Synthesis of Azide-Modified Chondroitin Sulfate Precursors: Substrates for "Click"- Conjugation with Fluorescent Labels and Oligonucleotides.

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Satish Jadhav, Vijai Gulumkar, Prasannakumar Deshpande, Eleanor T. Coffey, Harri Lönnberg, Pasi Virta
Publication year: 2018
Journal: Bioconjugate Chemistry
Journal acronym: Bioconjug Chem
Volume number: 29
Issue number: 7
Start page: 2382
End page: 2393
ISSN: 1520-4812


Abstract

Azidopropyl-modified precursors of chondroitin sulfate (CS) tetrasaccharides have been synthesized, which, after facile conversion to final CS structures, may be conjugated with alkyne-modified target compounds by a one-pot "click"-ligation. RP HPLC was used for the monitoring of the key reaction steps (protecting group manipulation and sulfation) and purification of the CS precursors (as partially protected form, bearing the O-Lev, O-benzoyl, and N-trichloroacetyl groups and methyl esters). Subsequent treatments with aqueous NaOH, concentrated ammonia, and acetic anhydride (i.e., global deprotection and acetylation of the galactosamine units) converted the precursors to final CS structures. The azidopropyl group was exposed to a strain-promoted azide-alkyne cycloaddition (SPAAC) with a dibenzylcyclooctyne-modified carboxyrhodamine dye to give labeled CSs. Conjugation with a 5'-cyclooctyne-modified oligonucleotide was additionally carried out to show the applicability of the precursors for the synthesis of biomolecular hybrids.

Last updated on 2019-20-07 at 05:25