A three-station DNA catenane rotary motor with controlled directionality

Area of Science:

• Nanotechnology
• Molecular Biology
• Supramolecular Chemistry

Background:

• DNA nanotechnology focuses on assembling complex molecular machines using DNA.
• Previous research has explored various DNA-based nanostructures and mechanisms.

Purpose of the Study:

• To report the development of the first DNA rotor system.
• To demonstrate controlled rotational movement of a DNA component along a track.
• To investigate the use of chemical stimuli for controlling the rotor's direction.

Main Methods:

• Construction of a DNA rotor system based on a two-ring catenane structure.
• Utilizing mercury(II) ion/cysteine (Hg(2+)/cysteine) and pH (H(+)/OH(-)) as chemical fuels and antifuels.
• Kinetic analysis to determine the population distribution and directionality of the rotor.

Main Results:

• The DNA rotor successfully rotated along a wheel track, occupying three distinct sites.
• Directional control of the rotor was achieved using chemical fuels (Hg(2+)/cysteine or pH).
• Analysis showed high population (>85%) of target sites in a specific direction (clockwise or anticlockwise), determined by the shortest path on the wheel.

Conclusions:

• The developed two-ring catenane system represents the first functional DNA rotor.
• Chemical fuels can effectively control the direction and position of the DNA rotor.
• This work provides a foundation for designing more sophisticated DNA-based nanomachines with programmable movement.