Adhesive Dynamics Simulations of Highly Polyvalent DNA Motors

Area of Science:

• Synthetic biology
• Nanotechnology
• Biophysics

Background:

• Biological molecular motors like myosin and kinesin are essential for cellular functions.
• Synthetic molecular motors, particularly DNA walkers, show promise but lack speed and force generation.
• Highly polyvalent DNA motors (HPDMs) have demonstrated biological motor-like speeds and force.

Purpose of the Study:

• To investigate the relationship between HPDM design parameters and their performance (speed and force).
• To develop a simulation tool for understanding HPDM translocation dynamics.
• To guide the design of novel DNA nanotechnology-based nanomotors.

Main Methods:

• Development of RoloSim, an adhesive dynamics simulation package.
• Modeling DNA duplex formation and dissociation kinetics at the molecular level.
• Simulating tens of thousands of molecular interactions to calculate motor motion.

Main Results:

• RoloSim accurately simulates HPDM translocation, revealing dependencies of speed and force on motor size and DNA duplex length.
• Confirmed that HPDM force scales linearly with polyvalency.
• Demonstrated that HPDMs can be steered using external forces.

Conclusions:

• HPDMs represent a promising class of synthetic, force-generating nanomotors.
• RoloSim provides a powerful platform for understanding and optimizing HPDM design.
• This work offers design parameters for future HPDM-based molecular sensors and nanomachines.