaCl changes the form of the diagrams in a different manner. A model explaining the peculiar features of the diagrams for mixture "oligonucleotide duplex+spermine" is proposed. The analysis of the diagrams was carried out on the basis of this model and the values of the binding constants for binding of spermine and Mg2+ to duplexes were estimated. Some conclusions about the types of complexes, which may form microcrystals in different regions of diagrams were made.
mesh_terms: D001665:Binding Sites; D003460:Crystallization; D006018:Glycols / Q000494:pharmacology; D046911:Macromolecular Substances; D008274:Magnesium / Q000494:pharmacology; D015636:Magnesium Chloride; D008956:Models, Chemical; D009690:Nucleic Acid Conformation; D009838:Oligodeoxyribonucleotides; D011131:Polyribonucleotides; D012965:Sodium Chloride / Q000494:pharmacology; D013096:Spermine
chemical_list: D006018:Glycols; D046911:Macromolecular Substances; D009838:Oligodeoxyribonucleotides; D011131:Polyribonucleotides; D015636:Magnesium Chloride; D013096:Spermine; D012965:Sodium Chloride; D008274:Magnesium; C011480:hexylene glycol
vernacular_title: Ispol'zovanie fazovykh diagramm pri kristallizatsii oligonukleotidnykh dupleksov. I. Modelirovanie povedeniia kristallizatsionnoĭ sistemy "(pGpT)n.(pApC)n + spermin".