S. Agrawal et al., EFFECT OF G-RICH SEQUENCES ON THE SYNTHESIS, PURIFICATION, HYBRIDIZATION, CELL UPTAKE, AND HEMOLYTIC-ACTIVITY OF OLIGONUCLEOTIDES, Bioorganic & medicinal chemistry letters, 6(18), 1996, pp. 2219-2224
We designed G-rich oligonucleotides in which the position and length o
f the guanosine residues were modified and studied the effects of thes
e contiguous guanosine residues on the synthesis, purification, hybrid
ization, cell uptake, and hemolytic effect of oligonucleotides. Our re
sults revealed that the hyperstructure formation of these oligonucleot
ides depended on the length and position of the guanosine residues and
the flanking sequences. The phosphorothioate oligonucleotides formed
much less hyperstructures than their phosphodiester counterpart. These
hyperstructures were more stable towards nucleases, were taken up by
cells efficiently, and showed pronounced polyanionic related side-effe
cts. Copyright (C) 1996 Elsevier Science Ltd