Exonuclease-resistant oligonucleotides
First Claim
1. An oligonucleotide resistant to degradation under physiological conditions, which oligonucleotide is a modified form of an oligonucleotide consisting essentially of nucleosides linked through phosphodiester linkages so that said phosphodiester linkages at the 3'"'"' terminus, or the 5'"'"' terminus, or both the 3'"'"' and 5'"'"' termini are replaced with N-substituted phosphoramidate linkages, the number of said replaced linkages being 1 to 10, wherein the phosphoramidate has the formula:
- ##STR14## wherein R1 and R2 are independently selected from the group consisting of hydrogen, hydrocarbyl substituents of 20 carbon atoms or less, and oxyhydrocarbyl substituents of 20 carbon atoms or less containing 1 to 3 oxy groups, and wherein said hydrocarbyl or oxyhydrocarbyl substituents are linear or branched alkyl of 1 to 20 carbon atoms, linear or branched alkenyl of 2 to 20 carbon atoms, cycloalkyl or cycloalkenyl of 3 to 20 carbon atoms, linear or branched alkoxy of 1 to 20 carbon atoms, or aryl of 6 to 18 carbon atoms, provided that R1 and R2 are not both hydrogens.
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0 Petitions
Accused Products
Abstract
A method is provided for making 3'"'"' and/or 5'"'"' end-capped oligonucleotides so as to render the oligonucleotide resistant to degradation by exonucleases. The exonuclease degradation resistance is provided by incorporating two or more phosphoramidate and phosphorocmonothioate and/or phosphorodithioate linkages at the 5'"'"' and/or 3'"'"' ends of the oligonucleotide, wherein the number of phosphoramidate linkages is less than a number which would interfere with hybridization to a complementary oligonucleotide strand and/or which would interfere with RNAseH activity when the oligonucleotide is hybridized to RNA.
473 Citations
20 Claims
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1. An oligonucleotide resistant to degradation under physiological conditions, which oligonucleotide is a modified form of an oligonucleotide consisting essentially of nucleosides linked through phosphodiester linkages so that said phosphodiester linkages at the 3'"'"' terminus, or the 5'"'"' terminus, or both the 3'"'"' and 5'"'"' termini are replaced with N-substituted phosphoramidate linkages, the number of said replaced linkages being 1 to 10, wherein the phosphoramidate has the formula:
- ##STR14## wherein R1 and R2 are independently selected from the group consisting of hydrogen, hydrocarbyl substituents of 20 carbon atoms or less, and oxyhydrocarbyl substituents of 20 carbon atoms or less containing 1 to 3 oxy groups, and wherein said hydrocarbyl or oxyhydrocarbyl substituents are linear or branched alkyl of 1 to 20 carbon atoms, linear or branched alkenyl of 2 to 20 carbon atoms, cycloalkyl or cycloalkenyl of 3 to 20 carbon atoms, linear or branched alkoxy of 1 to 20 carbon atoms, or aryl of 6 to 18 carbon atoms, provided that R1 and R2 are not both hydrogens.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. The oligonucleotide having the formula selected from the group consisting of:
- ##STR15## wherein each n, m, i, j and s is independently an integer and each s is in the range of about 2 to 10;
each n and m is independently from 1 to about 50;
s+n in formulas I and II is less than 100; and
s+s+m in formula is less than 100;
each i varies from 1 to n;
each j varies from 1 to m;
T is hydrogen or a hydroxyl-protecting group;
R1 and R2 are independently selected from the group consisting of hydrogen, hydrocarbyl substituents of 20 carbon atoms or less, and oxyhydrocarbyl substituents of 20 carbon atoms or less containing 1 to 3 oxy groups, and wherein said hydrocarbyl or oxyhydrocarbyl substituents are linear or branched alkyl of 1 to 20 carbon atoms, linear or branched alkenyl of 2 to 20 carbon atoms, cycloalky or cycloalkenyl of 3 to 20 carbon atoms, linear or branched alkoxy of 1 to 20 carbon atoms, or aryl of 6 to 18 carbon atoms, with the proviso that R1 to R2 are not both hydrogen,each B is independently a protected or unprotected heterocyclic base; each Xi and Xj is independently O or S; and each Yi and Yj is independently R, --SR or --OR, where R is as defined for R1 and R2. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
- ##STR15## wherein each n, m, i, j and s is independently an integer and each s is in the range of about 2 to 10;
Specification