Abstract
The local structure of two self complementary oligonucleotides d(GTAC-GTAC) and d(GTACGUAC) which differ only by the presence of uracil, not a normal component of DNA, have been investigated by 1H NMR at 500 MHz. The two octamers exhibit the same thermodynamical constants (t 1/2, delta H), their exchangeable protons broaden and disappear at the same temperature. The T-U substitution did not induce any significant changes on non exchangeable protons resonances from 2-D COSY and 2-D NOESY experiments. So the two octamers exhibit the same global structure. The only variation was detected by 1D NOE measurements: the base orientations around the N glycosidic bonds (chi angles) are different.
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