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. 1989 Apr 11;17(7):2693–2704. doi: 10.1093/nar/17.7.2693

Alpha-DNA VIII: thermodynamic parameters of complexes formed between the oligo-alpha-deoxynucleotides: alpha-d(GGAAGG) and alpha-d(CCTTCC) and their complementary oligo-beta-deoxynucleotides: beta-d(CCTTCC) and beta-d(GGAAGG) are different.

J Paoletti 1, D Bazile 1, F Morvan 1, J L Imbach 1, C Paoletti 1
PMCID: PMC317651  PMID: 2717407

Abstract

The temperature dependence of the formation of a complex between an alpha-d(CCTTCC) hexanucleotide and its complementary beta-d(GGAAGG) sequence was studied and compared to the formation of the beta-d(CCTTCC):beta-d(GGAAGG) complex. Such alpha-beta complex is more stable than the regular beta:beta complex. The Tm value for the alpha:beta complex is 28 degrees C (delta G degrees = -7.3 kcal/mole) while Tm = 20, 1 degree C (delta G degrees = -6.3 kcal/mole) for the beta:beta complex. The stoechiometry of the alpha:beta complex corresponds to the formation of a 1:1 duplex. However, when the alpha- strand is made of alpha-purines: alpha-d(GGAAGG), the stability of the alpha:beta complex, alpha-d(GGAAGG):beta-d(CCTTCC) is found to be lower (Tm = 13.8 degrees C) than the stability of the regular beta-beta complex, leading to the conclusion that the nature of the alpha-sequence is important in terms of stability when considering the synthesis of such a sequence for using it as antisense oligonucleotide.

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Selected References

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