Gaffney BL, Marky LA, Jones RA. The influence of the purine 2-amino group on DNA conformation and stability. Synthesis and conformational analysis of d[T(2-aminoA)]3.
Nucleic Acids Res 1982;
10:4351-61. [PMID:
7122239 PMCID:
PMC320804 DOI:
10.1093/nar/10.14.4351]
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Abstract
A self-complementary hexanucleotide consisting of thymidine and 2-amino-deoxyadenosine, d(TA')3, has been synthesized by a solid phase phosphotriester method. Melting studies show that the additional hydrogen bond afforded by the 2-amino group substantially stabilizes the duplex. Moreover, conformational analysis using circular dichroism shows that a salt-induced conformational transition occurs, similar to the B leads to Z transition observed for d(CG)n oligonucleotides.
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