title: New sequential-assignment routes of nucleic acid NMR signals using a [5'-(13)C]-labeled DNA dodecamer.
abstract: NMR signal assignments for DNA oligomers have been performed by the well-established sequential assignment procedures based on NOESY and COSY. The H4'/H5'/H5'' resonance region is congested and difficult to analyze without the use of isotope-labeled DNA oligomers. Here a DNA dodecamer constructed with 2'-deoxy[5'-(13)C]ribonucleotides, 5'-d(*C*G*C*G*A*A*T*T*C*G*CG)-3' (*N = [5'-(13)C]Nucleotide), was prepared in an effort to analyze the H4'/H5'/H5'' resonance region by 2D 1H-13C HMQC-NOESY. In the C5' and H1' resonance region, weak and strong cross peaks for C5'(i)-H1'(i) and C5'(i)-H1'(i-1), respectively, were found, thus enabling the sequential assignment within this region. A similar sequential assignment route was found between C5' and H2''. Proton pair distances evaluated from the canonical B-DNA as well as A-DNA indicated that these sequential-assignment routes on a 2D 1H-13C HMQC-NOESY spectrum work for most nucleic acid stem regions.
authors.affiliation: School of Pharmacy, Tokyo University of Pharmacy and Life Science, Horinouchi, Hachioji, Tokyo, Japan. kawasima@ps.toyaku.ac.jp
authors.forename: Etsuko
authors.initials: E
authors.lastname: Kawashima
authors.forename: Takeshi
authors.initials: T
authors.lastname: Sekine
authors.forename: Kaoru
authors.initials: K
authors.lastname: Umabe
authors.forename: Kazuo
authors.initials: K
authors.lastname: Kamaike
authors.forename: Toshimi
authors.initials: T
authors.lastname: Mizukoshi
authors.forename: Nobuhisa
authors.initials: N
authors.lastname: Shimba
authors.forename: Ei-ichiro
authors.initials: E
authors.lastname: Suzuki
authors.forename: Chojiro
authors.initials: C
authors.lastname: Kojima
mesh_terms: D002247:Carbon Isotopes; D004247:DNA / Q000032:analysis; D009682:Magnetic Resonance Spectroscopy; D009838:Oligodeoxyribonucleotides / Q000737:chemistry*
chemical_list: D002247:Carbon Isotopes; D009838:Oligodeoxyribonucleotides; D004247:DNA