2’-Ome-rna phosphoramidites

Glen Research 2’-OMe-RNA CE (ß-cyanoethyl) Phosphoramidites are designed to produce synthetic oligonucleotides containing nuclease resistant 2’-O-methyl ribonucleotide linkages. Deprotection, isolation and handling of 2’-O-methyl oligonucleotides are identical to the procedures for oligodeoxynucleotides.

HT 2’-OMe-RNA Phosphoramidites

UltraMild 2’-OMe-RNA

The use of UltraMild monomers in oligonucleotide synthesis has allowed very sensitive dyes like TAMRA, HEX and Cy5 to be used virtually routinely. The DNA and RNA monomers are currently available and we also provide this set of 2’-OMe-RNA monomers. In our version of this chemistry, we use as protecting groups phenoxyacetyl (Pac) for A, acetyl (Ac) for C, and isopropyl-phenoxyacetyl (iPr-Pac) for G.

It has become clear that acetic anhydride in the conventional capping mix can cause transamidation in situations where an amine protecting group is quite labile. This leads to acetyl protection on the amino group that may be slow to be removed. Consequently, if many dG residues are included in the oligonucleotide, we recommend the use of phenoxyacetic anhydride (Pac2O) in Cap A. This modification removes the possibility of exchange of the iPr-Pac protecting group on the dG with acetate from the acetic anhydride capping mix

2’-Ome-rna supports

ABI-style columns are supplied for 1 µmole and 0.2 µmole scales unless otherwise requested (see note box).

minor 2’-Ome-rna phosphoramidites

To aid in the evaluation of the structures of 2’-OMe-RNA complexes, we offer the CE phosphoramidites listed below. 2’-OMe-T is useful in triplex studies while the 2-aminopurine derivative may be tested in ribozyme studies. By supporting an additional hydrogen bond, 2,6-diaminopurine (2-amino-adenosine) binds more strongly with uridine than does adenosine. Oligonucleotides containing 2’-OMe-5-Me-C and 2’-OMe-I would be of interest to researchers involved in triplex and antisense studies using 2’-OMe-RNA. The uses of 2’-OMe-5-bromo-U phosphoramidite range from crystallographic studies due to the heavy atom to cross-linking because of its photolability. 5-Fluoro-pyrimidine nucleosides have been useful as therapeutic agents and their effect on the structure and activity of oligonucleotides may be examined using the 2’-OMe-RNA derivatives. The 2,4,6-trimethylphenyl (TMP) protected 2’-OMe-U derivative is a convertible nucleoside and reaction with ammonia leads to the 5-fluoro-dC analogue. 2’-OMe-3-deaza-5-aza-C (Reverse C) derivative has the potential to mimic in oligonucleotides 5-azacytidine, a DNA methylase inhibitor. Its ability to bind as a C will likely be diminished.

ABI-style vials are supplied unless otherwise requested (see note box).