title: Acridine- and cholesterol-derivatized solid supports for improved synthesis of 3'-modified oligonucleotides.
abstract: New solid supports are described which allow the direct synthesis of oligonucleotides bearing either cholesterol or acridine at the 3'-terminus. A stereochemically defined amino diol was prepared by reduction of N-Cbz-hydroxy-L-proline. This linker molecule was first acylated with the desired conjugate molecule, then protected as the dimethoxytrityl ether. The remaining secondary hydroxyl group was succinylated and immobilized on a controlled-pore glass support. 3'-Modified oligodeoxynucleotides (ODNs) were prepared from these supports by using standard phosphoramidite coupling and deprotection conditions. A cholesterol-modified support was prepared from cholesterol chloroformate and the amino diol linker. Two types of acridine-modified solid supports were prepared from acridine tetrafluorophenyl esters with linker arms of different length. In an alternative synthesis of 3'-derivatized ODNs, these active esters were also utilized for acylation of a 3'-amine-modified ODN. A thermal denaturation study was done to determine the effect of the different linker arms on hybridization to a complementary ODN target. Facile synthesis and purification of the 3'-modified ODNs makes these functionalized solid supports especially useful for preparation of oligonucleotides bearing these and other modifications.
authors.affiliation: MicroProbe Corporation, Bothell, Washington 98021.
authors.forename: M W
authors.initials: MW
authors.lastname: Reed
authors.forename: A D
authors.initials: AD
authors.lastname: Adams
authors.forename: J S
authors.initials: JS
authors.lastname: Nelson
authors.forename: R B
authors.initials: RB
authors.lastname: Meyer
mesh_terms: D000166:Acridines; D001483:Base Sequence; D002625:Chemistry, Organic / Q000379:methods; D002784:Cholesterol; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D009841:Oligonucleotides / Q000737:chemistry*
chemical_list: D000166:Acridines; D009841:Oligonucleotides; D002784:Cholesterol