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. 1987 Sep 11;15(17):7027–7044. doi: 10.1093/nar/15.17.7027

alpha-DNA-V. Parallel annealing, handedness and conformation of the duplex of the unnatural alpha-hexadeoxyribonucleotide alpha-[d(CpApTpGpCpG)] with its beta-complement beta-[d(GpTpApCpGpC)] deduced from high field 1H-NMR.

F Morvan 1, B Rayner 1, J L Imbach 1, M Lee 1, J A Hartley 1, D K Chang 1, J W Lown 1
PMCID: PMC306190  PMID: 3658672

Abstract

The beta-complementary hexamer, beta-d[GTACGC], to the alpha-sequence, alpha-d[CATGCG], was synthesized by the phosphotriester method. The non-exchangeable proton assignments were obtained using 1D- and 2D-NMR techniques, including NOE, COSY and NOESY. The beta-strand exists as a random coil at 21 degrees C; however, at 4 degrees C, it forms an antiparallel self-recognition duplex annealing at positions 1-4. The beta-strand was annealed to the alpha-strand, and confirmation of complete annealing was obtained by detection and assignment of the six base pair imino protons in H2O/D2O solution at 21 degrees C. 1D-NOE experiments of the alpha, beta duplex d[alpha-(CATGCG) X beta-(GTACGC)] reveal that (i) it exists in aqueous solution in a conformation that belongs to the B family, (ii) it is 70 +/- 10% right-handed, (iii) the sugar-base orientations of the beta-strand are anti, and the deoxyribose units exist predominantly in the 2'-endo-3'-exo conformation. NOE measurements of the imino proton signals in the alpha, beta duplex reveal that the duplex exhibits parallel polarity.

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Selected References

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