Photoswitching of DNA Hybridization Using a Molecular Motor.

Area of Science:

• Biochemistry
• Nanotechnology
• Materials Science

Background:

• Externally regulated biomacromolecules offer programmable functionality for smart materials and reduced invasive medical procedures.
• Photoswitches integrated into biomolecules like DNA have yielded significant advancements.
• Molecular motors provide precise photoregulation due to their unique switching and rotational properties.

Purpose of the Study:

• To design and synthesize a photoswitchable DNA hairpin incorporating a molecular motor as a bridgehead unit.
• To investigate the photochemical properties and structural changes induced by the molecular motor in the DNA hairpin.
• To demonstrate the light-controlled regulation of DNA duplex stability using this biohybrid system.

Main Methods:

• Design and synthesis of a photoswitchable DNA hairpin with a molecular motor bridgehead.
• Solid-phase synthesis to incorporate the motor into an 8-base-pair self-complementary DNA strand.
• Photochemical characterization and Molecular Dynamics computations to analyze system behavior.

Main Results:

• The molecular motor retained excellent photochemical properties within the DNA hairpin structure.
• Hairpin formation was not hindered by the incorporation of the motor.
• UV light irradiation induced motor rotation, leading to significant structural changes and controllable regulation of DNA duplex stability.

Conclusions:

• The developed motor-DNA hybrid system demonstrates effective photoswitchable control over DNA structure and stability.
• Molecular motors function as potent multistate switches suitable for biological environments.
• This research paves the way for advanced smart materials and light-controlled therapeutic applications.