Nucleic Acids Research, Vol 26, Issue 14 3350-3357, Copyright © 1998 by Oxford University Press
G Balow, V Mohan, EA Lesnik, JF Johnston, BP Monia and OL Acevedo
The synthesis of 7-propynyl-, 7-iodo- and 7-cyano-7-deaza-2-amino-2'-
deoxyadenosines is described. The nucleosides were synthesized,
functionalized into the phosphoramidites and incorporated into
oligodeoxynucleotides. Spectroscopic melting experiments against
complementary RNA showed increases of 3-4 degreesC per modification for
single substitutions and smaller increases per incorporation for multiple
substitutions relative to unmodified control sequences. The 7- propyne and
7-iodo nucleosides were incorporated into antisense sequences targeting the
3'-UTR of murine C- raf mRNA. Both nucleosides demonstrated
substitution-dependent potency. The sequences with three and four
substitutions of the 7-propyne-7-deaza-2-amino-2'- deoxyadenosine exhibited
a 2-3-fold increase in potency over unmodifed controls.
ARTICLES
Biophysical and antisense properties of oligodeoxynucleotides containing 7-propynyl-, 7-iodo- and 7-cyano-7-deaza-2-amino-2'- deoxyadenosines
Department of Medicinal Chemistry and Antisense Biology, Isis Pharmaceuticals Inc., Carlsbad, CA 92008, USA.
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