Opposite salt-dependent stability of i-motif and duplex reflected in a single DNA hairpin nanomachine
Abstract
We herein report a DNA hairpin structure containing a polycytosine loop region, and this hairpin can operate like a nanomachine allowing independently controlled stability of the i-motif loop and duplex stem region. This was made possible by the opposite salt-dependent stability of DNA duplex and hairpin, thus providing a new method for designing molecular devices or switches design. A singly-labeled fluorescent method was used to measure the stability of an i-motif DNA in the presence of various metal ions. Salt in general destabilizes the i-motif but stabilizes duplex DNA, allowing us to engineer an i-motif containing hairpin for modulating the stability of each secondary structure independently.
- Publication:
-
Nanotechnology
- Pub Date:
- May 2020
- DOI:
- 10.1088/1361-6528/ab6fdf
- Bibcode:
- 2020Nanot..31s5503Z
- Keywords:
-
- DNA;
- nanomachine;
- metal ions;
- fluorescence;
- biosensors