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- W2004045793 abstract "It was shown earlier, from database analysis, model building studies, and molecular dynamics simulations that formation of cross-strand bifurcated or Extra Watson-Crick hydrogen (EWC) bonds between successive base pairs may lead to extra rigidity to DNA double helices of certain sequences. The strengths of these hydrogen bonds are debatable, however, as they do not have standard linear geometry criterion. We have therefore carried out detailed ab initio quantum chemical studies using RHF/6-31G(2d,2p) and B3LYP/6-31G(2p,2d) basis sets to determine strengths of several bent hydrogen bonds with different donor and acceptors. Interaction energy calculations, corrected for the basis set superposition errors, suggest that N-H...O type bent EWC hydrogen bonds are possible along same strands or across the strands between successive base pairs, leading to significant stability (ca. 4-9 kcal/mol). The N-H...N and C-H...O type interactions, however, are not so stabilizing. Hence, consideration of EWC N-H...O H-bonds can lead to a better understanding of DNA sequence directed structural features." @default.
- W2004045793 created "2016-06-24" @default.
- W2004045793 creator A5006782201 @default.
- W2004045793 creator A5051389777 @default.
- W2004045793 date "2006-01-01" @default.
- W2004045793 modified "2023-09-26" @default.
- W2004045793 title "Estimation of strength in different extra Watson–Crick hydrogen bonds in DNA double helices through quantum chemical studies" @default.
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- W2004045793 doi "https://doi.org/10.1002/bip.20542" @default.
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