Abstract
The two deoxyribonucleotides [d(CpGpApTpCpG)]2 and [d(CpGpCpG)]2 were synthesized by the phosphotriester method. Their duplex form under the conditions of the 1H-nmr experiments was proven by end 32P labeling with T4 polynucleotide kinase followed by butt end joining employing the absolute specificity of T4 ligase for double stranded DNA and analysis using gel electrophoresis and autoradiography. Complete nmr assignment of the 1H chemical shifts and coupling constants was achieved. The assignments were secured using sequential decoupling, NOE difference measurements, and two-dimensional COSY and SECSY experiments. Spectrum simulation confirmed the experimental values of chemical shifts and coupling constants. The techniques for the assignment outlined together with 31P and 2-D heteronuclear shift correlation permit an approach to a systematic analysis of more complex single-strand and duplex oligodeoxyribonucleotides.
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