title: DNG cytidine: synthesis and binding properties of octameric guanidinium-linked deoxycytidine oligomer.
abstract: The synthesis of guanidinium-linked cytidyl oligomer (DNG-C(8)), a cationic DNA analog, and the corresponding cytidine monomers is described. The DNG monomer synthesis was streamlined to produce a shorter route to the final monomer than previously reported for thymidine and subsequent solid-phase synthesis produced an octameric cytidyl DNG strand. Because octameric deoxyguanosine would be used as the complementary strand in our studies, it was necessary to investigate guanosine self-association. Singular value decomposition was used to mathematically deconvolve the spectral data and confirm the presence of transitions due to DNA-G(8) self-association. Job plots show the binding stoichiometry of DNG-C(8) with DNA-G(8) to be 1:1. Thermal denaturation studies of the DNG-C(8).DNA-G(8) duplex established a T(m) > or = 90 degrees and a DeltaG degree = -13.3 kcal mol(-1), indicating the DNG-C(8).DNA-G(8) duplex is over 1000 times more stable than that of DNA-C(8).DNA-G(8).
authors.affiliation: Department of Chemistry and Biochemistry, University of California-Santa Barbara, Santa Barbara, CA 93106, USA.
authors.forename: Istvan E
authors.initials: IE
authors.lastname: Szabo
authors.forename: Thomas C
authors.initials: TC
authors.lastname: Bruice
mesh_terms: D001665:Binding Sites; D001667:Binding, Competitive; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003562:Cytidine / Q000737:chemistry*; D004247:DNA / Q000138:chemical synthesis* / Q000737:chemistry; D006146:Guanidines / Q000138:chemical synthesis* / Q000737:chemistry; D015394:Molecular Structure; D009690:Nucleic Acid Conformation; D009841:Oligonucleotides / Q000138:chemical synthesis* / Q000737:chemistry; D013696:Temperature; D013816:Thermodynamics
chemical_list: D006146:Guanidines; D009841:Oligonucleotides; C088820:deoxynucleic guanidine; D003562:Cytidine; D004247:DNA