title: Biophysical studies of the complexes of polyriboguanylic acid with brominated and chlorinated polyribocytidylic acids.
abstract: Conformation of double-stranded complexes of polyriboguanylic acid with halogenated polyribocytidylic acid [poly(C)] was studied with the aid of differential pulse polarography, terbium fluorescence and circular dichroism spectrometry. It was shown that halogenation at C(5) of cytosine residues in poly(C) disturbed the ordered structure of the double-helical complex. In addition, this halogenation does not improve antiviral activity of the polynucleotide complex studied in the system of vesicular stomatitis virus and the cell culture of chicken embryos. It was concluded that the regularity of the secondary structure of synthetic RNAs might play an important role in the mechanism of biological activity of these biomacromolecules.
authors.affiliation: Institute of Macromolecular Compounds, Academy of Sciences of the USSR, Leningrad.
authors.forename: E M
authors.initials: EM
authors.lastname: Kogan
authors.forename: N G
authors.initials: NG
authors.lastname: Dyatlova
authors.forename: N S
authors.initials: NS
authors.lastname: Sidorova
authors.forename: L M
authors.initials: LM
authors.lastname: Vilner
authors.forename: O
authors.initials: O
authors.lastname: Vrána
authors.forename: V
authors.initials: V
authors.lastname: Brabec
mesh_terms: D055592:Biophysical Phenomena; D001703:Biophysics; D001966:Bromine / Q000737:chemistry*; D002713:Chlorine / Q000737:chemistry*; D002942:Circular Dichroism; D005454:Fluorescence Polarization; D009690:Nucleic Acid Conformation; D011066:Poly C / Q000737:chemistry*; D011068:Poly G / Q000737:chemistry*; D012330:RNA, Double-Stranded / Q000737:chemistry*
chemical_list: D012330:RNA, Double-Stranded; D011068:Poly G; D011066:Poly C; D002713:Chlorine; D001966:Bromine