title: Protonated polynucleotide structures. 18. Interaction of oligocytidylates with poly (G).
abstract: The faculty for and degree of oligo(C)-poly(G) interaction is described as an essentially chain length - sensitive phenomenon. At neutral pH under suitable experimental conditions, oligocytidylates of chain length greater than four associate with poly(G) to form double-stranded structures, as does poly(C). The extent of complex formation increases with degree of polymerization. The complex at acid pH is shown to be triple-stranded, of stoicheometry 2C/1G. The observation of a 2G/1C artifact is discussed.
mesh_terms: D001665:Binding Sites; D002942:Circular Dichroism; D003597:Cytosine Nucleotides; D008970:Molecular Weight; D009690:Nucleic Acid Conformation; D009841:Oligonucleotides; D009843:Oligoribonucleotides; D011068:Poly G; D011131:Polyribonucleotides; D013056:Spectrophotometry, Ultraviolet; D013329:Structure-Activity Relationship
chemical_list: D003597:Cytosine Nucleotides; D009841:Oligonucleotides; D009843:Oligoribonucleotides; D011131:Polyribonucleotides; D011068:Poly G