Folding-upon-Repair DNA Nanoswitches for Monitoring the Activity of DNA Repair Enzymes

Overview

Journal Angew Chem Int Ed Engl

Specialty Chemistry

Date 2021 Jan 8

PMID 33415794

Citations 5

Authors

Nada Farag

Rosanna Mattossovich

Rosa Merlo

Lukasz Nierzwicki

Giulia Palermo

Alessandro Porchetta

Giuseppe Perugino

Francesco Ricci

Affiliations

Soon will be listed here.

Abstract

We present a new class of DNA-based nanoswitches that, upon enzymatic repair, could undergo a conformational change mechanism leading to a change in fluorescent signal. Such folding-upon-repair DNA nanoswitches are synthetic DNA sequences containing O -methyl-guanine (O -MeG) nucleobases and labelled with a fluorophore/quencher optical pair. The nanoswitches are rationally designed so that only upon enzymatic demethylation of the O -MeG nucleobases they can form stable intramolecular Hoogsteen interactions and fold into an optically active triplex DNA structure. We have first characterized the folding mechanism induced by the enzymatic repair activity through fluorescent experiments and Molecular Dynamics simulations. We then demonstrated that the folding-upon-repair DNA nanoswitches are suitable and specific substrates for different methyltransferase enzymes including the human homologue (hMGMT) and they allow the screening of novel potential methyltransferase inhibitors.

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