1. Folding‐upon‐Repair DNA Nanoswitches for Monitoring the Activity of DNA Repair Enzymes
- Author
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Rosanna Mattossovich, Francesco Ricci, Giuseppe Perugino, Nada Farag, Alessandro Porchetta, Giulia Palermo, Rosa Merlo, Łukasz Nierzwicki, Farag, Nada, Mattossovich, Rosanna, Merlo, Rosa, Nierzwicki, Łukasz, Palermo, Giulia, Porchetta, Alessandro, Perugino, Giuseppe, and Ricci, Francesco
- Subjects
Conformational change ,Fluorophore ,Methyltransferase ,DNA Repair ,DNA repair ,1.1 Normal biological development and functioning ,DNA nanoswitche ,Molecular Dynamics Simulation ,010402 general chemistry ,triplex DNA ,01 natural sciences ,Article ,Catalysis ,Nucleobase ,03 medical and health sciences ,O(6)-Methylguanine-DNA Methyltransferase ,conformational change mechanism ,chemistry.chemical_compound ,Settore CHIM/01 ,Underpinning research ,DNA nanotechnology ,Genetics ,Humans ,Nanotechnology ,030304 developmental biology ,chemistry.chemical_classification ,DNA repair enzyme ,0303 health sciences ,010405 organic chemistry ,Organic Chemistry ,DNA nanoswitches ,DNA repair enzymes ,DNA ,Nucleic Acid Conformation ,General Medicine ,General Chemistry ,0104 chemical sciences ,Enzyme ,chemistry ,Chemical Sciences ,Biophysics ,Generic health relevance ,Human - 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(6)-methyl-guanine (O(6)-MeG) nucleobases and labelled with a fluorophore/quencher optical pair. The nanoswitches are rationally designed so that only upon enzymatic demethylation of the O(6)-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.
- Published
- 2021
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