Postsynthetic On-Column 2' Functionalization of RNA by Convenient Versatile Method.

International Journal of Molecular Sciences
Olga A KrashenininaAlya G Venyaminova

Abstract

We report a universal straightforward strategy for the chemical synthesis of modified oligoribonucleotides containing functional groups of different structures at the 2' position of ribose. The on-column synthetic concept is based on the incorporation of two types of commercial nucleotide phosphoramidites containing orthogonal 2'-O-protecting groups, namely 2'-O-thiomorpholine-carbothioate (TC, as "permanent") and 2'-O-tert-butyl(dimethyl)silyl (tBDMS, as "temporary"), to RNA during solid-phase synthesis. Subsequently, the support-bound RNA undergoes selective deprotection and follows postsynthetic 2' functionalization of the naked hydroxyl group. This convenient method to tailor RNA, utilizing the advantages of solid phase approaches, gives an opportunity to introduce site-specifically a wide range of linkers and functional groups. By this strategy, a series of RNAs containing diverse 2' functionalities were synthesized and studied with respect to their physicochemical properties.

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Methods Mentioned

BETA
acylation
circular dichroism
acetylation
NMR
transfection
flow cytometry
fluorescence microscopy

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