Proton Nuclear Magnetic Resonance Investigations and Ring Current Calculations of Guanine N-1 and Thymine N-3 Hydrogen-Bonded Protons in Double-Helical Deoxyribonucleotides in Aqueous Solution
AUTOR(ES)
Patel, Dinshaw J.
RESUMO
Methods are outlined for assigning the guanine-N1H and thymine-N3H protons to particular base pairs in the proton nuclear magnetic resonance spectra of double-stranded oligodeoxyribonucleotides of known sequence in aqueous solution. Ring current calculations have been used to evaluate the upfield shifts of the guanine-N1H and thymine-N3H protons from the pyrimidine and purine rings of nearest-neighbor base pairs in DNA B-type double-helical structures. Chemical shifts of 13.6 ± 0.1 ppm and 14.6 ± 0.2 ppm are assigned to the guanine-N1H proton of an isolated G·C base pair and the thymine-N3H proton of an isolated A·T base pair, respectively.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=388359Documentos Relacionados
- Nuclear Magnetic Resonance Study of Hydrogen-Bonded Ring Protons in Watson-Crick Base Pairs
- HYDROGEN-BONDED HELICAL CONFIGURATIONS OF POLYNUCLEOTIDES*
- Hydrogen-bonded protons in the tertiary structure of yeast tRNAPhe in solution.
- EXCITED-STATE TWO-PROTON TAUTOMERISM IN HYDROGEN-BONDED N-HETEROCYCLIC BASE PAIRS*
- Evidence for the Presence of Hydrogen-Bonded Secondary Structure in Angiotensin II in Aqueous Solution