Kosman J, Stanislawska A, Gluszynska A, Juskowiak B. Conjugation of hemin to G-quadruplex forming oligonucleotide using click chemistry.
Int J Biol Macromol 2017;
101:799-804. [PMID:
28366862 DOI:
10.1016/j.ijbiomac.2017.03.170]
[Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Revised: 03/28/2017] [Accepted: 03/29/2017] [Indexed: 11/16/2022]
Abstract
Peroxidase-mimicking DNAzyme is one of the systems that recently gained a great interest. It has been successfully applied for designing numerous bioassays. The success of this system is connected to its advantages over a protein enzyme, horseradish peroxidase. Promising strategy for further improvement of performance of DNAzyme with peroxidase-like activity was proposed recently. It was based on the covalent attachment of hemin moiety to the G-quadruplex scaffold. We report here the first attempt of conjugating hemin to the G-quadruplex DNA using click chemistry approach. We modified hemin molecule through attachment of an azide-terminated linker to the porphyrin carboxylic group. Two click chemistry approaches were examined to conjugate the azide-modified hemin to a G-quadruplex oligonucleotide: copper-catalyzed and Cu-free cycloaddition reactions. Using Cu-free click reaction, we successfully synthesized G-quadruplex-hemin conjugate that exhibited promising peroxidase activity.
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