Journal
JOURNAL OF BIOMOLECULAR NMR
Volume 19, Issue 4, Pages 361-365Publisher
KLUWER ACADEMIC PUBL
DOI: 10.1023/A:1011250219293
Keywords
Dickerson dodecamer; dipolar coupling; E.COSY; hydrogen bond; liquid crystal; Watson-Crick
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The ratio of the internucleotide dipolar coupling and the corresponding one-bond imino N-15-H-1 dipolar coupling provides a measure for the N . . .H/H-N distance ratio. Measurements were carried out for a dodecamer, d(CGCGAATTCGCG)(2), in which a C-G and an A-T basepair were uniformly enriched in N-15. When assuming H-bonds to be perfectly linear, dipolar data indicate time-averaged hydrogen bond lengths of 1.80 +/-0.03 Angstrom for A-T and 1.86 +/-0.02 Angstrom for C-G. When using H-bond orientations from high resolution X-ray data, H-bond lengths are about 0.1 Angstrom shorter.
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