Alternating d(G-C)3and d(C-G)3hexanucleotides containing 7-deaza-2'-deoxyguanosine or 8-aza-7-deaza-2'-deoxyguanosine in place of dG
Open Access
- 11 February 1989
- journal article
- research article
- Published by Oxford University Press (OUP) in Nucleic Acids Research
- Vol. 17 (3) , 901-910
- https://doi.org/10.1093/nar/17.3.901
Abstract
The synthesis of alternating hexamers (8–13) derived from d(C-G)3 or d(G-C)3 but containing c7z8Gd (2) or c7Gd [3) instead of dG is described employing phosphoramidite-chemistry. Apart from the isobutyryl group the dimethyiaminomethylene residue was used for the nucleobase-protection of 3. The methyl- and the cyanoethyl-phosphoramidites of 3 (5a-c) were synthesized. They were employed together with those of c7G or c7z8Gd [12] in automated oligonucleotide synthesis. Tm-values as well as thermodynamic data of the oligomers 9, I0, 12, and 13 indicated that duplexes were destabilized if c7Gd replaced dG, whereas c7z8Gd stabilized the duplex structure. In contrast to d(C-G)3 which underwent salt-dependent B-Z transition, CD-spectra of oligomers containing c7Gd or c7z8Gd in place of dG showed retained B-conformation.This publication has 14 references indexed in Scilit:
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