Probing and Controlling Dynamic Interactions at Biomolecule-Nanoparticle Interfaces Using Stochastic DNA Walkers.

Area of Science:

• Biotechnology
• Nanotechnology
• Molecular Biology

Background:

• Dynamic interactions at bio-nano interfaces are crucial for biosensor functionality.
• Spherical nucleic acids (SNAs) offer a platform for investigating these interactions.
• Understanding interfacial factors is key to optimizing molecular behavior at these interfaces.

Purpose of the Study:

• To develop stochastic DNA walkers for probing bio-nano interface dynamics.
• To systematically investigate the influence of various interfacial factors on molecular behavior.
• To enhance the design and operation of nanoparticle-based biosensors.

Main Methods:

• A bottom-up assembly approach for creating stochastic DNA walkers.
• Systematic investigation of interfacial factors: intramolecular interactions, orientation, cooperativity, steric effects, multivalence, and binding hindrance.
• Analysis of enzymatic behaviors at spherical nucleic acid interfaces.

Main Results:

• Identified critical roles of interfacial factors in altering molecular binding and enzymatic behaviors.
• Demonstrated significant differences in behavior at interfaces compared to bulk solutions.
• Revealed how interfacial properties impact molecular recognition and function.

Conclusions:

• Improved understanding of the bio-nano interface is essential for rational biosensor design.
• The developed DNA walkers provide a tool for mechanistic studies at bio-nano interfaces.
• This work facilitates the design of amplifiable biosensors for nucleic acids and antibodies.