title: [Structure of an oligonucleotide of bleomycin A5 from 13C-NMR data].
abstract: The localization of the covalent bond in the conjugates of bleomycin A5 and oligonucleotides was established by 13C NMR using the bleomycin derivative of uridine-5'-phosphate synthesized as a model compound. The phosphate group of the nucleotide was shown to form a phosphamide bond with the primary amino group of the spermidine moiety of bleomycin A5. The formation of the P-N bond causes the downfield shift of the signals of the neighboring carbon atoms of the spermidine fragment by 1.8 and 4.2 ppm and the splitting of the signal of the C-2 atom of the spermidine fragment with J 6.8 Hz due to vicinal spin-spin coupling with the phosphorous atom.
authors.forename: D S
authors.initials: DS
authors.lastname: Sergeev
authors.forename: A Iu
authors.initials: AIu
authors.lastname: Denisov
authors.forename: V F
authors.initials: VF
authors.lastname: Zarytova
mesh_terms: D001761:Bleomycin / Q000031:analogs & derivatives* / Q000737:chemistry; D002247:Carbon Isotopes; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D013095:Spermidine / Q000737:chemistry; D013113:Spin Labels; D014542:Uridine Monophosphate / Q000737:chemistry*
chemical_list: D002247:Carbon Isotopes; D013113:Spin Labels; D001761:Bleomycin; C025703:bleomycetin; D014542:Uridine Monophosphate; D013095:Spermidine
vernacular_title: Struktura oligonukleotidnogo proizvodnogo bleomitsina A5 po dannym spektroskopii 13C-IaMR.