MUNZAROVÁ, Markéta a Vladimír SKLENÁŘ. A DFT Analysis of NMR Scalar Interactions Across the Glycosidic Bond in DNA. Journal of the American Chemical Society. Washington, D.C.: American Chemical Society, 2003, roč. 125, č. 12, s. 3649-3658. ISSN 0002-7863.
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Základní údaje
Originální název A DFT Analysis of NMR Scalar Interactions Across the Glycosidic Bond in DNA
Autoři MUNZAROVÁ, Markéta (203 Česká republika) a Vladimír SKLENÁŘ (203 Česká republika, garant).
Vydání Journal of the American Chemical Society, Washington, D.C. American Chemical Society, 2003, 0002-7863.
Další údaje
Originální jazyk angličtina
Typ výsledku Článek v odborném periodiku
Obor 10403 Physical chemistry
Stát vydavatele Česká republika
Utajení není předmětem státního či obchodního tajemství
Impakt faktor Impact factor: 6.516
Kód RIV RIV/00216224:14310/03:00008630
Organizační jednotka Přírodovědecká fakulta
Klíčová slova anglicky NUCLEIC-ACIDS; CONSTANTS; OLIGONUCLEOTIDES; NMR
Štítky CONSTANTS, NMR, NUCLEIC-ACIDS, Oligonucleotides
Změnil Změnil: prof. RNDr. Vladimír Sklenář, DrSc., učo 2611. Změněno: 20. 6. 2008 12:55.
Anotace
Abstract. The relationship between the glycosidic torsion angle c, the three-bond couplings 3JC2/4-H1' and 3JC6/8-H1', and the one-bond coupling 1JC1'-H1' in deoxyribonucleosides and a number of uracil cyclo-nucleosides has been analyzed using density functional theory. The influence of the sugar pucker and the hydroxymethyl conformation has also been considered. The parameters of the Karplus relationships between the three-bond couplings and c depend strongly on the aromatic base. 3JC2/4-H1' reveals different behavior for deoxyadenosine, deoxyguanosine, and deoxycytidine as compared to deoxythymidine and deoxyuridine. In the case of 3JC6/8-H1', an opposite trans to cis ratio of couplings is obtained for pyrimidine nucleosides in contrast to purine nucleosides. The extremes of the Karplus curves are shifted by ca. 10o with respect to syn and anti-periplanar orientations of the coupled nuclei. The change in the sugar pucker from S to N decreases 3JC2/4-H1' and 3JC6/8-H1' while increasing 1JC1'-H1' for the syn rotamers, whereas all of the trends are reversed for the anti rotamers. The influence of the sugar pucker on 1JC1'-H1' is interpreted in terms of interactions between the nO4', sigma C1'-H1' orbitals. The 1JC1'-H1' are related to chi through a generalized Karplus relationship, which combines cos(chi) and cos2(chi) functions with mutually different phase shifts that implicitly accounts for a significant portion of the related sugar pucker effects. Most of theoretical 3JC2/4-H1' and 3JC6/8-H1' for uracil cyclo-nucleosides compare well with available experimental data. 3JC6/8-H1' couplings for all C2-bridged nucleosides are up to 3 Hz smaller than in the genuine nucleosides with the corresponding chi, revealing a non-local aspect of the spin-spin interactions across the glycosidic bond. Theoretical 1JC1'-H1' are underestimated with respect to the experiment by ca. 10% but reproduce the trends in 1JC1'-H1' vs. chi.
Návaznosti
LN00A016, projekt VaVNázev: BIOMOLEKULÁRNÍ CENTRUM
Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Biomolekulární centrum
VytisknoutZobrazeno: 26. 2. 2024 09:17